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Issue 2 crashes after about 30 minsHi Guys, I have an Issue 2 zx spectrum that seems to get graphic corruption after about half hour of playing, then finally falls over and crashes. …
... .
Even on later issue Spectrums (which have the heatsink ... , I left my Spectrum (a issue 3 IIRC) on for many, many ... -
Serious SpectrumHas anyone here used their Spectrum for anything other than gaming and programming back in the eighties? I see all these business and productivity ap…
... years and it was a Issue 3 motherboard. I will take some ... -
ULAs interchangeable across issuesHi all, Now that I'm retired, I'm looking again at 8 bit computing :) I'm attempting to revive a spectrum 48K. I'm going to swap chips in/out from…
Chris Smith's book has a whole chapter on ULA versions.
According to the book the transistor modification was still required on the issue 3 ULA and there were some resistor changes on the PCB for the new ULA. -
ULAs interchangeable across issuesHi all, Now that I'm retired, I'm looking again at 8 bit computing :) I'm attempting to revive a spectrum 48K. I'm going to swap chips in/out from…
... board on the issue 3 board onwards, so an issue 2 board requires ... -
Hardware description - PLUS D interfaceThis new thread will contain onformations of different ZX devices. Some devices contain manuals, schematics or firmware for some chips, but some peop…
... be DISCIPLE, MULTIFACE 1, MULTIFACE 128, MULTIFACE 3, DIVIDE, DIVIDE PLUS, DIVMMC ... , BETA DISK 48, BETA DISK 128, BETA ... -
No sound from speaker.Help! My trusty 48k has stopped giving me sound out of the speaker. It does however give me sound from the EAR socket. I've tried swapping the spea…
Assuming issue 3 or above:
test the transistor TR7 - ZTX 450
It's ok to replace with a ZTX 650 ;) If that fails, the speaker is probably toast. -
Spectrum Serial Numbers Wanted!![b]This post updated Sept. 26, 2013[/b] As far as I know, the serial numbering system for the Spectrum has never been fully worked out. For the p…
Hope I'm doing this right.
48K Issue 3
Serial (green): 001-564512
CPU SGS Z80A 28423
ULA 6C001E-6 8340 -
Possible dodgy +2 - resets when loadingSo I have a grey model +2 with a recently refurbed tape deck (new belts and cleaned heads). It might be a product of bad loading, but from what I ca…
Wanted: broken motherboard!Does anyone have a motherboard for a 48k (any issue) that is currently not working? I'm looking to set up a test board for chips, and would like to g…
... motherboard for a 48k (any issue) that is currently not working ... ).
I use a 48K issue 3 board for 4116 chip testing ...48k of my youthSooo, So I finnaly had a few minutes to spent around in the 48k. I opened the box for a quick inspection, mainly to check on the version and to see…
... /> It seems to be a Issue 3 (anyone care to confirm it ... think it says "(c) 1983 Issue 4", but I can't ...48k of my youthSooo, So I finnaly had a few minutes to spent around in the 48k. I opened the box for a quick inspection, mainly to check on the version and to see…
... think it says "(c) 1983 Issue 4", but I can't ... , it's a Issue 4B. The difference to Issue 3 seems to be ...Push 'n' ChaseIt is my great pleasure and honor to announce the release of PUSH 'n' CHASE a game made with CGD featuring a wonderful loading and intro screen …
... my newly found zx Spectrum (issue 3) but i would bve thrilled ...Interface 1bisHas anyone on here got a "Interface 1bis": [URL="https://sites.google.com/site/interface1bis/"]https://sites.google.com/site/interface1bis/[/URL] I …
I'd have just had people put a copy of the ROM on the SD card themselves. Cloning the BASIC ROM from the machine might cause issues with the 128 and +3 versions of BASIC, or they might not.Interface 1bisHas anyone on here got a "Interface 1bis": [URL="https://sites.google.com/site/interface1bis/"]https://sites.google.com/site/interface1bis/[/URL] I …
... might cause issues with the 128 and +3 versions of BASIC, or ...Sinclair Serial Numbers - What have we learnt so far.So JakeyW has been collecting our serial numbers for a while now. What are we learning from this that we did not know before hand? Also, would it n…
005- is probably issue 3 - you can find out by ... see the heatsink it's issue 3 or later.
Are ...Spectrum Serial Numbers Wanted!![b]This post updated Sept. 26, 2013[/b] As far as I know, the serial numbering system for the Spectrum has never been fully worked out. For the p…
... this right.
48K Issue 3
Serial (green): 001-564512 ...New multi-interface for ZXI have in development new interface for ZX Spectrum. PCB size is similar as K-MOUSE interface and on board is CPLD (programmable logic), up to 1MB st…
Would it be possible to support 32K or even 64K external ROMs using the standard 128 or +3 paging?New multi-interface for ZXI have in development new interface for ZX Spectrum. PCB size is similar as K-MOUSE interface and on board is CPLD (programmable logic), up to 1MB st…
New multi-interface for ZXI have in development new interface for ZX Spectrum. PCB size is similar as K-MOUSE interface and on board is CPLD (programmable logic), up to 1MB st…
... does the MB02+ support 128 or +3 style paging. For instance would ...New multi-interface for ZXI have in development new interface for ZX Spectrum. PCB size is similar as K-MOUSE interface and on board is CPLD (programmable logic), up to 1MB st…
[QUOTE=aowen;729635]But does the MB02+ support 128 or +3 style paging. For instance would you be able to use the +3e ROMs?[/QUOTE]
You can use any custom rom or enable rom rewriting. +3e rom may be. Or ZX128 rom on +2A/+3, etc...Issue 3 board with strange piggy-back boardIn case you are interested. I?ve never seen something like this before. I have an Issue 3 board here. When I opened the case and found a strange pig…
Mate, we all know what a Spectrum issue 3 board looks like.
We need the underside (or bottom side if you prefer) of the Logitek board!
And since you're at it, a better close-up of the top side wouldn't hurt...POKEs on 128K "upper RAM"?I've been working lately with some 128k games, and I've got this question about RAM in games. I guess most games use RAM pages 5 and 2 to store the …
The Multiface 128 & Multiface 3 had an option to select which RAM bank was paged in to the top 16kb. Although I don't recall ever seeing any game POKEs where that needed to be done.I've had better nights...So I got a broken issue 2 today, case in good nick but the diags board showing multiple failures in both lower/upper RAM. Never mind, good as a spare…
... luck today and repair one issue 3 for ten minutes :), I have ... check of voltages get me +3.5v on lower ram, change ...Spectrum Missing -5vMy Spectrum is "almost" booting, just when you expect the (C) 1982 Sinclair Research to appear it just displays flashing squares on the screen :( I …
Is your board an issue 3 or an issue 3B? Are there ... resistor R55 for an issue 3 or resistor R79 for ... an issue 3B.
... diode (D16 for issue 3, or D19 for issue 3B) is short ... ] says, a faulty C46 (issue 3 and issue 3B).
...Spectrum Missing -5vMy Spectrum is "almost" booting, just when you expect the (C) 1982 Sinclair Research to appear it just displays flashing squares on the screen :( I …
... original rubber key 48k Spectrum issue 3
Any help or ... /dried C46. Just resurrected an issue 2 with exactly the same ...Video failureHi i cant find the failure of my spectrum 48k issue 4a, i thought it was ic6 or ic13 but the memory seem to have the right values. When i turn it on…
I just had a case recently where an Issue 3 showed the lower half of the screen only, but twice ?!? Finally replacing the ULA fixed the problem.Two more faulty onesCould I get your opinion on these two faults, please? Understanding these two cases would be very beneficial for my ZX education. Thanks! - A Spectr…
... had been applied to the issue 2 5C112E ULA and altered ... ]Chapter 24. ULA Versions, section "Issue 3 ULA 6C001E-6", p.251 ... /> [/RIGHT]
[/QUOTE]So any issue 3 machine and up will exhibit ... this shift compared with issue 1/2 Spectrums.
"Press any key" detectionWhat would be the simplest way to detect if *any* key is being pressed? No LAST_K trickery, I can't rely on that. It has to be reading the keyboard p…
[QUOTE=aowen;735032]The Timexen return 95 on IN 254 when no key is pressed. Not sure what issue 2 machines do.[/QUOTE]
I'm getting 31 on my TS2068s.
The issue 2 returns 255, the issue 3 returns 191.Spectrum 48k membraines & key metal cover :)As per title, what the best place to get these from ? I need 2 of each for the rubber keyed speccy :) Thanks OttO
... couple of my newly-refurbed Issue 2:
[IMG]http ... ]
I've an Issue 3 that I got a couple ...
