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Zx Spectrum Laptop (again)I've been reading all the old treads about a possible portable speccy. I even found the one about the Speccy Laptop. But it seems there's a lot of ne…
... replacement?
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12 Volt is used by PAL encoder ... -
Oxford Speccy meetup, October 20th[b]Update:[/b] Date and venue decided - The Gloucester Arms, from 2pm, 20 October 2007. Full details: [url]http://matt.west.co.tt/spectrum/oxford-spe…
I'll bring a 12 volt lead acid battery if we need extra power -
Spectrum 128+ (No TV picture)I got a Spectrum 128+ which is not generating any picture. I checked the TEA2000, and it gets not 12 Volt, but only 1.4, so this is the problem, I gu…
... TEA2000, and it gets not 12 Volt, but only 1.4, so ... is in reality +11.4 Volt (but the same also with ... check if all be ok ( volt and tip31 don't overheat ... -
component out?I would like to connect ZX48K to plasma TV with component cable. I read somewhere that signals are on the expansion edge connector. Do I need somethi…
... .[/QUOTE]I use a switching 12 volt external PSU. Between the PSU ... -
component out?I would like to connect ZX48K to plasma TV with component cable. I read somewhere that signals are on the expansion edge connector. Do I need somethi…
Find the point for -5 volt on the ZX 48K PCB ... track.
Same for +12 volt.
Now you must ... solder a wire from +5 volt (pin 9) to all pin ... : Make a +5 volt connection to the ex 12 volt track.
Remove +12 Volt itemsWhich items can be removed on a ZX48K issue 4b PCB if I don't need the +12 Volt? Micky
... rams. They only need +5 volt. The upper ram I changed ... one 32K ram.
12 volt for LM 1889 can be ... because I'll use a 12 volt switching PSU.
Alternative speccy power supplysI know all us would have our speccys with the original power supply,but often i would see a distress call from people who got speccy from ebay but on…
RGB SCART Not Working on ZX 128K (heatsink)I've just received a SCART RGB to HDMI converter and it is not working with my ZX 128K (heatsink). I do have the correct 128K SCART cable (which is d…
... /> Dont do it. +2A has +12 Volt where 128+ has Composite video ...Second Hand SpectrumHi just joined the Forum. I have picked up a Spectrum at a s/h shop and would like some advice please. I have had two ZX81's packed away for severa…
Whats about the LM1889 Video chip? Does it not need +12 Volt too?Second Hand SpectrumHi just joined the Forum. I have picked up a Spectrum at a s/h shop and would like some advice please. I have had two ZX81's packed away for severa…
... chip? Does it not need +12 Volt too?[/QUOTE]
Apart from ...ZX Spectrum TowerHi all, i am working on a ZX Spectrum 48K build in a PC tower case. Is there anyone who did it before? I have some questions duo the PSU. I have to g…
... answers..... I have made the 12 Volt DC directly to the 9 ... Volt dc input. It works..... Now ...ZX Spectrum TowerHi all, i am working on a ZX Spectrum 48K build in a PC tower case. Is there anyone who did it before? I have some questions duo the PSU. I have to g…
... answers..... I have made the 12 Volt DC directly to the 9 ... Volt dc input. It works..... Now ...ZX Spectrum TowerHi all, i am working on a ZX Spectrum 48K build in a PC tower case. Is there anyone who did it before? I have some questions duo the PSU. I have to g…
... is needed because of the 12 Volt DC. And it is cooling ...ZX Spectrum TowerHi all, i am working on a ZX Spectrum 48K build in a PC tower case. Is there anyone who did it before? I have some questions duo the PSU. I have to g…
... is needed because of the 12 Volt DC. And it is cooling ...4116 Ram chip replacements?Hello. I am in the work of gathering replacement parts for my speccy 48k. And I would like to know what chips is good replacement for the 4116 ram ch…
Wouldn't there be a problem with the pinout if replacing the 4116 with 4164 ?
Pin 8 on the 4116 is 12 volt and pin 8 on the 4164 should be 5 volt ?
I always used a daughterboard to adjust the connections.Zx 48k after the ic7805 other problemHi everyone, i am Tiago from Portugal, and i am trying to repair a Zx Spectrum 48K. the machine didn't do anything, no image, no sound, nothing. The…
When testing the 12 volt and -5 volt lines, I always remove all ...Zx 48k after the ic7805 other problemHi everyone, i am Tiago from Portugal, and i am trying to repair a Zx Spectrum 48K. the machine didn't do anything, no image, no sound, nothing. The…
... =Knik]When testing the 12 volt and -5 volt lines, I always remove ...Replacing ZTX650 with BD139Today I blew up one of the GALs on one of my DivIDEs while testing on my Toastrack. Shorted M1 with 12V and the 12V circuit broke. I had to replace T…
When having a broken 12 volt circuit I always changed the ... 5V1 zenerdiode D19 and -5 volt is back.
Tested the ... make use of the 12 and -5 volt circuitry.
[B]A ...+2 (Grey) S-video?I have a pretty good Composite/S-video to VGA adapter that does a nice work of running my retro machines on an old LCD screen. However, it looks best…
... connector so it gives me 12 volt on pin 2.
I ...Strange and faulty toastrackI just got hold of a toastrack, which is kind of strange. First of all, when I opened it, I spotted a socketed ULA and ROM, which is good, however, t…
TEA2000 needs 12 Volt, so this voltage will be faulty on your machine. Please check it. I had similar problem, and this was the solution.Cases for New Hardware - Yes or NoAn opportunity has recently arisen whereby I may be in a postion to offer cases for alot of the new hardware which is being made at the moment. Some…
... is rated 6 Watt at 12 Volt, so I think, it won ...Settings on oscilloscope to see composite video signalHello, Learning a bit more about my new Owon digital 2 chan. oscilloscope. Would like to know what settings I should use to view a composite signal…
... /> If connected to what? The 12 volt pins on the RGB connector ...Grey +2 DiedHi all, Thrashing my +2 playing Mugsy last night and it did this... [URL="https://m.flickr.com/photos/83515822@N05/13012551693/lightbox/"]https://m…
... . The system 5 V power supply must be present. The ULA ... DIN connector, then the 12 V supply must be present too. Unlike ... Spectrums, loss of the 12 V supply does not completely stop the ...USB Keyboard Interface interest?Hi, I was wondering if anyone else out there is interested in a USB interface for the ZX Spectrum (particularly the rubber key models, though it sho…
... power connector has +5 and +12 volt swapped from where you'd ...Powering a Spectrum with 5v?I live in the States, but I'm originally from England. My original Spectrum is still at my mum's house in the UK, and I was thinking of asking her t…
... obtaining a US mains power supply that outputs 8 - 9 ... have to be a regulated supply, though it'll probably ... the negative side of the supply. You'll very likely ... encoder also uses a 12 V supply. These are generated by ... a
5 V supply, though I would think it ...Finally got round to itFinally got round to giving my old speccy a close look. Details 1982 Issue 2 Seriel No 001 196193 Hmm... Followed the initial tests on You tube w…
...
O volt rail-----0
+5 volt rail----0.8 ...
-5 volt rail----80.1 ... on 2K range
+12 volt rail---850 ohm
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Opus Discovery "the big switch on" (after 20 years)I have a few of these Opus Discovery's with different Eproms in that have not been swiched for 15-20 years or so . I am in no rush to switch any on …
... of using a 12v + 5 volt supply) comes with its own specific ...Opus Discovery "the big switch on" (after 20 years)I have a few of these Opus Discovery's with different Eproms in that have not been swiched for 15-20 years or so . I am in no rush to switch any on …
... supplies needed for the 5 volt and 12 volt ie the power requirements ...+2A to PC/AndroidIt's been so long now I forget, but do the +3 cassette leads work for the +2A with regard to hooking the Speccy up to a PC or an Android device? If …
... runs from a 3.3 volt supply then you're really going ... it's a 1.8 volt supply then you don't stand ...
