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      <title>Hardware - World of Spectrum</title>
      <link>https://worldofspectrum.org/forums/categories/hardware/p32/feed.rss</link>
      <pubDate>Mon, 22 Apr 2024 12:15:12 +0000</pubDate>
         <description>Hardware - World of Spectrum</description>
   <language>en-CA</language>
   <atom:link href="https://worldofspectrum.org/forums/categories/hardware/p32/feed.rss" rel="self" type="application/rss+xml" />
   <item>
      <title>3.4 Inch TFT with 48k Spectrum....hmmm?</title>
      <link>https://worldofspectrum.org/forums/discussion/50008/3-4-inch-tft-with-48k-spectrum-hmmm</link>
      <pubDate>Fri, 23 Jan 2015 19:51:41 +0000</pubDate>
      <dc:creator>RSwipeCA</dc:creator>
      <guid isPermaLink="false">50008@/forums/discussions</guid>
      <description><![CDATA[Hey guys,<br />
<br />
So I have been playing around with the idea of using a small LCD with composite input for a 48k Speccy.<br />
<br />
I got hold of one of these relatively cheap displays ....<br />
<br />
<a href="http://www.bestsellers2k.com/storeca/CheapCA-927726-B00CM3A3DC-43_Inch_TFT_LCD_Car_Rearview_Monitor_Screen_for_Car_Automobile.html" rel="nofollow">http://www.bestsellers2k.com/storeca/CheapCA-927726-B00CM3A3DC-43_Inch_TFT_LCD_Car_Rearview_Monitor_Screen_for_Car_Automobile.html</a><br />
<br />
It apparently has all the necessary inputs for what I need to run it with my composite modded spectrum. It does display a good picture, unfortunately the image is unstable, and acts like the 'V Hold' needs adjusting like on old CRT TV's and monitors. The picture just constantly vertically rotates from the bottom of the screen to the top, although its slow enough that you can read everything no problem. Here's a vid ..... sorry about the quality.....<br />
<br />
<a href="http://www.dropshots.com/RSwipeCA/date/2015-01-23/14:40:08" rel="nofollow">http://www.dropshots.com/RSwipeCA/date/2015-01-23/14:40:08</a><br />
<br />
It was a sub $30Cdn item, so I wasn't expecting too much picture quality wise, but it would be nice if the image stayed put. I understand these things are outside the 'normal' field of expertise here, but wondered if there is anyone who has experienced this before?<br />
<br />
Any ideas?<br />
<br />
Thanks guys.]]></description>
   </item>
   <item>
      <title>The Spectrum Resuscitation Thread</title>
      <link>https://worldofspectrum.org/forums/discussion/44400/the-spectrum-resuscitation-thread</link>
      <pubDate>Fri, 12 Jul 2013 16:25:14 +0000</pubDate>
      <dc:creator>balford</dc:creator>
      <guid isPermaLink="false">44400@/forums/discussions</guid>
      <description><![CDATA[Kicking off this thread as a place where people who are fixing/restoring Spectrums (or indeed any other piece of related hardware) can show off their work and describe any fixes implemented. Might be valuable to people like me who are just beginning to learn how to do this kind of thing well.<br />
<br />
So earlier this week I picked up this horrifically abused Issue 3:<br />
<br />
<img src="http://farm8.staticflickr.com/7355/9267774473_81439753d5_o.jpg" alt="9267774473_81439753d5_o.jpg" /><br />
<br />
What the photos don't show is that the faceplate was <i>completely</i> detached from the top cover, and somebody had made hamfisted attempts to restick it in the past with, among other things, blu-tack :-o<br />
<br />
The machine was sold as non-functional, however it powered up to the copyright message with no issues, apart from a non-functional keyboard (par for the course really) and a short boot time indicating a 16K machine. Being an issue 3, that wasn't right, so opening up revealed the following:<br />
<br />
<img src="http://farm6.staticflickr.com/5526/9270547404_641874e32f_z.jpg" alt="9270547404_641874e32f_z.jpg" /><br />
<br />
This machine had obviously been through the wars, as 6 of the 4116's were socketed as well as all of the 74LS chips (funnily enough, the replacement 4116's were soldered to the board, originals were socketed). ULA and CPU had also been replaced, along with TR4 and C46. Something tells me that a previous owner had forgotten that Speccy peripherals aren't hotswappable...<br />
<br />
Anyhow doing a 'POKE 32768,85: PRINT PEEK 32768' returned 93, so consulting the service manual:<br />
<br />
<a href="http://www.1000bit.it/support/manuali/sinclair/zxspectrum/sm/sec4_2.html#memchk" rel="nofollow">http://www.1000bit.it/support/manuali/sinclair/zxspectrum/sm/sec4_2.html#memchk</a><br />
<br />
- IC18 was revealed as the culprit, and duly replaced. The machine then initialised as a 48K, and loading/running a few 48K games verified the fix.<br />
<br />
I also took the opportunity of composite modding while I was in.<br />
<br />
After a good wash, keyboard roller and restick, and finally a quick chop of the membrane tails to get the keyboard working, here's the finished article:<br />
<br />
<img src="http://farm8.staticflickr.com/7419/9267774935_4afcec7c18_c.jpg" alt="9267774935_4afcec7c18_c.jpg" /><br />
<br />
It's still not much of a looker but much more presentable and functional than before.<br />
<br />
(And yes, I know, best practice is to replace all electrolytics, but I don't have a full set spare right now, plus it's too hot to solder extensively!)<br />
<br />
Cheers,<br />
B]]></description>
   </item>
   <item>
      <title>Spectrum +2 (Gray) Serial/MIDI Connector</title>
      <link>https://worldofspectrum.org/forums/discussion/49933/spectrum-2-gray-serial-midi-connector</link>
      <pubDate>Sat, 17 Jan 2015 17:46:29 +0000</pubDate>
      <dc:creator>theberrys</dc:creator>
      <guid isPermaLink="false">49933@/forums/discussions</guid>
      <description><![CDATA[Hi<br />
<br />
Does anyone know where I can buy the Serial Connector for my +2. I'd prefer the US but at this point across the pond would do as well.<br />
<br />
Thanks<br />
Dick Berry<br />
Albuquerque, NM USA]]></description>
   </item>
   <item>
      <title>3" fdd on Amiga</title>
      <link>https://worldofspectrum.org/forums/discussion/50191/3-fdd-on-amiga</link>
      <pubDate>Sun, 15 Feb 2015 09:12:33 +0000</pubDate>
      <dc:creator>orange</dc:creator>
      <guid isPermaLink="false">50191@/forums/discussions</guid>
      <description><![CDATA[Is there any software for reading/writing 3" diskettes  on Amiga?<br />
Presumably, old disk software wouldn't work?<br />
<br />
Thanks.]]></description>
   </item>
   <item>
      <title>Redrawn TS-1500 Schematic</title>
      <link>https://worldofspectrum.org/forums/discussion/50166/redrawn-ts-1500-schematic</link>
      <pubDate>Wed, 11 Feb 2015 16:09:17 +0000</pubDate>
      <dc:creator>theberrys</dc:creator>
      <guid isPermaLink="false">50166@/forums/discussions</guid>
      <description><![CDATA[Hi Guys<br />
<br />
I just finished the redraw of the 1500 Schematic. You can find several formats here <a href="https://onedrive.live.com/?cid=AE67FFF392766057&amp;id=AE67FFF392766057%215914" rel="nofollow">https://onedrive.live.com/?cid=AE67FFF392766057&amp;id=AE67FFF392766057%215914</a><br />
Including the source for the drawing package you can find here <a href="http://www.expresspcb.com/ExpressPCBHtm/Download.htm" rel="nofollow">http://www.expresspcb.com/ExpressPCBHtm/Download.htm</a> truly free to download. They don't even require you to give them a E-Mail Addy.<br />
<br />
Enjoy<br />
Dick<br />
New Mexico, USA]]></description>
   </item>
   <item>
      <title>This is how a DivMMC EnJOY! comes to life!</title>
      <link>https://worldofspectrum.org/forums/discussion/50134/this-is-how-a-divmmc-enjoy-comes-to-life</link>
      <pubDate>Thu, 05 Feb 2015 21:11:20 +0000</pubDate>
      <dc:creator>bverstee</dc:creator>
      <guid isPermaLink="false">50134@/forums/discussions</guid>
      <description><![CDATA[<a href="https://www.youtube.com/watch?v=XFjUFmS1XJE" rel="nofollow">https://www.youtube.com/watch?v=XFjUFmS1XJE</a>]]></description>
   </item>
   <item>
      <title>Currah Speech schematic?</title>
      <link>https://worldofspectrum.org/forums/discussion/50144/currah-speech-schematic</link>
      <pubDate>Sat, 07 Feb 2015 10:10:07 +0000</pubDate>
      <dc:creator>Korinel</dc:creator>
      <guid isPermaLink="false">50144@/forums/discussions</guid>
      <description><![CDATA[Hello all,<br />
<br />
I am curious to know how the currah unit mixed sound and RF,but I can't find a schematic.<br />
<br />
I don't suppose anyone has a schematic or knows how to open the Currah without breaking the plastic case?]]></description>
   </item>
   <item>
      <title>2n3904 equivalents</title>
      <link>https://worldofspectrum.org/forums/discussion/50138/2n3904-equivalents</link>
      <pubDate>Fri, 06 Feb 2015 16:23:22 +0000</pubDate>
      <dc:creator>Macc</dc:creator>
      <guid isPermaLink="false">50138@/forums/discussions</guid>
      <description><![CDATA[I could of sworn i had plenty of these but all im coming up with is bags of 2n2222's, im guessing these wont be drop in replacements right?<br />
<br />
This is for TR7 in a french grey +2 btw]]></description>
   </item>
   <item>
      <title>Another cause for DivIDE problems on 48K's</title>
      <link>https://worldofspectrum.org/forums/discussion/40248/another-cause-for-divide-problems-on-48k-s</link>
      <pubDate>Fri, 27 Jul 2012 10:49:59 +0000</pubDate>
      <dc:creator>bverstee</dc:creator>
      <guid isPermaLink="false">40248@/forums/discussions</guid>
      <description><![CDATA[The last months some topics were opened to discuss problems with 48K ZX Spectrums and DivIDE.<br />
<br />
Sofar we found:<br />
- Bad Z80's because of poor fanout (signal strength)<br />
- Bad Z80's because of defective M1 line<br />
- Bad PCB's or soldering contacts<br />
- Potential bad ULA's<br />
<br />
But today I found another cause: the ROM.<br />
<br />
I have an almost fully socketed board to test parts that I sell.<br />
I thought: let's check if after all this testing, a DivIDE will still work.<br />
But it didn't (boots up fine, but NMI does nothing or reset the machine).<br />
<br />
After swapping the ROM two times, I got a working one, and the DivIDE worked again.<br />
<br />
So, what's this?<br />
Are there incompatible ROM versions maybe?<br />
Or is the ROM defective, not responding to the chip select correctly??<br />
<br />
I'll read out the ROM and check differences lateron.]]></description>
   </item>
   <item>
      <title>Zx spectrum +3 disk drive</title>
      <link>https://worldofspectrum.org/forums/discussion/50111/zx-spectrum-3-disk-drive</link>
      <pubDate>Tue, 03 Feb 2015 18:42:20 +0000</pubDate>
      <dc:creator>Scoobyatgb</dc:creator>
      <guid isPermaLink="false">50111@/forums/discussions</guid>
      <description><![CDATA[Can some one tell me how too put a spectrum 3" disk drive onto a PC do you just plug it in and it will work and then how do you back up the disks that I have done]]></description>
   </item>
   <item>
      <title>New multisystem floppy interface (spectrum 16Kb/+2A/CPC464)</title>
      <link>https://worldofspectrum.org/forums/discussion/49682/new-multisystem-floppy-interface-spectrum-16kb-2a-cpc464</link>
      <pubDate>Tue, 16 Dec 2014 15:52:09 +0000</pubDate>
      <dc:creator>wilco2009</dc:creator>
      <guid isPermaLink="false">49682@/forums/discussions</guid>
      <description><![CDATA[Dear all,<br />
<br />
I would like to show you my new extern floppy interface.<br />
Same interface can be used for both, CPC and Spectrum systems.<br />
<br />
CHARACTERISTICS<br />
<br />
- Connectable to CPC 464 + Megaflash (or any other upperROM interface)<br />
- Connectable to Spectrum +2A<br />
- Connectable to Spectrum 16Kb + Superupgrade.<br />
- Supports until two floppy drives (without modifications) with a PC standard floppy drive cable.<br />
- /READY signal emulation.<br />
- Independent head selection for each floppy drive.<br />
- It is no necessary any selector to chose the system. Just take the correct cable and plug it in your computer.<br />
- One floppy drive power connector (not valid for a spectrum 16Kb due to insufficient power supply)<br />
<br />
<span>SCHEMATICS</span><br />
<br />
Below you can find the schematics of the main board (Initial version 1.03)<br />
<br />
<img src="https://lh6.googleusercontent.com/-zc_XI9aIfJY/VIjN8Q1r3HI/AAAAAAABcPI/YOK6FueR_0c/w701-h264-no/floppy_interface%2B1.03%2Bsch.png" alt="floppy_interface%2B1.03%2Bsch.png" /><br />
<a href="https://plus.google.com/u/0/photos/108544191038453053882/albums/6076692658062333025/6091344931214580850?pid=6091344931214580850&amp;oid=108544191038453053882" rel="nofollow">https://plus.google.com/u/0/photos/108544191038453053882/albums/6076692658062333025/6091344931214580850?pid=6091344931214580850&amp;oid=108544191038453053882</a><br />
<br />
GAL chip is responsible of the implementation of the comunication ports ($1FFD, $2FFD and $3FFD in spectrum) resulting in the emulation of the following signals: /MOTOR_ON, /DISK_READ y /DISK_WRITE.<br />
Previous signals are usually generated by the ULA, but are emulated in my interface to make possible the use in different systems.<br />
<br />
The head selection handle is made in the GAL chip also.<br />
<br />
The /READY signal emulation is made using the /INDEX signal coming from de floppy disk, /MOTORON signal and a 555 timer.<br />
<br />
The schematic for the /READY emulation is:<br />
<br />
<img src="https://lh3.googleusercontent.com/-8ZGtIxwYQio/VIdSjTxVWFI/AAAAAAABcOA/Z-sG8CX_mtM/w702-h357-no/ready_sim_sch.png" alt="ready_sim_sch.png" /><br />
<a href="https://plus.google.com/u/0/photos/108544191038453053882/albums/6076692658062333025/6090927787597977682?pid=6090927787597977682&amp;oid=108544191038453053882" rel="nofollow">https://plus.google.com/u/0/photos/108544191038453053882/albums/6076692658062333025/6090927787597977682?pid=6090927787597977682&amp;oid=108544191038453053882</a><br />
<br />
The emulation is made, keeping low during some time the /READY after /MOTORON signal is low, and after that the /READY signal will continues low while a /INDEX pulse is periodically present.<br />
<br />
If the /INDEX pulse disappears you will get "Unit not ready" message.<br />
<br />
/READY emulation can be activated/Deactivated with a jumper.<br />
<br />
<span>BOARDS</span><br />
<br />
This is the main board:<br />
<br />
<a href="https://plus.google.com/u/0/photos/108544191038453053882/albums/6076692658062333025/6091344933860382914?pid=6091344933860382914&amp;oid=108544191038453053882" rel="nofollow"><img src="https://lh5.googleusercontent.com/-fCXJRp7xF6w/VIjN8asfmMI/AAAAAAABcPA/YxL8uD6Lar4/w702-h330-no/floppy_interface%2B1.03%2Bbrd.png" alt="floppy_interface%2B1.03%2Bbrd.png" /></a><br />
<br />
Auxiliar board to connect a Spectrum:<br />
<br />
<img src="https://lh6.googleusercontent.com/-iH9Jf6OD89M/VHnqjbMS2sI/AAAAAAABcBU/QkWmlgmg6DA/w503-h282-no/CONECTOR%2BSPECTRUM.png" alt="CONECTOR%2BSPECTRUM.png" /><br />
<br />
Auxiliar board to connect a CPC:<br />
<br />
<img src="https://lh5.googleusercontent.com/-1yjjojMQV0I/VHnql_VoEZI/AAAAAAABcBc/JpWlUL4HkbM/w428-h252-no/CONECTOR%2BCPC%2B1.1.png" alt="CONECTOR%2BCPC%2B1.1.png" /><br />
<br />
The interface has been tested as a prototype we will have a short batch of kits in format "assemble it your self" in a couple of months.]]></description>
   </item>
   <item>
      <title>Finally got round to it</title>
      <link>https://worldofspectrum.org/forums/discussion/50105/finally-got-round-to-it</link>
      <pubDate>Tue, 03 Feb 2015 13:23:49 +0000</pubDate>
      <dc:creator>woollymammoth</dc:creator>
      <guid isPermaLink="false">50105@/forums/discussions</guid>
      <description><![CDATA[Finally got round to giving my old speccy a close look.<br />
<br />
Details 1982 Issue 2<br />
Seriel No 001 196193<br />
<br />
Hmm...<br />
<br />
Followed the initial tests on You tube which were excellent and got the following results.<br />
<br />
Voltage Reg, maxed out at 75 ohm, class that as a fail then<br />
<br />
Lower ram tested on 200Kohm range<br />
<br />
O volt rail
<hr />
0<br />
+5 volt rail----0.8<br />
-5 volt rail----80.1<br />
<br />
Tested on 2K range<br />
<br />
+12 volt rail---850 ohm
<hr />
IC2 as the usual patch however IC 26 as a patch, is this usual ?<br />
<br />
IC 23 to IC 26, IC1, IC5 socketed but not IC 3 and 4 ?<br />
Upper ram socketed<br />
<br />
Any comments gratefully recieved]]></description>
   </item>
   <item>
      <title>What influence the number of stripes during initialization?</title>
      <link>https://worldofspectrum.org/forums/discussion/50115/what-influence-the-number-of-stripes-during-initialization</link>
      <pubDate>Tue, 03 Feb 2015 21:28:35 +0000</pubDate>
      <dc:creator>jimre</dc:creator>
      <guid isPermaLink="false">50115@/forums/discussions</guid>
      <description><![CDATA[Hi for All! After some adventures, with other rare old computers I'm back here to my favourite forum. :)<br />
<br />
Recently I got some ISSUE 2 boards from Ben. As the ZX Spectrum is powered up black and white stripes are displayed for a moment. On most of my machines the screen divided into eight stripes:<br />
<img src="http://gigant.chem.elte.hu/ZXSpectrum/Initialization_ISSUE2/ISSUE2_eight_stripes.jpg" alt="ISSUE2_eight_stripes.jpg" /><br />
On old ISSUE 1 machines I have seen that there are only four stripes. One of the ISSUE 2 boards initializes also that way:<br />
<img src="http://gigant.chem.elte.hu/ZXSpectrum/Initialization_ISSUE2/ISSUE2_four_stripes.jpg" alt="ISSUE2_four_stripes.jpg" /><br />
I thought that it depends on the ULA type, but there are two boards, which have the same 5C112E-3 ULA (dated 8314). One shows four stripes, the other shows eight. As I exchanged the ULA between the boards the number of stripes remained the same on the same board, so my "ULA dependence theory" seems to be wrong. Both boards have NEC CPU, first has NEC, the second Hitachi ROM. The RAM chips are different: NEC and ITT 4116 chips were used.<br />
<br />
I'm very curios what influence the pattern displayed! Has somebody an idea on that? Thank you!]]></description>
   </item>
   <item>
      <title>Spectrum +2 (grey) RAM issue</title>
      <link>https://worldofspectrum.org/forums/discussion/50090/spectrum-2-grey-ram-issue</link>
      <pubDate>Sun, 01 Feb 2015 18:22:43 +0000</pubDate>
      <dc:creator>CRNorris</dc:creator>
      <guid isPermaLink="false">50090@/forums/discussions</guid>
      <description><![CDATA[Hi,<br />
<br />
I?ve got a ZX Spectrum +2 (grey) with what I think is a RAM issue.<br />
<br />
I used to be able to load games very reliably by playing converted TAPs and TZXs through tapDancer on my phone, connected to a car cassette adapter. Lately it almost always ends up with an R Tape Loading Error. I quickly got fed up with that so I bought a Divide2k14 from Lotharek?s Lair.<br />
<br />
Included with that device is a 128K RAM test firmware.<br />
<br />
When I run the test, the screen border colour changes and when it gets to cyan, coloured vertical stripes appear, which according to the manual (<a href="http://lotharek.pl/zasoby/produkty/128/pliki/divide_2k14.pdf" rel="nofollow">http://lotharek.pl/zasoby/produkty/128/pliki/divide_2k14.pdf</a>, page 4) means that RAM page 5 has an issue.<br />
<br />
Here?s a video: <a href="https://www.dropbox.com/sc/orzfxgbq9jumrkd/AACZdrgl3rfgxY0rESSw3B2za" rel="nofollow">https://www.dropbox.com/sc/orzfxgbq9jumrkd/AACZdrgl3rfgxY0rESSw3B2za</a><br />
<br />
From what I understand, I need to swap the broken chip for a working one. And presumably others could be broken as well since the test doesn?t seem to be able to locate further problems after finding one.<br />
<br />
I checked out the service manual and I think this is a suitable replacement: <a href="http://www.mutant-caterpillar.co.uk/shop/product_info.php?cPath=101&amp;products_id=3502" rel="nofollow">http://www.mutant-caterpillar.co.uk/shop/product_info.php?cPath=101&amp;products_id=3502</a><br />
<br />
I have ordered and received two of those (though I may only need one).<br />
<br />
Also since I?m going to be messing around inside the computer is there anything else I ought to do at the same time? It's an Issue 3 PCB.<br />
<br />
<i><br />
<br />
I should say that when loading games from the Divide2k14, they have all worked perfectly so far (seemingly), was that just luck?<br />
<br />
Finally, how do I tell which chip on the PCB is for which RAM page?<br />
<br />
I?m new to doing something other than play games with microcomputers so apologies if I said something daft.<br />
<br />
Thanks!</i>]]></description>
   </item>
   <item>
      <title>Interface 1bis RAM Drive modification</title>
      <link>https://worldofspectrum.org/forums/discussion/49070/interface-1bis-ram-drive-modification</link>
      <pubDate>Tue, 14 Oct 2014 19:05:25 +0000</pubDate>
      <dc:creator>Pierre</dc:creator>
      <guid isPermaLink="false">49070@/forums/discussions</guid>
      <description><![CDATA[All Interface 1bis users<br />
<br />
I hope I am not interfering with Dan, but I saw on his site that he has a RAM Drive upgrade/modification for the Interface 1bis . To have an on-board 128K RAM drive, the user must install a memory chip (23LCV1024-I/SN) and also a wire link is required to provide back-up battery power. This will act as a new drive on the system, device "r". This is in addition to the SD card and PC as file server.<br />
<br />
Dan also changed the firmware so that the user can use his PC keyboard via the USB port as an input device for the Spectrum.<br />
<br />
Well done Dan, you always come out with nice additions/modifications. I think only the LAN interface is now outstanding, although you can go through the PC.<br />
<br />
<a href="https://sites.google.com/site/interface1bis/updates" rel="nofollow">https://sites.google.com/site/interface1bis/updates</a><br />
<br />
I just need to get the memory chip now from RS in JHB.<br />
<br />
Pierre]]></description>
   </item>
   <item>
      <title>Spectranet + Interface 1?</title>
      <link>https://worldofspectrum.org/forums/discussion/50089/spectranet-interface-1</link>
      <pubDate>Sun, 01 Feb 2015 15:40:02 +0000</pubDate>
      <dc:creator>Wrangler</dc:creator>
      <guid isPermaLink="false">50089@/forums/discussions</guid>
      <description><![CDATA[Hi all!<br />
<br />
I'm having fun with that work of art, the Spectranet.  But I can't get it to play nice with an Interface 1 even though that is stated to be one of the project aims.<br />
<br />
If I connect both of these to a real Spectrum (48k) - IF1 first, then Spectranet - I am unable to use either interface.  Eg a command like %cat just returns 0 OK 0:1 without actually doing anything and the same thing happens if I do CAT 1 - no mdv access, just 0 OK 0:1.  In fact, any random command returns 0 OK 0:1 eg %foobar.  Seems like all that happens is that the syntax checking is turned off. :confused:<br />
<br />
If I connect the Spectranet first, then the IF1 (a weird set up) then the Spectranet commands work properly but the Interface 1 commands are not recognised at all: the syntax checker rejects CAT 1 for example.<br />
<br />
I'd really like to get this combination working but clearly something's not right.  Anyone any ideas what I can do to fix it?<br />
<br />
Cheers!<br />
<br />
Matthew]]></description>
   </item>
   <item>
      <title>Betadisk 128 in production.</title>
      <link>https://worldofspectrum.org/forums/discussion/49011/betadisk-128-in-production</link>
      <pubDate>Wed, 08 Oct 2014 16:47:48 +0000</pubDate>
      <dc:creator>zaxon</dc:creator>
      <guid isPermaLink="false">49011@/forums/discussions</guid>
      <description><![CDATA[Pcb is in factory, i expect ready device in next 2 weeks.<br />
<br />
<a href="http://www.fotosik.pl/showFullSize.php?id=7b4cc1b97c1c4703" rel="nofollow"><img src="http://images52.fotosik.pl/508/7b4cc1b97c1c4703m.jpg" alt="7b4cc1b97c1c4703m.jpg" /></a>]]></description>
   </item>
   <item>
      <title>Guess the video fault</title>
      <link>https://worldofspectrum.org/forums/discussion/50073/guess-the-video-fault</link>
      <pubDate>Sat, 31 Jan 2015 00:49:27 +0000</pubDate>
      <dc:creator>brownb2</dc:creator>
      <guid isPermaLink="false">50073@/forums/discussions</guid>
      <description><![CDATA[I've two dead flesh Spectrums, one a 16K issue 2 outputting white with a tinge of blue (not as extreme as photo shows) with two pink horizontal lines and a 48K issue 4s outputting white as pink with blue/green interference.<br />
<br />
Both have composite mods done by me to attempt to rule out RF problems. Can anyone tell me what is wrong? Is either a caps fault?<br />
<br />
16k:<br />
<img src="http://lh6.googleusercontent.com/-XcMq09PPmS8/VMwltn2LMrI/AAAAAAAADMA/QNXMNszYBEA/s800/IMG_20150131_003431.jpg" alt="IMG_20150131_003431.jpg" /><br />
48k:<br />
<img src="http://lh6.googleusercontent.com/-x8CFUK_3JcI/VMwlos1_-DI/AAAAAAAADL4/mxinI9ZDL4Y/s800/IMG_20150131_003506.jpg" alt="IMG_20150131_003506.jpg" />]]></description>
   </item>
   <item>
      <title>Spectrum preservation/clean up questions.</title>
      <link>https://worldofspectrum.org/forums/discussion/49303/spectrum-preservation-clean-up-questions</link>
      <pubDate>Wed, 05 Nov 2014 15:20:39 +0000</pubDate>
      <dc:creator>Korinel</dc:creator>
      <guid isPermaLink="false">49303@/forums/discussions</guid>
      <description><![CDATA[I&#8217;m sorting out my 5 Spectrums trying to make them look a bit better, and to package them up how they should be, and to get them to be reliable for a few more years, so I would love some advice on how to care for them:<br />
<br />
[1] Two of my +s have very yellow keys, and one is really nice and white, can anyone recommend what to use/do to clean them up without causing any damage?<br />
<br />
[2] Same question regarding the rubber mat for the 48K &amp; 16K Spectrums, am I able to just chuck it in hot soapy water?<br />
<br />
[3] What&#8217;s the best way to remove stickers and their residue from Spectrums?<br />
<br />
[4] Is it easy and non-risky to say remove the keys themselves off a Spectrum+ to pop on a dirty toast rack?<br />
<br />
[5] Regarding toast rack, do RBG/Ear -&gt; SCART cables wear out the ULA?<br />
<br />
[6] Feet, I have missing feet from the rubber Spectrums (rectangle black), Microdrive&#8217;s (rectangle), the pluses (round ones) and the power supplies (round and square ones), is there a way remake them, as buying them from ebay seems rather expensive?<br />
<br />
[7] All my Spectrum modulators and heat sinks have a sticky brown patch on, what was this, how do I remove it and what should I use to put back?<br />
<br />
[8] My toast rack has no cap on the modulator which is odd, but I&#8217;ve seen this before on a +128K, is this normal or should they always have a cap? Does a cap from 48K + fit?<br />
<br />
[9] Has anyone ever done an inventory of what came inside each ZX Spectrum box?, e.g. I&#8217;m trying to work out what I have missing from my Spectrums but generally I don't have a complete understanding of what was inside!<br />
<br />
[10] My 48K+ for some reason has a PSU from a toast rack is this okay to use, I assume it is, I&#8217;ve been using every day for the last year but only noticed last night! &#61514;<br />
<br />
[11] Is it advisable to change the capacitors on all makes and models of ZX Spectrums?<br />
<br />
[12] Is there anything else that should be changed on the Spectrums?<br />
<br />
[13] I can't find an RS232 for a Spectrum+ 128 (toast rack) that I can use to connect to a PC, has anyone any advice on what to use to connect the two?<br />
<br />
[14] Is it possible to by "new" joysticks for Spectrums, I don't really want to buy a second hand ones as tend to be worn :(<br />
<br />
[15] Is It possible to still buy 48K upgrades for 16K Spectrums, if so can someone recommend where from?]]></description>
   </item>
   <item>
      <title>48k noise problem..</title>
      <link>https://worldofspectrum.org/forums/discussion/50043/48k-noise-problem</link>
      <pubDate>Mon, 26 Jan 2015 16:58:20 +0000</pubDate>
      <dc:creator>GameBaddie</dc:creator>
      <guid isPermaLink="false">50043@/forums/discussions</guid>
      <description><![CDATA[Hi guys, I need some hardware advice with my old 48k.<br />
<br />
The machine is VERY noisy - I've fixed the video noise by performing the 'composite' mod, but the audio is still very bad.<br />
In fact, it won't allow me to save my programs, as I just get 'tape error' messages when loading them.<br />
BTW - I'm using my PC with an expensive soundcard, and NOT a rusty old tape recorder. . . There's no problem with my souncard &amp; Mixing desk.<br />
<br />
<br />
I'm sure this is a common fault with these old machines, so what is the solution?<br />
<br />
Thanks gents :)]]></description>
   </item>
   <item>
      <title>128K RAM tester as .TAP?</title>
      <link>https://worldofspectrum.org/forums/discussion/50000/128k-ram-tester-as-tap</link>
      <pubDate>Fri, 23 Jan 2015 06:14:09 +0000</pubDate>
      <dc:creator>bverstee</dc:creator>
      <guid isPermaLink="false">50000@/forums/discussions</guid>
      <description><![CDATA[I was sure that I've seen a RAM tester that can be loaded with e.g. DivIDE or DivMMC EnJOY! as .TAP.<br />
But I can't find it (been searching through the forums); anyone have an idea if it's available?<br />
<br />
Of course something like this can only be used on 128K machines, and if lower RAM works fine, and there is only a small error in upper RAM.<br />
<br />
I have a diag ROM myself, but this is for someone else.]]></description>
   </item>
   <item>
      <title>ZX81 ULA Swap question</title>
      <link>https://worldofspectrum.org/forums/discussion/50030/zx81-ula-swap-question</link>
      <pubDate>Sun, 25 Jan 2015 20:18:00 +0000</pubDate>
      <dc:creator>memrah</dc:creator>
      <guid isPermaLink="false">50030@/forums/discussions</guid>
      <description><![CDATA[Hi<br />
<br />
Can someone remind me if all three versions of the ZX81 ULA are electrically compatible? I just bought a ZX81 with an older ULA, so it lacks the backporch signal, thus producing a dark/dim image on my television. I happen to have a good ULA 2C210E. Can I simply swap it with the old one without any other hardware modifications? I almost remember doing something similar in the past to my first ZX81 but it has been years and I am not 100% sure about whether there was any other hardware modification required.<br />
Thank you :)]]></description>
   </item>
   <item>
      <title>Joystick, resistor oddity.</title>
      <link>https://worldofspectrum.org/forums/discussion/50018/joystick-resistor-oddity</link>
      <pubDate>Sat, 24 Jan 2015 17:26:55 +0000</pubDate>
      <dc:creator>Korinel</dc:creator>
      <guid isPermaLink="false">50018@/forums/discussions</guid>
      <description><![CDATA[Hello all, I bought a joystick off eBay and the left direction didn't work, I opened it up and there was a 470 ohm resistor on the left wire close to the contact pad.<br />
<br />
I assumed it had blown so replaced it but still it didn't work to the left, so took the resistor off and reconnected it all up, now it works fine. None of the other fires and directions had resistors attached.<br />
<br />
So I am now curious, does anyone have any idea why it would have the resistor attached just on the left?<br />
<br />
The joystick is a Cheetah 125+, it has both the black and grey 9 pin connectors, I only was using the default black ones.]]></description>
   </item>
   <item>
      <title>ZX Spectrum+ mock-up...</title>
      <link>https://worldofspectrum.org/forums/discussion/50020/zx-spectrum-mock-up</link>
      <pubDate>Sat, 24 Jan 2015 22:48:01 +0000</pubDate>
      <dc:creator>QLvsJAGUAR</dc:creator>
      <guid isPermaLink="false">50020@/forums/discussions</guid>
      <description><![CDATA[Hi folks,<br />
<br />
I've acquired from the Tedeschi family the ZX Spectrum+ mock-up of the Sinclair archives. Did unpack the parcel today and shot some photos. See:<br />
<a href="https://onedrive.live.com/?cid=C250D8748980CE5A&amp;id=C250D8748980CE5A%215499" rel="nofollow">https://onedrive.live.com/?cid=C250D8748980CE5A&amp;id=C250D8748980CE5A%215499</a><br />
<br />
Cheers,Urs]]></description>
   </item>
   <item>
      <title>Zx spectrum interface 1</title>
      <link>https://worldofspectrum.org/forums/discussion/49947/zx-spectrum-interface-1</link>
      <pubDate>Sun, 18 Jan 2015 18:46:15 +0000</pubDate>
      <dc:creator>Scoobyatgb</dc:creator>
      <guid isPermaLink="false">49947@/forums/discussions</guid>
      <description><![CDATA[Could some one help me I have a interface 1 and need too know the two screw sizes that go into though the interface 1 and into the spectrum and the type of screw they are<br />
<br />
Thanks]]></description>
   </item>
   <item>
      <title>Issue Two 16K doesn?t like any keyboard</title>
      <link>https://worldofspectrum.org/forums/discussion/49994/issue-two-16k-doesn-t-like-any-keyboard</link>
      <pubDate>Thu, 22 Jan 2015 19:13:38 +0000</pubDate>
      <dc:creator>schombi</dc:creator>
      <guid isPermaLink="false">49994@/forums/discussions</guid>
      <description><![CDATA[I have a strange Issue Two 16K Spectrum here, that doesn?t like any keyboard. With the original keyboard fitted, it boots, but no key works. Okay, I thought it?s the membrane, so I used Bens PC keyboard interface. With this interface fitted, the Spectrum doesn?t boot, shows random colors, garbage on the screen etc. For test reasons I installed a +keyboard. Now the Spectrum boots again, but also not a single key working. What could be wrong?]]></description>
   </item>
   <item>
      <title>DivMMC Enjoy! Works on 3 of 4 48k Speccy's I own?</title>
      <link>https://worldofspectrum.org/forums/discussion/49989/divmmc-enjoy-works-on-3-of-4-48k-speccy-s-i-own</link>
      <pubDate>Wed, 21 Jan 2015 22:57:44 +0000</pubDate>
      <dc:creator>RSwipeCA</dc:creator>
      <guid isPermaLink="false">49989@/forums/discussions</guid>
      <description><![CDATA[Hey guys.<br />
<br />
I have a DivMMC Enjoy! Which is absolutely awesome! Love it to bits. It works perfect on three of my 48k Speccy's, but something isn't right with the fourth speccy.<br />
<br />
If I plug it into my issue 4S Plus motherboard, the Power light on the DivMMC lights up, but there is no sign of memory card access - the blue CARD LED doesn't even flicker upon power up? Pressing the NMI button just resets the speccy back to the Sinclair Research prompt rather than load the file screen.<br />
<br />
This particular 4S works normally otherwise as far as I can tell. I wonder if the DivMMC is getting all the correct voltages/comms etc from the speccy's edge connector?<br />
<br />
Any ideas guys?<br />
<br />
<a href="http://www.dropshots.com/RSwipeCA/date/2015-01-21/17:57:32" rel="nofollow">http://www.dropshots.com/RSwipeCA/date/2015-01-21/17:57:32</a>]]></description>
   </item>
   <item>
      <title>Newbie with a fault</title>
      <link>https://worldofspectrum.org/forums/discussion/49952/newbie-with-a-fault</link>
      <pubDate>Sun, 18 Jan 2015 22:16:34 +0000</pubDate>
      <dc:creator>Boogie-time</dc:creator>
      <guid isPermaLink="false">49952@/forums/discussions</guid>
      <description><![CDATA[Hi all just joined after digging my spectrum out of the loft after 30 years, it was put up there because it had a common fault I remember from back in the day which was the multicolored blocks all over the screen , some sort of video problem I assume, could anyone give me some pointers (guides info etc) as to how I can fix this, I can solder a bit, but I'm not great, I've had a quick look on the site but cant see anything related, I'm sure this is a common fault.<br />
Many thanks. btw its a rubber faced 48k, its serial is 001-554517.<br />
<br />
Dave]]></description>
   </item>
   <item>
      <title>Strange keyboard port reads on 48+</title>
      <link>https://worldofspectrum.org/forums/discussion/49945/strange-keyboard-port-reads-on-48</link>
      <pubDate>Sun, 18 Jan 2015 17:52:30 +0000</pubDate>
      <dc:creator>ub880d</dc:creator>
      <guid isPermaLink="false">49945@/forums/discussions</guid>
      <description><![CDATA[Hi all,<br />
<br />
I don't know whether it was already discussed (I also searched forum, but there are too much of results searching "48k keyboard" so I didn't checked them all). If it was discussed, can somebody point me to that thread?<br />
<br />
The problem is as follows:<br />
<br />
When I press CAPS+9 on 48k+ keyboard and read port EFFE (keys 6-0) I get value as if there are pressed two keys: 9 and also 0. But it is more strange than that, as it looks like it depends also on address where is the program reading port as on some addresses it causes this wrong reads and on some addresses it reads only key 9 as it should.<br />
<br />
I asked a friend to test it on other zx models and it looks like standard "gummy" zx is not affected by this and zx spectrum +2 (grey) is also affected. Also it seems it is some problem of two layered keyboard membranes.<br />
<br />
Can you also try it on your speccy? Did someone already spotted this behavior? Where could be the problem? Is it how are designed traces on two layered membranes (do anyone have picture with colored traces on zx+ membrane, i googled it and found only "gummy" membrane here: <a href="http://www.kameli.net/marq/?p=2055" rel="nofollow">http://www.kameli.net/marq/?p=2055</a>).<br />
<br />
I created simple test program, which repeatedly reads port EFFE (on different addresses) and if it detects keys 9 and 0 both pressed it returns with address of 'in' instruction which reads key 0 pressed and this address is then printed to the screen by basic program and test is executed again.<br />
<br />
BASIC part:
<pre>10 INK 7: PAPER 0: BORDER 0: CLS
20 CLEAR 32767
30 LOAD &quot;&quot;CODE 32768
40 POKE 23692,255: PRINT USR 32768;&quot;   &quot;;: GO TO 40
</pre>
ASM part:
<pre>cpu     z80undoc
                relaxed on

                org     32768
                di
                call    test
                ei
                ret
test
loop
                rept    3270
                ld      bc,+
                ld      a,239
+               in      a,(254)
                and     3
                ret     z
                endm
                jp      loop
</pre>
<br />
compiled tap can be downloaded <a href="http://sindik.at/~ub880d/tmp/kbd.tap" rel="nofollow">here</a> .]]></description>
   </item>
   <item>
      <title>I am looking for a Spectrum doctor screener</title>
      <link>https://worldofspectrum.org/forums/discussion/49960/i-am-looking-for-a-spectrum-doctor-screener</link>
      <pubDate>Mon, 19 Jan 2015 14:22:48 +0000</pubDate>
      <dc:creator>flopping</dc:creator>
      <guid isPermaLink="false">49960@/forums/discussions</guid>
      <description><![CDATA[I am looking for this interface or i need to get the circuit inside with eprom program (inside too).<br />
<br />
<img src="https://lh3.googleusercontent.com/-aaHMWvrtr00/VL0RZ6Cms6I/AAAAAAAASBI/qaY5_5dNvgA/w464-h348-no/P1100754.jpg" alt="P1100754.jpg" /><br />
<br />
<img src="https://lh6.googleusercontent.com/-4PdBUsqUkkI/VL0RZ4INhGI/AAAAAAAASBE/0EXe4sRmVUY/w464-h348-no/P1100755.jpg" alt="P1100755.jpg" /><br />
<br />
<img src="https://lh6.googleusercontent.com/-9LcHSUiNMTA/VL0RZ9DxQGI/AAAAAAAASBQ/qQrjYh565TM/w464-h348-no/P1100756.jpg" alt="P1100756.jpg" /><br />
<br />
<img src="https://lh4.googleusercontent.com/-SaMkeoyfT4I/VL0RayRbJAI/AAAAAAAASBM/YY8BSsaUUzY/w464-h348-no/P1100757.jpg" alt="P1100757.jpg" />]]></description>
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