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'Interesting' Issue 2 modSo I've been lurking on this forum for a while and I've got to the point where I want to see if I can repair a speccy.. so I bought me a 'broken' one…
... left pin of any remaining lower ram chip... so -5v seems to ... these.. other than it's not as much fun? ;)
'Interesting' Issue 2 modSo I've been lurking on this forum for a while and I've got to the point where I want to see if I can repair a speccy.. so I bought me a 'broken' one…
... .
With the 4116 "lower" RAM chips removed, you reduce the ... chips that need it are not fitted :D
So you ...48k Stops loading and resetsI've just fixed the problem I had with my Issue 2 Spectrum only showing 16k memory by replacing all of the upper ram. With that job done I've done a …
... swapping ULA, ROM, CPU and lower RAM to see if that made ... swapping over, but is there not a better way to check ...Noob repairs of an S2 and S6AI received two Spectrums a Series 2 and a Series 6A both of which are not working. I don't know anything about electronics so thought my lad and I wo…
... the printer, microdrives etc. may not work or will be unreliable ... the Z80. The bug was not fixed in future revisions of ... voltage generation circuitry and the lower RAM can be damaged if this ...48K Ram Check Command not workingI am trying to repair my Spectrum 48k. It is having issues loading games, sometimes they load all the way to launch and then the speccy resets. Oth…
... I replace all of the lower ram chips?
... a guess about which "lower" RAM chip has failed from ... of) does not need any working RAM to operate, ... failure of the "lower" or "upper" RAM, as long as ... not have access to any of the above items, unless a RAM ...'Interesting' Issue 2 modSo I've been lurking on this forum for a while and I've got to the point where I want to see if I can repair a speccy.. so I bought me a 'broken' one…
Right, enough moping (not entirely.. been having fun modding ...
[*]8x fried lower ram
[*]8x fried upper ram
[*]Power coil ... has the comp mod, so not too worried about this.
RAM and ULA and testing from ...Kempston joystick detectionIn both [url="http://skoolkit.ca/disassemblies/manic_miner/asm/34252.html#34332"]Manic Miner[/url] and [url="http://skoolkit.ca/disassemblies/jet_set…
... (or compatible) joystick interface is not present, reading IN 31 dec ... to be on the ULA / "lower" RAM bus during the screen video ...Spectrum preservation/clean up questions.I’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…
... voltage generation circuitry for the lower RAM.
128K models use ... 4164/4464 RAM which only needs the +5v ... in these cases it's not as critical unless some are ...Smokin... more 48k woesHi, it looks like I've converted another Spectrum 48K+ into a smoke machine. I'd been rebuilding an Opus Discovery unit and everything looked good. …
... 's RAM replacement module only uses +5V. It does not need ... the relevant pins of the "lower RAM" sockets if the Spectrums on ... . Although Zorn's RAM replacement module does not need these supplies, ... . Without this voltage, it will not work.
[B][I ...Smokin... more 48k woesHi, it looks like I've converted another Spectrum 48K+ into a smoke machine. I'd been rebuilding an Opus Discovery unit and everything looked good. …
... 's RAM replacement module only uses +5V. It does not need ... the relevant pins of the "lower RAM" sockets if the Spectrums on ... . Although Zorn's RAM replacement module does not need these supplies, ... . Without this voltage, it will not work.
[B][I ...Issue with Issue Two[img]https://dl.dropboxusercontent.com/u/25300140/Spectrum/Edited_ImageEasyImageEditor_20141111_84.jpg[/img] I'm working on an Issue Two that was sh…
... describe to work in a lower RAM position to see if it ... ), however working 4116's are not hard to find.
lower RAM modules if that was the ...Issue with Issue Two[img]https://dl.dropboxusercontent.com/u/25300140/Spectrum/Edited_ImageEasyImageEditor_20141111_84.jpg[/img] I'm working on an Issue Two that was sh…
... describe to work in a lower RAM position to see if it ... ), however working 4116's are not hard to find.
lower RAM modules if that was the ... be done but Zorn's lower RAM board is probably the best ...ZX SPECTRUM REFURBHi, I have an old ZX Spectrum here that I want to fix up cosmetically, the machine seems to be fully operational so I wouldn't want to mess around in…
... . In 16/48K Spectrums the lower RAM ICs could well be destroyed ... the case; this is often not an easy thing to do ... of the early types is not as fast.
Some ... on the case and was not able to find any that ...ZX SPECTRUM REFURBHi, I have an old ZX Spectrum here that I want to fix up cosmetically, the machine seems to be fully operational so I wouldn't want to mess around in…
... mat into soapy water might not be the best thing to ... of one could destroy the lower RAM and that would require much ...ZX SPECTRUM REFURBHi, I have an old ZX Spectrum here that I want to fix up cosmetically, the machine seems to be fully operational so I wouldn't want to mess around in…
... mat into soapy water might not be the best thing to ... of one could destroy the lower RAM and that would require much ... heavy use, so I might not replace any of the innards ...ZX SPECTRUM REFURBHi, I have an old ZX Spectrum here that I want to fix up cosmetically, the machine seems to be fully operational so I wouldn't want to mess around in…
... could (and does) take out lower RAM, as others have mentioned. The ... being a very bad idea not so long ago :) Later issues ...Issue with Issue Two[img]https://dl.dropboxusercontent.com/u/25300140/Spectrum/Edited_ImageEasyImageEditor_20141111_84.jpg[/img] I'm working on an Issue Two that was sh…
So, not a total waste then perhaps. :) The modified 4164s take care of the job as the lower RAM quite well, and pretty good value too as they were only 50 cents a piece. I do have to admit that soldering the jump wire for the +5V on each chip was a b***h.48K Upper memory issues?Having more issues with the 48K spectrum I just fixed that had the black screen in this thread [URL="http://www.worldofspectrum.org/forums/showthread…
... on the screen. Replaced faulty Lower Ram IC (IC8)
Now black ... put in on the lower ram chips were not making good contact with ... and peek memory test, but not all of the memory was ... from his page but have not been able to load it ...48K Upper memory issues?Having more issues with the 48K spectrum I just fixed that had the black screen in this thread [URL="http://www.worldofspectrum.org/forums/showthread…
... have bad upper RAM, you think your lower RAM is fine but ... two and you're not convinced the ULA is ... start!
Lower RAM: Since you only THINK it ... when if fact you do not. Test for short circuits ... fit one of Zorn's lower RAM boards, just to eliminate ...48K Upper memory issues?Having more issues with the 48K spectrum I just fixed that had the black screen in this thread [URL="http://www.worldofspectrum.org/forums/showthread…
I rather suspect the lower RAM test failed because of IC16 ... -operate with any other upper RAM types. All eight can also ... upper RAM module that I sell, but that's probably not the ...Non-Ferranti ULA 6C001E-7?Hello! I don't like Iss2 boards that much but after revising one Speccy like that for a friend, the results were so positive that I decided to have …
... and has had all new lower RAM (not by me though), but appears ...48K Not booting properlyBought another faulty spectrum from Ebay. 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…
... spectrum.[/QUOTE]
Not if it initialised as ... strongly suggest an upper RAM fault. If you had ... the contents of the lower RAM still occured, most probably ... an upper RAM IC is interfering with ... line at the upper RAM with an oscilloscope often ...Dodgey R62 / D16 on Issue 2?Hello all, 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 som…
... 137... I checked all voltages (lower ram, all ICs, ULA/CPU etc ... screen at 39/40 (and not 35), I can't get ... it the black image does not appear during tuning.
Dodgey R62 / D16 on Issue 2?Hello all, 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 som…
... 've got one ore more lower RAM IC's to replace, along ... fixed, but this one may not be viable :(
BNewbie with a faultHi 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 i…
... supply failure (the RAM chips that provide the lower 16K of memory ... one or more of the lower RAM chips (these are at the ... new ones. A modern replacement lower RAM board is also available if ... as best we can. If not, there are plenty on here ...Newbie with a faultHi 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 i…
... it be the Cpu and lower ram for instance, or Cpu and ... to get if you happen not to be in China :) ).< ... the display is static and not moving, the -5V line ... aware though, it's possibly not the CPU - 95% of ... CPU is socketed or not, and whether or not it's fallen ...128K RAM tester as .TAP?I was sure that I've seen a RAM tester that can be loaded with e.g. DivIDE or DivMMC EnJOY! as .TAP. But I can't find it (been searching through the …
... to run from the lower 16K of RAM, so as such it ... work reliably if lower RAM is good, and upper RAM is not damaged to ...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…
... a fail then
Lower ram tested on 200Kohm range
not IC 3 and 4 ?
Upper ram socketed< ... />
Test the voltages dude, not the resistance. If you really ... .
Partially socketed RAM sections usually mean the computer ...Zx spectrum 48+ help pleaseI have just had a look at my spectrum 48+ and I get this [IMG]http://fbcdn-sphotos-h-a.akamaihd.net/hphotos-ak-xfa1/v/t34.0-12/10965632_101526175830…
... the most common fault of lower RAM not working properly. This could be ... of one of more faulty lower RAM ICs or because the voltage ... voltages at one of the RAM ICs. You'll find the ...The Spectrum Resuscitation ThreadKicking 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…
... thing for it, solder in lower RAM and ROM sockets, and go ... molex sockets
- Install upper RAM sockets and IC's
not clean enough (I removed a ... excess solder from it, but not all as I ran out ...
