-
Schematic ErrorThere appears to be an error in the Schematic for the 128k +2A and +3 the error is present in both the redrawn TIF version and the original drawing …
There appears to be an error in the Schematic for the 128k +2A ... and +3
the error ... looking at my +3's board I noticed a weird circuit ... -
Schematic error.. (?)Hi, I was browsing this page: [URL="http://microhobby.speccy.cz/150203/hardware/bus.html"]http://microhobby.speccy.cz/150203/hardware/bus.html[/URL]…
... noticed that the schematic of the 'fixer' has an error (or am ... -
Spectrum 48k Issue 4S?I just recieved a Spectrum 48K that had the bottom case from an issue 1 and the top half from a later issue, and the main board is 1983 Issue 4S. I a…
I just recieved a Spectrum 48K that had the bottom case from an issue 1 and the top half from a later issue, and the main board is 1983 Issue 4S. I am curious in what way it differs, as there are no schematic for issue 4S on this site. -
48k packed up after cap changeHi all, I'm relatively new to the Sinclair world, my 8-bit repairs in past was lurking in the dark sides of Acorn, Amstrad and Commodore! I've got…
... which I believe is an issue between the Z80 and the ... open circuit on the board. However, only the issue 6A now works ... /> [*]Print out a schematic for the relevant issue board, then check that you ... on some issue boards, there is a screen print error for one ... -
48k packed up after cap changeHi all, I'm relatively new to the Sinclair world, my 8-bit repairs in past was lurking in the dark sides of Acorn, Amstrad and Commodore! I've got…
... /visible bad traces on this board are all in the lower ... /> "Print out a schematic for the relevant issue board, then check that you ... on some issue boards, there is a screen print error for one ... -
Wanted Issue 1 32K DaughterboardBit of a long shot i know but original or if anyone can make one i got cash waiting. [IMG]http://img.photobucket.com/albums/v322/Sloposse/Sinclair/s…
OK issue 1 gone on sale tonight ... />
anyone got a schematic for the board ?
EDIT ... -
4116 DRAM for 48KSomeone told me I got faulty RAM in my broken 48K. They should be 150ns, right? What would be a good place to buy them from?
... try to post a full schematic ASAP. It's just that ... particular SRAM, a particular Spectrum issue board, and a particular version ULA ... if it works for other issue boards, or other version ULA ... -
Keys don't work even with new membrane, HELP!Hi folks. I have a 1983 48k Zx Spectrum. It powers up fine, but none of the keys respond. I have tried fitting a new keyboard membrane from rwap, but…
... right, you can test the board like he says. If you ... . You'll need the schematic for the board you have in question ... , but you probably have an Issue 2 board, so here's the ... the diode number off the schematic) in case the solder joint ... -
SRAM replacement for lower 16KSome time ago I wondered if it were possible to replace the lower 16K RAM of a 16K/48K Spectrum with a single SRAM chip. You know, those pesky 4116 D…
... on a separate (experimentation) board. In that case, place ... everything directly on the Spectrum board. Construction should be easy, ... . Just check the schematic of your issue board, and find the ... parts on the board. They're ... -
ZX Spectrum 48K AV IssueOK so I dugout my old 48K Speccy today and decided to AV mod it. I did the mod (pretty easy) but the picture I am getting is this. [url=http://posti…
... just noticed that the schematic for the issue 4A/4B has a ... ! The error is in the issue 4B part of the schematic, the issue 4A ... -
Next step for fixing my speccy?Hi guys, I've picked up my faulty Spectrum aiming to fix it. So I followed the excellent JouledperCoulomb videos on Youtube for the basics and I am …
... the schematic for the on board switching power supply for some board issues ... ...
Careful as the same issue board may have been modified... The ... issue number is not reliable in ... -
Harlequin Rev G - Decoupling Capacitors?Guys - I started assembling my Rev G Harlequin board over the weekend. Right after I picked it up and started loading parts, it struck me that there…
... design into an autorouter). That board probably worked more than 90 ... board because that's where the designer put them on his schematic ... , and that board [i]mostly[/i] ... worked. So, maybe there is no issue ... -
ZX Spectrum 48K Issue 4B No soundHi, I have a ZX Spectrum 48K Issue 4B without sound. I tested the ULA on another Spectrum and works fine, tested the speaker and it has the correct …
... D9 on the issue 4A / 4B schematic.
On the board, it should ... -
48K Rubber Keyboard Membrane WantedHi i opened my spectrum up for the first time since i bought it because i was trying to find out which issue board i have (issue 3B) and shock horror…
... to find out which issue board i have (issue 3B) and shock horror ... -
New Collector Advice NeededI have just started by quest to collect Sinclair computers. Is there a way to tell anything useful from the spectrum serial number? Does it indicate …
ZX81 Question?Just bought a ZX81 on Ebay (as you do). It was sold as not working, but once I'd changed the fuse in the plug on the transformer it was working like …
... surprised it's a 1980 issue board, and the processor has a ... 'bodge board' on it, looks like it ... factory.
Its a board with legs on the bottom ... it. What does this little board do?
(The machine ...Reading from the keyboard using the IN commandHi all, I'm working my way through Sixty Programs for the Sinclair ZX Spectrum, and I'm running into difficulties with some of the keyboard reading r…
... different addresses depending on which issue motherboard you have. Could some ... have to read for which issue board?
cheers
ChrisZX Spectrum+ adviceHey all, I just got a ZX Spectrum+ from eBay and I'm not sure yet what to do with it. I wanted to first take a peek inside, see what issue board it i…
... a peek inside, see what issue board it is, and check out ... any way to identify the issue number by other means?
Slightly different rubber keyboardWhile doing a search I came across this picture of a rubber spectrum. [url=https://ibb.co/KqsSD6B][img]https://i.ibb.co/KqsSD6B/image-s-1000x700-8…
... known when or what spectrum issue board came with this rubber keyboard ...Rare????Rare?? VERY rare? ummm....what is exactly rare about this??? [url="http://cgi.ebay.co.uk/Working-Sinclair-ZX-Spectrum-rare_W0QQitemZ8256105857QQcate…
... rare. Is it a rare issue board? has it been modified in ...Issue two picture qualityDoes anyone know if issue two and earlier spectrums have worse picture quality (in general, beside colours) compared to issue 3 and later? I mean on…
... ]Does anyone know if issue two and earlier spectrums ... , beside colours) compared to issue 3 and later?
... br /> I mean on both issue two speccys that i have ... normal for this early issue. Also i want to ... ULA chip from a higher issue board - the ULA's do ...128k dead, no TV signalI got 128k spectrum (heatsink model) from a friend of mine. He told me that speccy is dead, and he doesn't know what's wrong with it. When I plugged…
... other spectrum +128K ( with a issue 9G) that have this ULA ... />
You can see some issue board in:
[url]http ...Does anyone have any working Ferranti's?Does anyone know where I might get hold of a Ferranti ULA5C112E-3?? I think this is the problem with one of my rubber key 48K's as it otherwise wor…
... nose here and see what issue board I can offer as a ...Does anyone have any working Ferranti's?Does anyone know where I might get hold of a Ferranti ULA5C112E-3?? I think this is the problem with one of my rubber key 48K's as it otherwise wor…
... nose here and see what issue board I can offer as a ...New Collector Advice NeededI have just started by quest to collect Sinclair computers. Is there a way to tell anything useful from the spectrum serial number? Does it indicate …
New Collector Advice NeededI have just started by quest to collect Sinclair computers. Is there a way to tell anything useful from the spectrum serial number? Does it indicate …
... or 48k machine or which issue board it has inside?
issue 1 and 2 boards were ...Unknown ZX81 InterfaceThis interface was part of a lot with some TS1000 and ZX81 computers for parts, among other stuff. Since there are no instructions nor software, I wa…
... in how well the ADC board works given that there's ... lines and make a schematic of the board, you may find it ...Cro S2008Hi everybody!!! I hope this is right thread? :-) I want to share with you my new project. I call it ?S2008?? The idea was to build Spectrum48K clo…
Schematic of S2008 board:
AY Sound ( U22, ...4116 DRAM for 48KSomeone told me I got faulty RAM in my broken 48K. They should be 150ns, right? What would be a good place to buy them from?
Not a schematic but a board layout is on those pages as well:
[url]http://www.zxprojects.com/index.php/simm-adapter-for-replacing-lower-memory/13-making-it-pretty[/url]
Frans:-DReplacement loudspeaker for rubber key 48kI'm fixing one of my rubber key 48k. Just ordered a membrane for it but I also need to find a replacement loudspeaker for it. The original some how q…
... defective loudspeaker on a 4S issue board so i thought i'd ...
