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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 ... -
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 ... -
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. -
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 ... -
Broken or upgraded ZX Spectrum 48kHello First i want to say hello to everybody. I have a new ZX Spectrum 48k in my collection. Seller said that it is broken (no picture). I have this…
... of resistors. That mainboard is issue 3B but it was upgraded ... . I have checked that with schematic for issue 5.
regards ... -
Improving audio?In working on fixing and updating the hardware in my ZX Spectrum 48k, there is one nagging issue. My issue 2 board has crappy sound through the beepe…
Hmm, a buffer transistor, should have thought of that one. Well, you cant think of everything, especially when you been up until 7AM soldering spectrum components LOL.
I will check out the schematic for issue 3 motherboard speccy. -
TommyGun with AGDHi everyone, I have been working with Jonathan to incorporate his excellent Arcade Game Designer utility into TommyGun. Jonathan has created a compi…
... Tommy+AGD too. Same "Build Error" issue. Will try downgrading the version ... -
Floating Point Package Math48<br>I came across a neat little floating point package for the z80 and I'm adapting it now to work with z88dk and sdcc. There is an interesting…
... to correct mistakes. The time issue is especially harmful as any ... therein lies a time / human error issue.To be serious, the only ... -
Floating Point Package Math48<br>I came across a neat little floating point package for the z80 and I'm adapting it now to work with z88dk and sdcc. There is an interesting…
... precision could be a tremendous error for scientific work, i.e ... to correct mistakes. The time issue is especially harmful as any ... therein lies a time / human error issue.[/quote]
Whilst formal methods ... -
Issue 6a SchematicSince a scanner will only get you so far in reproducing a clear image I decided edit the 6a schematic to take the fuzz out. Martin liked result so …
... I decided edit the 6a schematic to take the fuzz out ... so much, he replaced his schematic with my edited version.
I'm now working on Issue 5.
Comments welcome. -
Sinclair User Issue 89 Scan Error!!!Not sure how to link to the magazine scans or even how to get to them directly so this might not be the type of link that youd usually see for a maga…
... missing page in sinclair user issue 89. Page 14 is duplicated ... -
issue 2 board c34 getting hotHi All, Can anyone help with c34 getting hot very quickly? I`ve got an issue 2 board, there is no `buzz` from coil. yet the spectrum initalises to co…
... quickly? I`ve got an issue 2 board, there is no ... . I`ve looked at the schematic and C34 is presumably a ... -
48K Speccy Repair Log.Some people may know my love for writing up my repairs of arcade PCBs on various forums so thought I would do the same for this little fella. Had th…
... low. Looking at the schematic A14 is involved in ... , which cleared the A14 error. With the bus test ... replacing the chip fixed the issue, I originally thought it ... ram test failed with "RAM Error @8000 BTS 8"
... cleared the "BTS 8" error and the Fluke then was ... -
Error in the Schematics.Hi, i have been looking at a Speccy 48 PCB, and have figured out that all the Speccy schematics in the archive up to and including Rev 4a, contain an…
... including Rev 4a, contain an error,
The A15 line ... 27 as shown in the schematic.
This seems to ... corrected in the Rev 5 schematic.
Probably worth noting ... -
Persistant tape loading error*big cheery wave* Got myself an ebay 48k rubber key speccy recently. Seems to be working ok, excpept for tape loading errors. Tried from a few sour…
... of the loading sequence, then error.
Skool daze loads ... see if its a memory issue, but same thing. Gets to ... loading sequence, then pops the error up.
As far ... -
Intermittent reset on 48K (issue 4S)I'be been fighting an intermittent selfreset the whole day. Changed ULA - did not help. Tested TR6 as i could and compared the reading with another…
... get a "r tape loading error" i guess.
Memory ... a loading issue (always gave me R tape loading error) until i ... -
Issue 2 Failed 48k to 128k upgradeI have been trying to upgrade my Issue 2 with the help of Velesoft, using this schematic; [IMG]http://i764.photobucket.com/albums/xx284/arioch1973/4…
DIY Issue 1 Internal 32K RAM expansionFollowing on from the information in [URL="http://www.worldofspectrum.org/forums/showthread.php?t=40173"]this[/URL] thread, I finally figured this ou…
... a stripboard version of the Issue 1 internal RAM module.
Issue 1 board are available from ... addressed. Here's a basic schematic (part numbers are surface mount ...I broke my 48k Speccy!!!!Hey guys, I am looking for some advice, I hope you can point me in the right direction. So, I went about replacing all the capacitors on my issue 4…
... the capacitors on my issue 4b board. This is ... time before without any issue on other 48k's ... not ruling out an error in my working whilst ... , placement or component capacity error, or other defect that ... Why does the 4b 48k schematic only show micro farad specs ...Spectrum +2 (grey) RAM issueHi, I?ve got a ZX Spectrum +2 (grey) with what I think is a RAM issue. I used to be able to load games very reliably by playing converted TAPs and …
... I think is a RAM issue.
I used to ... with an R Tape Loading Error. I quickly got fed up ... RAM page 5 has an issue.
Here?s a ... same time? It's an Issue 3 PCB.
[I ... being incorrectly mounted on the Issue 3 PCB. I can't ...Issue 1 schematics?I'm fault-finding an issue 1 board. So far I've found a hot memory chip and snipped it's supply legs, then swapped the burnt-out 7805 for a switched…
I'm fault-finding an issue 1 board. So far I' ... if anyone knows of a schematic, that would greatly help.Spectrum issue 4SI have an almost completely depopulated issue 4s board. Wondering what to do, repairs or spares? I hooked it up and the voltages are off, 5v is fi…
... have an almost completely depopulated issue 4s board. Wondering what to ... to find a schematic and layout. The 4ab schematic is similar but ...bizarre error on a grey ZX Spectrum+2 - the long search for a small problemHi, I got a ZX Spectrum+2 that worked a bit but crashed while loading or running 128k games. I installed a 128k-test-ROM that told me about RAM fa…
... and installed new RAMs. The error remained. Then I removed the ... ROM did not find any error, even the RS232 and keypad ... its 9V input the known error remained - Buzzsaw did not run ... text here mention to an issue 3 board of a grey ...Kempston interface schematic: wrong IC?Hi! I'm trying to learn about the inner workings of the speccy, and I thought that building a kemspton interface would help me learn about things lik…
... /> I'm considering using this schematic, as it looks like something ... this an error in the schematic? I see another schematic that uses a ...No CLK on issue 2 ULA pin 32I'm trying to fix an issue 2. The symptoms are as follows:- Black and white bars on screen, colours near impossible to tune in, although these po…
... 'm trying to fix an issue 2.
The symptoms ... /> I'm looking at the schematic and starting to suspect the ...Replace Issue 2 speakerI was wondering as the speaker in an issue 2 speaker is 200 ohms, would swapping a 40 ohm later spectrum speaker in help with tape loading, less load…
... as the speaker in an issue 2 speaker is 200 ohms ... the circuitry to match what issue 3 schematic, which should make game ...ZX Spectrum Issue 4S composite video fuzzy (horizontal blur)Dear people of WoS, Thank you very much for taking the time to read. I have an Issue 4S I recently acquired and planned to fix up as a gift for a…
... to read. I have an Issue 4S I recently acquired and ... a friend.
The issue:
Composite video out on ... for 23 12vac shown on schematic?) : -5.175v (20), 11.64v ...Fuller FDS Keyboard schematicAnyone have a schematic for that? Mine is randomly triggering BREAK on powerup or Symbol Shift in BASIC. I guess it comes down to one of the CD4016 …
Anyone have a schematic for that?
Mine is randomly triggering BREAK on powerup or Symbol Shift in BASIC. I guess it comes down to one of the CD4016 having gone bad, but a schematic would certainly help pinpointing the issue.48k issue 4B display problem etchi,, i have a zx spectrum 48k issue 4B with a display issue it has wavy lines in both the border and paper,some colours seem worse than others ie red…
... zx spectrum 48k issue 4B with a display issue it has wavy ... composite mod with the same issue.. i have tried everything short ... for hours never has any error..checked resistors etc _5v,12v ...Wanted 10 - 4116 Ram ChipsHi Can any one help I am trying to get hold of 10 4116 RAM chips for a 48K Spectrum. Does any one know who might stock them. I can get a minimum of …
... that my Issue 3B rubber keyed Speccy contains a memory error.
Issue 3B Schematic along with [url=http ...
