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      <title>Hardware - World of Spectrum</title>
      <link>https://worldofspectrum.org/forums/categories/hardware/p33/feed.rss</link>
      <pubDate>Mon, 22 Apr 2024 12:15:13 +0000</pubDate>
         <description>Hardware - World of Spectrum</description>
   <language>en-CA</language>
   <atom:link href="https://worldofspectrum.org/forums/categories/hardware/p33/feed.rss" rel="self" type="application/rss+xml" />
   <item>
      <title>Spectrum Doctor Screenex</title>
      <link>https://worldofspectrum.org/forums/discussion/49827/spectrum-doctor-screenex</link>
      <pubDate>Sun, 04 Jan 2015 23:34:06 +0000</pubDate>
      <dc:creator>flopping</dc:creator>
      <guid isPermaLink="false">49827@/forums/discussions</guid>
      <description><![CDATA[Does anybody knows this interface or knows what is inside it?<br />
<br />
<img src="http://i198.photobucket.com/albums/aa47/Vivien71_2007/P1100754.jpg" alt="P1100754.jpg" /><br />
<br />
<img src="http://i198.photobucket.com/albums/aa47/Vivien71_2007/P1100755.jpg" alt="P1100755.jpg" /><br />
<br />
<img src="http://i198.photobucket.com/albums/aa47/Vivien71_2007/P1100756.jpg" alt="P1100756.jpg" /><br />
<br />
<img src="http://i198.photobucket.com/albums/aa47/Vivien71_2007/P1100757.jpg" alt="P1100757.jpg" />]]></description>
   </item>
   <item>
      <title>Joytsick Interface damaged Spectrum</title>
      <link>https://worldofspectrum.org/forums/discussion/49913/joytsick-interface-damaged-spectrum</link>
      <pubDate>Thu, 15 Jan 2015 20:49:36 +0000</pubDate>
      <dc:creator>Korinel</dc:creator>
      <guid isPermaLink="false">49913@/forums/discussions</guid>
      <description><![CDATA[Hello All,<br />
<br />
Sob.. I am a plonker, I did the cardinal sin, I was testing a bunch of joystick interfaces that I got off ebay and one didn't have the keyway and now I don't have a working Spectrum 48K+ (6A)!<br />
<br />
I get a black screen, border and inner, but I checked the ULA and it's fine.<br />
<br />
The voltages on the lower RAM are not correct, it appears I have lost -5v and +12v. Does this mean the lower DRAM is now toast?<br />
<br />
My coil has some modification (done prior to me owning the board) to it so I'm not sure how to test it. Basically under the board there's a resistor linking the two outer pins of the coil. A second modification goes to R61 from the bottom inner pin of the coil. Does anyone know what this is?<br />
<br />
Using a MM and testing TR 4 I'm getting 6 and 1193 on the legs (+ in middle) and 0 and 693 (- in middle).<br />
<br />
For TR5 I'm getting 778 and 776 on the outer legs (- middle) and 1515 and open circuit (+ middle).<br />
<br />
So I assume TR4 is toast but TR5 is okay?<br />
<br />
Is there anything else I should check?<br />
<br />
I should be put in stocks for a week and everyone throw rotten fruit and veg at me! I can't believe I did this!]]></description>
   </item>
   <item>
      <title>problems with a 48k</title>
      <link>https://worldofspectrum.org/forums/discussion/49878/problems-with-a-48k</link>
      <pubDate>Sun, 11 Jan 2015 21:28:50 +0000</pubDate>
      <dc:creator>a_motorized_peach</dc:creator>
      <guid isPermaLink="false">49878@/forums/discussions</guid>
      <description><![CDATA[<a href="http://imgur.com/lpGfjik" rel="nofollow">http://imgur.com/lpGfjik</a><br />
<br />
Hi WOS. Its my first post here. I have know about this site for a quite good time, but didnt had the will to contact you.<br />
I dont know much about computers, nor im a technician. But i think the rf output has a problem. I also heard a high pitched and grainy sound when the spectrum is turned on<br />
<br />
I would like to see this machine alive. But i cant do much]]></description>
   </item>
   <item>
      <title>Once again, fixing the +3 sound</title>
      <link>https://worldofspectrum.org/forums/discussion/49922/once-again-fixing-the-3-sound</link>
      <pubDate>Fri, 16 Jan 2015 18:16:04 +0000</pubDate>
      <dc:creator>schombi</dc:creator>
      <guid isPermaLink="false">49922@/forums/discussions</guid>
      <description><![CDATA[One more question about fixing the distorted +3 sound. The longer you search the internet, the more suggestions you find. They?re all different, but, beside from installing a stereo mod, they all require some resistors to be removed, added and tracks to be cut. This description<br />
<a href="http://home.amis.net/mambroz/misc/plus3soundfix.htm" rel="nofollow">http://home.amis.net/mambroz/misc/plus3soundfix.htm</a><br />
looks relatively simple. However, it?s not clear to me, if this would also work on a +3 Issue One. According to the author, it worked well on his later issues.<br />
<br />
What do you think?]]></description>
   </item>
   <item>
      <title>Using an EPROM in a 48K Spectrum</title>
      <link>https://worldofspectrum.org/forums/discussion/49898/using-an-eprom-in-a-48k-spectrum</link>
      <pubDate>Tue, 13 Jan 2015 22:35:28 +0000</pubDate>
      <dc:creator>balford</dc:creator>
      <guid isPermaLink="false">49898@/forums/discussions</guid>
      <description><![CDATA[There are plenty of guides as to how to do this floating around, however I didn't like the fact that you can't then plug in the standard 27128 ROM chip after the board is modified.<br />
<br />
So I decided to approach this from a different angle :)<br />
<br />
I started with the guide found <a href="http://www.retroleum.co.uk/electronics-articles/how-to-replace-the-rom-of-a-zx-spectrum-with-an-eprom/" rel="nofollow">here</a>, which seems to be the pretty standard way of doing things.<br />
<br />
Next I desoldered the ROM links, and installed pin headers in the four link positions, and one more at the ground point shown in the above guide:<br />
<br />
<img src="https://farm8.staticflickr.com/7546/16086982108_0e15665670_z_d.jpg" alt="16086982108_0e15665670_z_d.jpg" /><br />
<br />
Next I built this little contraption :)<br />
<br />
<img src="https://farm9.staticflickr.com/8645/16087149690_f0a00ed045_z_d.jpg" alt="16087149690_f0a00ed045_z_d.jpg" /><br />
<br />
Flipping the board over, to take care of the link between pin 1 and pin 28, I soldered in a couple of more pin headers, this time with the plastic surround still on so as not to short against adjacent traces:<br />
<br />
<img src="https://farm8.staticflickr.com/7576/16087149150_713255784b_z.jpg" alt="16087149150_713255784b_z.jpg" /><br />
<br />
(Shown with the wire link installed, this can be easily removed)<br />
<br />
Here's a shot with the diode/resistor circuit installed, so if I want to plop in a standard ROM for whatever reason I can just pull the wire link from the underside and install standard ROM links instead of the circuit, no soldering needed :)<br />
<br />
<img src="https://farm8.staticflickr.com/7570/16088646167_ac5ce0be5d_z_d.jpg" alt="16088646167_ac5ce0be5d_z_d.jpg" /><br />
<br />
And a final shot for proof :)<br />
<br />
<img src="https://farm8.staticflickr.com/7536/16273695152_0482c66169_z.jpg" alt="16273695152_0482c66169_z.jpg" /><br />
<br />
Only drawback is that you can only use the bottom 16K of the EPROM, but you could always wire in a switch as shown in the guide, and if you're going down that route you might as well do it the classic way :)<br />
<br />
Hope someone finds this useful.<br />
<br />
B]]></description>
   </item>
   <item>
      <title>IDEA: ZX Spectrum dock.</title>
      <link>https://worldofspectrum.org/forums/discussion/49907/idea-zx-spectrum-dock</link>
      <pubDate>Thu, 15 Jan 2015 14:51:34 +0000</pubDate>
      <dc:creator>Korinel</dc:creator>
      <guid isPermaLink="false">49907@/forums/discussions</guid>
      <description><![CDATA[
<ul>
</ul>
The ZX Spectrum dock<br />
<br />
Inspired by my foray into RGB/SCART cables and my XPS 12 dock:<br />
<img src="http://i.dell.com/sites/imagecontent/products/PublishingImages/xps-12-9q33/laptop-xps-12-mlk-love-pdp-6d.jpg" alt="laptop-xps-12-mlk-love-pdp-6d.jpg" /><br />
<br />
I&#8217;ve started on a new project, to produce a primitive docking station for the ZX Spectrum. The idea is that all the inputs/outputs of a Spectrum are plugged into the dock, the dock then enhances each input. The dock would work for all Sinclair machines (the Amstrads have differing PSU connectors and RGB settings making them a faff).<br />
<br />
<img src="http://www.livewiredesign.co.uk/ZXSpectrumDock.png" alt="ZXSpectrumDock.png" /><br />
<br />
I thought I&#8217;d pass the idea along so I can perhaps include other ideas, or get wind of issues that the project might have before I started building it! Other than the power and SCART parts I've not even began to design this properly!<br />
<br />
The dock would be powered by the normal Spectrum power supply, from the dock would be a traditional 9v barrel lead that would plug into the Spectrum.  This means (especially as I'm not using the edge connector) we can do a few things:
<ul>
<li>We can have a proper on off switch</li>
<li>We can have an LED to show if the Spectrum has power or not.</li>
<li>We draw power for the dock prior to power entering the Spectrum so we don&#8217;t draw too much away.</li>
<li>We can provide the Spectrum a better 9v supply thus reducing the work of the 7805, so heat inside the Spectrum should reduce and components lives extended.</li>
</ul>
The dock would have an RF input socket for RF and would provide an RGB cable + connector for the toastracks. The dock would have ear &amp; mic sockets inputs.
<ul>
<li>On the output side, it would provide SCART, RF and Component + Audio L &amp; R.</li>
<li>For 16/48 we can mix the audio from the ear with the RF (like the Currah Microspeech) so we have sound through the TV.</li>
<li>Now we have a good power source we can provide all the power requirements of the SCART cable (e.g. pin 8 and 16) that current ZX Spectrum SCART cables do not provide.</li>
<li>(We might be able to demodulate the RF and for the component / SCART for the 16/48s (not researched this bit)).</li>
<li>We might be able to amplify the sound coming into the dock so that MP3 players and Mobile phones/tablets can be used to play TZX/WAV files and the ZX Spectrum load them as though they were on tape.</li>
<li>The dock can be configured (SCART settings / perhaps desired outputs) via switches.</li>
</ul>
<br />
Edit:<br />
<br />
Could I get HDMI out?<br />
Anything I do with the keypad and RS232 on the toastrack?]]></description>
   </item>
   <item>
      <title>Issue 1 16K RAM bank</title>
      <link>https://worldofspectrum.org/forums/discussion/49912/issue-1-16k-ram-bank</link>
      <pubDate>Thu, 15 Jan 2015 18:11:59 +0000</pubDate>
      <dc:creator>Falco-F8L</dc:creator>
      <guid isPermaLink="false">49912@/forums/discussions</guid>
      <description><![CDATA[Folks,<br />
<br />
I recently had a chance to fix a couple of Issue 1 boards, and learned the hard way that the chips in the 16K RAM bank have a different placement when compared with all other issues.<br />
<br />
All issues from 2 up have the ram chips lined up the most logical way i.e. from D7 to D0 from left to right (IC13...IC6)<br />
<br />
with Issue 1, chips arrangement is D7-D6-D5-D4-D3-D0-D2-D1 from left to right (IC13-IC12-IC11-IC10-IC9-IC6-IC8-IC7).<br />
<br />
This would have never crossed my mind, but when I was desperate chasing the apparently meaningless reports from the Fruitcake RAM tester, I finally checked all the connections and made the bitter discovery. Lots of lost hours for naught. Sigh.<br />
<br />
The Issue 1 board layout is not documented anywhere, to the best of my knowledge. A quick search in the message board archives does not reveal anything on this subject, too.<br />
<br />
It therefore feels appropriate to have it documented here, in hope that this saves a lot of frustration to someone else.]]></description>
   </item>
   <item>
      <title>48k Problems</title>
      <link>https://worldofspectrum.org/forums/discussion/49891/48k-problems</link>
      <pubDate>Tue, 13 Jan 2015 11:48:17 +0000</pubDate>
      <dc:creator>SimonLCFC</dc:creator>
      <guid isPermaLink="false">49891@/forums/discussions</guid>
      <description><![CDATA[Bought in a 48k at work just before christmas.  Nice machine, boxed (box has seen better days) and i'm presuming it's an issue 1 machine (001-596759.)<br />
<br />
Unfortunately, when the machine is plugged in, the Sinclair Logo appears fine at the bottom, but the screen is peppered with pixels and it freezes up?<br />
<br />
Any ideas what the issue could be, and if so, any kind of solution?<br />
<br />
Si]]></description>
   </item>
   <item>
      <title>ZX Evolution -- contended memory and raster emulation</title>
      <link>https://worldofspectrum.org/forums/discussion/49908/zx-evolution-contended-memory-and-raster-emulation</link>
      <pubDate>Thu, 15 Jan 2015 15:00:06 +0000</pubDate>
      <dc:creator>lvd</dc:creator>
      <guid isPermaLink="false">49908@/forums/discussions</guid>
      <description><![CDATA[Fresh bleeding update for <a href="http://www.nedopc.com/zxevo/zxevo_eng.php" rel="nofollow">ZX Evolution</a> <a href="https://code.google.com/p/pentevo/source/list" rel="nofollow">Baseconf</a> -- raster and ULA contended memory emulation for original 48k and 128k models.<br />
<br />
Here is some presentation (in russian, probably useless), which demonstrates how some 48k or 128k prods are working:<br />
<a href="http://www.youtube.com/watch?v=XOayIyZPAvk" rel="nofollow">http://www.youtube.com/watch?v=XOayIyZPAvk</a><br />
<br />
Download fresh files from SVN here (this is not an official <a href="http://nedopc.com" rel="nofollow">NedoPC</a> release yet!)<br />
<a href="http://pentevo.googlecode.com/svn-history/r687/avr/current/default/zxevo_fw.bin" rel="nofollow">zxevo_fw.bin</a><br />
<a href="http://pentevo.googlecode.com/svn-history/r687/rom/zxevo.rom" rel="nofollow">zxevo.rom</a><br />
<br />
<br />
Some info:<br />
<br />
1. Contened memory is emulated as described here at WoS. However, this is still an emulation, i.e. no actual video fetches are done exactly as on orignal Speccies.<br />
<br />
2. Rasters are correct (224/312/69888 and 228/311/70908), yet the CPU frequency is always 3.500 MHz, since 3.54 MHz is unavailable at the board.<br />
<br />
3. There is no port FF currently. I'm not sure whether there is exact description of what should be read from there at every cycle. If there is any, please give me a link.<br />
<br />
4. Port decoding is still 'redundant' (means port #FE is decoded with full low part of address, not only A0), as it was in Baseconf from the beginning. Yet some hacks added for port #7FFC to work correctly.<br />
<br />
5. Yet no +3 timing emulation, though some provisions are made. If you have some multicolor/border prods (games or demos) for +3 mode, please give me links. Currently I'm in doubt whether +3 emulation is really needed at all.<br />
<br />
<br />
Some usage instructions (provided you have basic knowledge of ZX Evolution and ERS):<br />
<br />
1. Scroll Lock key now selects both 15kHz or 31kHz raster and cycles through pentagon-&gt;60Hz-&gt;48k-&gt;128k raster modes. Single stroke changes 15 to 31 or vice versa, double stroke cycles through different rasters.<br />
<br />
2. Contended memory works only if you have 48k or 128k raster (shown in upper right corner just below time and date) AND 3.5MHz CPU frequency.<br />
<br />
3. If you want running TAP's with original 48k or 128k ROM set, first disable tape autostart in "Setup", then select your TAP, then go to "Service" and select either 48k or 128k ROM. Then proceed as always -- LOAD "".<br />
<br />
<br />
Thankyous:<br />
<br />
Savelij: for supporting this new feature in his EVO Reset Service and fixing bugs timely.<br />
<br />
Alone: for betatesting<br />
<br />
Gasman: for some help with raster/contended memory<br />
<br />
Mike &amp; Ellvis from ZeroTeam: for some sources regarding 128k multicolor effect.<br />
<br />
Alone, Gasman, Mike &amp; Ellvis, Yerzmyey, bolek: for supporting me with different 48/128 games and demos that use multicolor or border effects.<br />
<br />
Harlequin clone maker, emulator writers: for your very valuable insight into contended memory topic and useful discussions.<br />
<br />
<br />
Please post any bug reports here: <a href="http://forum.nedopc.com" rel="nofollow">http://forum.nedopc.com</a>]]></description>
   </item>
   <item>
      <title>48k issue 2 video issue</title>
      <link>https://worldofspectrum.org/forums/discussion/49892/48k-issue-2-video-issue</link>
      <pubDate>Tue, 13 Jan 2015 13:52:31 +0000</pubDate>
      <dc:creator>Firefox11</dc:creator>
      <guid isPermaLink="false">49892@/forums/discussions</guid>
      <description><![CDATA[Hi folks. I am currently tring to fix an issue 2 board. I was getting the yellow greenish screen. (also there there is a lower ram fault with it i think) I have been adjusting VR1 and VR2 and got the picture almost perfect but I am still getting some slight yellow banding on the display. I suppose just keep adjusting or could be something else?]]></description>
   </item>
   <item>
      <title>Mystery Port on ZX Spectrum 48k +</title>
      <link>https://worldofspectrum.org/forums/discussion/49880/mystery-port-on-zx-spectrum-48k</link>
      <pubDate>Mon, 12 Jan 2015 00:46:05 +0000</pubDate>
      <dc:creator>RetroPhase2014</dc:creator>
      <guid isPermaLink="false">49880@/forums/discussions</guid>
      <description><![CDATA[Hi,<br />
I was wondering if anyone could help me with a little mystery?<br />
<br />
After I tripped over my first 48k +, and knocked out the joystick expansion, I bought an almost identical 48k + from a second hand shop to replace it.<br />
<br />
This was around 1994. I never opened the replacement speccy up but, on the left hand side of the QL-style keyboard, there was a silver phono port and a 'stick' type silver toggle switch.<br />
<br />
I was never able to figure out what it was. In recent years I've started to wonder if it was an RCA video port (especially since it was so close to the internal RF modulator), or possibly audio.<br />
<br />
I haven't owned that Spectrum for over a decade now (2004) so I can't test out my theory - does anyone here know what the port was for?]]></description>
   </item>
   <item>
      <title>Dodgey R62 / D16 on Issue 2?</title>
      <link>https://worldofspectrum.org/forums/discussion/49193/dodgey-r62-d16-on-issue-2</link>
      <pubDate>Sat, 25 Oct 2014 20:23:35 +0000</pubDate>
      <dc:creator>Korinel</dc:creator>
      <guid isPermaLink="false">49193@/forums/discussions</guid>
      <description><![CDATA[Hello all,<br />
<br />
I am still beavering away trying to work out why my Issue 2 fails and after a much closer visual inspection I noticed what looks like some damage (see below) and in the Spectrum Repair guide it says:<br />

<blockquote>

<div>You may also visually check , to see that R79 2k2 (Issue 6) or R62 15R (Issue 6) or R55 56R (Issue 4 and less) are not discoloured. If any of the 55R resistors are badly discoloured, change D15 BA137 on all models.</div>
</blockquote>
<br />
May I have some assistance pretty please :)<br />

<ol>
<li>Does the R62 look as though it has failed?</li>
<li>Is the D16 destroyed too, it has no yellow band like it's brothers and sisters.</li>
<li>Do we know what would cause this to occur?</li>
<li>Besides the D15 BA 137 is their likely to be any other component to have suffered damage?</li>
<li>Where would I get the failed bits from?</li>
<li>D16 to me seems part of the circuit that shifts the current from 9v to 12v, however when I performed resistance tests all appears okay, I am a bit loathed to switch it on, is there a quick test  can do to confirm the failures?</li>
</ol>
<br />
<br />
<img src="http://www.livewiredesign.co.uk/R62andD16.png" alt="R62andD16.png" />]]></description>
   </item>
   <item>
      <title>Elinca ZX Tapeloader</title>
      <link>https://worldofspectrum.org/forums/discussion/49513/elinca-zx-tapeloader</link>
      <pubDate>Sat, 22 Nov 2014 18:15:44 +0000</pubDate>
      <dc:creator>Graz</dc:creator>
      <guid isPermaLink="false">49513@/forums/discussions</guid>
      <description><![CDATA[Heya.  There's an Ebay auction here...<br />
<br />
<a href="http://www.ebay.co.uk/itm/2x-Sinclair-ZX-Spectrum-Computers-with-printer-microvision-TV-Accessories/221606593375?_trksid=p2047675.c100011.m1850&amp;_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D28111%26meid%3Dc75b86a2db2a4ffcaad034221a9b8e36%26pid%3D100011%26prg%3D11472%26rk%3D1%26rkt%3D10%26sd%3D221612263127" rel="nofollow">http://www.ebay.co.uk/itm/2x-Sinclair-ZX-Spectrum-Computers-with-printer-microvision-TV-Accessories/221606593375?_trksid=p2047675.c100011.m1850&amp;_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D28111%26meid%3Dc75b86a2db2a4ffcaad034221a9b8e36%26pid%3D100011%26prg%3D11472%26rk%3D1%26rkt%3D10%26sd%3D221612263127</a><br />
<br />
<br />
(golly, that's a big link!)<br />
<br />
ID: 221606593375<br />
<br />
Just wondering what the Tapeloader box actually does.  Not seen one before.  Looks like a funky big box indeed.]]></description>
   </item>
   <item>
      <title>Ways to identify spectrum issues with out opening them?</title>
      <link>https://worldofspectrum.org/forums/discussion/49698/ways-to-identify-spectrum-issues-with-out-opening-them</link>
      <pubDate>Fri, 19 Dec 2014 10:13:40 +0000</pubDate>
      <dc:creator>vanpeebles</dc:creator>
      <guid isPermaLink="false">49698@/forums/discussions</guid>
      <description><![CDATA[A good while ago, I'm sure I saw some posts on here about how to identify what issue speccy you have by looking in the expansion port to see what heat sink it had etc.<br />
<br />
Is there a handy guide for identifying speccies with out having to open them?]]></description>
   </item>
   <item>
      <title>48K Not booting properly</title>
      <link>https://worldofspectrum.org/forums/discussion/49816/48k-not-booting-properly</link>
      <pubDate>Fri, 02 Jan 2015 18:27:44 +0000</pubDate>
      <dc:creator>whoremoan</dc:creator>
      <guid isPermaLink="false">49816@/forums/discussions</guid>
      <description><![CDATA[Bought another faulty spectrum from Ebay.<br />
<br />
This one, when you turn it on, it looks like it's going to boot OK, but when it gets to the point where it should display the copywrite notice, I get a black K in the middle of the screen and a low constant beep from the speaker.<br />
<br />
I found I had a faulty Lower RAM IC (IC 6) and replaced that, but didn't fix the problem.<br />
<br />
I then tried connecting +5v to pin 5 of IC23 to boot it as 16K and that works.<br />
I entered the command 'PRINT PEEK 23732 + PEEK 23733 * 256' and I get back 65535 which you would expect for a 48K spectrum.<br />
I then tried to load the memory test program from Zorns website but I get an R-Tapeload error at the end of the first part of the program loading.<br />
if you list the program most of it is garbage.<br />
I'm guesing I still have a memory fault somewhere? Anyone got any ideas?]]></description>
   </item>
   <item>
      <title>2e -&gt; 3e</title>
      <link>https://worldofspectrum.org/forums/discussion/49862/2e-3e</link>
      <pubDate>Thu, 08 Jan 2015 22:33:11 +0000</pubDate>
      <dc:creator>gorski</dc:creator>
      <guid isPermaLink="false">49862@/forums/discussions</guid>
      <description><![CDATA[Hi All :)<br />
I got for first time 2a with ide inside :) aka 2e<br />
put fdd controller .. and get 3e! :)<br />
question is why 3e don't give up to read from disk and unable to boot from c: as normal without fdd (tape) ?... and how to load from tape in this configuration .. :) strange strange 2a at all .. :)<br />
<br />
<a href="http://www.youtube.com/watch?v=0dEdeWTfa-A" rel="nofollow">http://www.youtube.com/watch?v=0dEdeWTfa-A</a><br />
<br />
Greets,<br />
Gorski]]></description>
   </item>
   <item>
      <title>IF1Bis problems. The Edge of the Spectrum...</title>
      <link>https://worldofspectrum.org/forums/discussion/46810/if1bis-problems-the-edge-of-the-spectrum</link>
      <pubDate>Wed, 05 Mar 2014 00:00:57 +0000</pubDate>
      <dc:creator>Amplitude</dc:creator>
      <guid isPermaLink="false">46810@/forums/discussions</guid>
      <description><![CDATA[Advice is sought from the learned on WoS.<br />
<br />
I just bought an Interface 1Bis from sunny South Africa. It arrived fast, but unfortunately doesn't work. Let me explain...<br />
<br />
The device won't enter a usable state without horrendous crashes of the Spectrum (a 128k, but also tried on a gray +2). After my first cleaning of the edge connector, no improvements. After 5 odd days of cleaning, re-seating, trying to update the boot code and general technical mucking about, I can at last get the Kempston Joystick Interface working.<br />
<br />
But that's it. Trying the interface itself crashes the spectrum with lines of graphic junk on screen. I've emailed Dan, and I've been told that the errors are consistent with a bad connection. Clean the connections, so I did again. Prior to my 2nd 'de-oxidation' cleaning (yesterday) entering the 1Bis into a running state crashed and froze the Spectrum. Now it just crashes it, but I can reset the Spectrum without pulling the wall plug. I tried my +2 as well, with the same results.<br />
<br />
But here's the rub. I've checked out <a href="http://www.if1bis.com/" rel="nofollow">http://www.if1bis.com/</a>, where there's walkthroughs on processes to test stability. This includes what for me is a fatal error - walking about with a live interface 'wobbling' at the back of your spectrum to test stability. Spectrum's are not 'laptops' and I seem to remember from my 30 year old Spectrum Manual that it says not to move it about when on. Anyway, there's also an in depth many pictured post (by 'Rune'. Is it the same Rune posting here?), which is very good for sure and goes in depth about 're-tinning' an edge connector. But sadly in a small post at the end of the in depth explanation, Rune reports the Spectrum died a horrible death shortly thereafter.<br />
<br />
I'm not sure what to do next. It doesn't work, except the Kempston Joystick interface. To go further I'm going to have to flatten entirely the edge connections, which I've already done as far as I dare. The connector is now nice and shiny. But a re-tinning operation for my 128k is for me a step too far. So I'm stuck. :confused:<br />
<br />
Your thoughts welcomed. A workable fix especially :wink:]]></description>
   </item>
   <item>
      <title>Robik</title>
      <link>https://worldofspectrum.org/forums/discussion/49837/robik</link>
      <pubDate>Tue, 06 Jan 2015 08:03:34 +0000</pubDate>
      <dc:creator>Falco-F8L</dc:creator>
      <guid isPermaLink="false">49837@/forums/discussions</guid>
      <description><![CDATA[Hello to all,<br />
<br />
Is anyone experienced on this russian clone? I have one at hand with corrupted screen (but it boots and replies to keyboard inputs so it's strictly a picture generation problem). I have a very poor quality scan of the schematic, and thankfully a fairly compete russian IC cross reference.<br />
<br />
Here is a photo of actual behavior:<br />
<br />
<img src="http://andrea.modelberg.it/foto0046.jpg" alt="foto0046.jpg" />]]></description>
   </item>
   <item>
      <title>Z80 Special Reset</title>
      <link>https://worldofspectrum.org/forums/discussion/49839/z80-special-reset</link>
      <pubDate>Tue, 06 Jan 2015 20:47:31 +0000</pubDate>
      <dc:creator>TonyB</dc:creator>
      <guid isPermaLink="false">49839@/forums/discussions</guid>
      <description><![CDATA[The Z80 CPU has two types of reset, normal and special. The latter is little-known and for more information please see<br />
<a href="http://www.primrosebank.net/computers/z80/z80_special_reset.htm" rel="nofollow">http://www.primrosebank.net/computers/z80/z80_special_reset.htm</a><br />
<br />
Any questions or comments about the special reset or my article would be welcome.]]></description>
   </item>
   <item>
      <title>+2A/+3 +2B and +3 Schematics (again)</title>
      <link>https://worldofspectrum.org/forums/discussion/49829/2a-3-2b-and-3-schematics-again</link>
      <pubDate>Mon, 05 Jan 2015 01:23:52 +0000</pubDate>
      <dc:creator>guesser</dc:creator>
      <guid isPermaLink="false">49829@/forums/discussions</guid>
      <description><![CDATA[Just to announce that I've done a fairly big update/re-organisation of my website, and specifically the <a href="http://alistairsserver.no-ip.org/spectrum/schematics/" rel="nofollow">schematics page</a>.<br />
<br />
I'm finally getting around to adding all the information I've gathered about the differences between different board revisions, the modifications made at the factory to certain boards, and various other bits and bobs that have been sitting in a text file waiting for me to write up for far too long.<br />
<br />
I've also, with a lot of help from <a href="http://www.worldofspectrum.org/forums/member.php?u=2551" rel="nofollow">Glenn</a>, put up a new schematic for the +2B ISSUE2 and got lots of "interesting" detail which I will be writing up soon along with the details of factory mods on the +2B boards.<br />
<br />
Still no ISSUE 4 schematic I'm afraid, and as always if you find any errors in the schematic or the text, let me know :)<br />
<br />
<br />
<br />
TL;DR: The +2B schematics have been updated ;)]]></description>
   </item>
   <item>
      <title>"real good" keyboard membranes for Spectrum+</title>
      <link>https://worldofspectrum.org/forums/discussion/49533/real-good-keyboard-membranes-for-spectrum</link>
      <pubDate>Tue, 25 Nov 2014 06:18:54 +0000</pubDate>
      <dc:creator>ingo</dc:creator>
      <guid isPermaLink="false">49533@/forums/discussions</guid>
      <description><![CDATA[Hi,<br />
<br />
is there a possibility that someone will produce a real good substitue for defective membranes of Spectrum+ or 128k heatasink.<br />
I bought several membranes (more then 10 until now) from different distributors (in Germany, in England) - the last ones at the 30th aniversary meeting in Cambridge. I never got one good membrane until now. The layers are not congruent glued. The material has too much firmness - resultung in insensible keys at the borders (as the cursor keys, Break, Delete).<br />
Therefore for me the damage of an original membrane means the death of this keyboard. So nowadays only the keyboards of the +2/+2A/B/+3 are usable.<br />
I would pay more money to get a satisfying membrane for my Spectrum+ computers, if anyone would make it.<br />
<br />
Greets<br />
<br />
Ingo.]]></description>
   </item>
   <item>
      <title>Ram Turbo Interface with Kempston and Sinclair/Amstrad joysticks</title>
      <link>https://worldofspectrum.org/forums/discussion/49824/ram-turbo-interface-with-kempston-and-sinclair-amstrad-joysticks</link>
      <pubDate>Sun, 04 Jan 2015 19:13:33 +0000</pubDate>
      <dc:creator>DaRkHoRaCe</dc:creator>
      <guid isPermaLink="false">49824@/forums/discussions</guid>
      <description><![CDATA[Hi!<br />
Do you know how to plug and use two different joysticks with the Ram Turbo interface?<br />
<br />
<a href="http://www.worldofspectrum.org/infoseekid.cgi?id=1000328" rel="nofollow">http://www.worldofspectrum.org/infoseekid.cgi?id=1000328</a><br />
<br />
If I plug a Kempston and A SJ I have a clone of the first joystick :( (If I move player one with the first joystick, it moves also with the second joystick)<br />
<br />
I'd like to play with my nephew tonight.. In the worst case I'll use the keyboard.<br />
<br />
Can you suggest me the best/funny two player games For 48K /128K ?<br />
<br />
Thank you all in advance!<br />
<br />
Paolo]]></description>
   </item>
   <item>
      <title>Disciple extension</title>
      <link>https://worldofspectrum.org/forums/discussion/49818/disciple-extension</link>
      <pubDate>Sun, 04 Jan 2015 16:23:43 +0000</pubDate>
      <dc:creator>Falco-F8L</dc:creator>
      <guid isPermaLink="false">49818@/forums/discussions</guid>
      <description><![CDATA[Hello to all!<br />
<br />
Today I successfully repaired a MGT Disciple belonging to a friend of mine, and in the process I had a chance to study a little this remarkable device. Reading through the schematic I was surprised to see that the folks at MGT added four side pins to the edge connector, which have been connected to a few internal signals (two on shadow ROM chip enable and one to output bit 5 of port $31). Supposedly, these proprietary pins are used some kind of expansion board. Does anyone know anything about such device?]]></description>
   </item>
   <item>
      <title>Ebay +3 Madness</title>
      <link>https://worldofspectrum.org/forums/discussion/49813/ebay-3-madness</link>
      <pubDate>Fri, 02 Jan 2015 15:05:02 +0000</pubDate>
      <dc:creator>chinnyhill10</dc:creator>
      <guid isPermaLink="false">49813@/forums/discussions</guid>
      <description><![CDATA[Just out of idle curiosity, why on earth would people be bidding ?185 with 2 days still to go on this seemingly run of the mill +3?<br />
<br />
<a href="http://www.ebay.co.uk/itm/Sinclair-ZX-Spectrum-3-128k-BLACK-Computer-Working-with-new-drive-band-/191458986824?pt=UK_VintageComputing_RL&amp;hash=item2c93d84b48" rel="nofollow">http://www.ebay.co.uk/itm/Sinclair-ZX-Spectrum-3-128k-BLACK-Computer-Working-with-new-drive-band-/191458986824?pt=UK_VintageComputing_RL&amp;hash=item2c93d84b48</a><br />
<br />
Quite often see madness on Ebay but this one takes the biscuit. Surely it's worth about 40 quid absolute max?]]></description>
   </item>
   <item>
      <title>Spectrum +2a memory</title>
      <link>https://worldofspectrum.org/forums/discussion/49814/spectrum-2a-memory</link>
      <pubDate>Fri, 02 Jan 2015 16:23:37 +0000</pubDate>
      <dc:creator>bagpuss22</dc:creator>
      <guid isPermaLink="false">49814@/forums/discussions</guid>
      <description><![CDATA[Hi all,<br />
<br />
Happy New Year.<br />
<br />
A quick question, I have a Spectrum +2a that I am seeing a very<br />
intermittent fault, once every 20 - 30 power ups.<br />
<br />
I plugged in the diagnostic board and when it happens it seems to fail the lower 16K memory test.<br />
<br />
Does anyone know which of the 4 IC's this would equate too? or is it spread over the 4 4164s?<br />
<br />
Thanks<br />
<br />
Russ]]></description>
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   <item>
      <title>Need help with +2a graphics glitch</title>
      <link>https://worldofspectrum.org/forums/discussion/49808/need-help-with-2a-graphics-glitch</link>
      <pubDate>Fri, 02 Jan 2015 02:54:38 +0000</pubDate>
      <dc:creator>Ox.</dc:creator>
      <guid isPermaLink="false">49808@/forums/discussions</guid>
      <description><![CDATA[First of all It's my first time on here so, Hi!<br />
<br />
Recently got back into the spectrum scene by buying a +2a and a DivMMC (a lovely piece of kit btw), also bought a spectrum +2a rgb to scart cable from retro computer shack - plugged it all in, everything works fine apart from some small flickering short dark vertical lines that only seem to appear to the left of a line of text (about the same height as the text char on screen)?!?  This is especially noticable on the startup "Menu" selection options.<br />
<br />
So I'm needing to know what and how to test/replace in order to get this working 100%, any help appreciated, thanks.]]></description>
   </item>
   <item>
      <title>Double keystrokes on zx spectrum</title>
      <link>https://worldofspectrum.org/forums/discussion/49801/double-keystrokes-on-zx-spectrum</link>
      <pubDate>Thu, 01 Jan 2015 13:59:14 +0000</pubDate>
      <dc:creator>zxviking</dc:creator>
      <guid isPermaLink="false">49801@/forums/discussions</guid>
      <description><![CDATA[Happy New Year everyone. I have this spectrum 48k issue 3b I?ve been working on now and then. I have replaced upper rams, installed a lower ram replacement module and it starts up fine. But, every time I press a key it registers it twice, making it impossible to operate. Typing for example J (load) gives <b>load load</b> on the screen. Have tried to search the Internet for a fix, but no luck so far. Does anyone here have an idea what causes this?]]></description>
   </item>
   <item>
      <title>Ball-top Colour</title>
      <link>https://worldofspectrum.org/forums/discussion/49766/ball-top-colour</link>
      <pubDate>Sun, 28 Dec 2014 16:16:28 +0000</pubDate>
      <dc:creator>Swevicus</dc:creator>
      <guid isPermaLink="false">49766@/forums/discussions</guid>
      <description><![CDATA[Follow-on from my Joystick Poll thread. I have decided to go with the ball-top joystick handle for my PC/Retro Computer arcade stick controller, and now I would like to ask you, my potential audience, what colour ball-top handle you would most prefer (although it can always be removed in favour of a different one by the user).]]></description>
   </item>
   <item>
      <title>48K keyboard problem</title>
      <link>https://worldofspectrum.org/forums/discussion/49793/48k-keyboard-problem</link>
      <pubDate>Wed, 31 Dec 2014 20:47:23 +0000</pubDate>
      <dc:creator>gazj82</dc:creator>
      <guid isPermaLink="false">49793@/forums/discussions</guid>
      <description><![CDATA[I have a strange issue with an issue 2 48k spectrum.  Hopefully you guys can point me in the right direction in finding the fault.<br />
<br />
For some reason the keyboard does not work until you lift the case open a few mm, as soon as it is shut tight the keyboard does not work?!  I can't see anything that is causing a short on the board.  The keyboard has a new membrane so I can't see that being the problem, plus not matter how I bend the ribbons with case open it never causes the keys to stop working!<br />
<br />
Anyway is there anything I should be looking for, changing measuring at points in the spectrum?]]></description>
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   <item>
      <title>How best to remove glue from ZX81 keyboard??</title>
      <link>https://worldofspectrum.org/forums/discussion/49782/how-best-to-remove-glue-from-zx81-keyboard</link>
      <pubDate>Tue, 30 Dec 2014 18:00:57 +0000</pubDate>
      <dc:creator>RSwipeCA</dc:creator>
      <guid isPermaLink="false">49782@/forums/discussions</guid>
      <description><![CDATA[Hey all, hope your having a great Christmas so far.<br />
<br />
After removing a faulty keyboard membrane from a ZX81 I have been left with the glue sticking to the plastic where the keyboard used to be.<br />
<br />
Does anyone have a tried and true method for removing this residue? It's pretty hard to get off, and although it's not entirely necessary to remove before fitting the new one, it makes sense to do a proper job.<br />
<br />
I have acetone, but that risks melting the plastic or at least marking it.<br />
<br />
Here's a pic ....<br />
<br />
<a href="http://www.dropshots.com/RSwipeCA/date/2014-12-30/12:43:04" rel="nofollow">http://www.dropshots.com/RSwipeCA/date/2014-12-30/12:43:04</a>]]></description>
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