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ZX mask ROM chips curiosityJust out of curiosity... what willl happen if we have a Hitachi ROM and the bridging onboard is on the N positions (for NEC)? While I was searching …
... we have a Hitachi ROM and the bridging onboard ... on the N positions (for NEC)?
While I ... issue that was set for NEC rom but the chip (socketed) ... fine, and passes the ROM test on the Sinclair testing ... of the factory, no rom has been replaced and no ... -
Stealth AllRAM SpectrumHaving just received a couple of new keyboard membranes to fix a couple of machines with, the thought crossed me that I should do a special project w…
... machines with the OpenSE ROM (or similar ROM which tokenizes).
ROM has the same pinout ... enable on the ROM. Both the ROM's chip enables ... - so basically, the ROM itself combines the /ROMCS ... General Instruments or a NEC ROM, in the case of ... -
ZX Spectrum clock signals comparedI haven't searched for this on WoS; it might have been posted before. But I think it's important info, and can't do any harm to repeat or show from a…
... ZX Spectrum 48K with unmodified NEC rom: OK (DivIDE with ESXDOS fails ... ZX Spectrum 48K with other rom: OK
- 3x ZX Spectrum ... -
Fully refurbished ZX Spectrum 48K boards incl. ULA- Including ULA (version that [URL="http://www.bytedelight.com/?p=41"]corresponds to the board issue[/URL] - click to find out more about ULA version…
...
- Tested with DivIDE (performed NEC ROM fix if needed)
- Tested ... -
divIDE interface not workingA while ago I bought a divIDE interface for my two spectrums (one is a 48k rubber keyboard one, the other is a 48k Spectrum plus). Sadly I never actu…
... noticed that apparently spectrums with NEC ROMs have issues with the ... my Spectrums sadly have a NEC ROM. So I followed this guide ... /> http://benophetinternet.nl/hobby/vanmezelf/NEC%20ROM%20fix%20for%20the%20DivIDE ... -
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…
... Z80A 8213 Modulator 8226, NEC memory chips with no datecode ... 8223 Z80A 8213 Mod 8226,NEC memory chips with no ... 050109 ?21 (modulator 8218,NEC ROM 8219,others 8213,8226,8227 ... 5C102E 8233 no sale 290908 (NEC ROM 8222, memory 8227) relisted 021008 ... -
Earliest ULA datecode ??I'm on a mission to find the earliest ULA datecode. Ie, when the first batch of ULA's were manufactured. The earliest picture of the Spectrum circu…
... Z80A 8213 Modulator 8226, NEC memory chips with no datecode ... 8223 Z80A 8213 Mod 8226,NEC memory chips with no ... 050109 ?21 (modulator 8218,NEC ROM 8219,others 8213,8226,8227 ... 5C102E 8233 no sale 290908 (NEC ROM 8222, memory 8227) relisted 021008 ... -
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…
... /> ULA 6C001E-6
Hitachi ROM
Board issue 3B
ULA 5C112E-2
Hitachi ROM
Board issue 2
ULA 6C001E-6
NEC ROM
Board issue 2
ULA 5C112E-3
NEC ROM
Board issue 2
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…
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…
Issue 3
Green writing
001-511113
ULA: 6C001E-6
Bad M1 line on non-socketed NEC ROM
UM1233 E36 ModulatorSpectrum 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…
No video in Spectrum 128k +2A Grey[B][COLOR="red"]EDIT: 26-05-2012 = Thread topic edited[/COLOR][/B] Hi everyone, Recently i won a Spectrum 128k +2A Grey at ebay UK. The Spectrum …
... (my friend CPU is a NEC), ROM's and no way to ...Another cause for DivIDE problems on 48K'sThe last months some topics were opened to discuss problems with 48K ZX Spectrums and DivIDE. Sofar we found: - Bad Z80's because of poor fanout (si…
... /> So I'm sure the rom is one of the incompatibility ... a bit more concrete: all NEC roms failes, the Sinclair ones ... out, people who have a NEC rom and problems with DivIDE, can ...Another cause for DivIDE problems on 48K'sThe last months some topics were opened to discuss problems with 48K ZX Spectrums and DivIDE. Sofar we found: - Bad Z80's because of poor fanout (si…
... as replacement for the rom. Simply added an Or ... complex solution for original rom, to feed the right ... (pin 22) of the NEC rom, using two NOR gates: ... we know now that the NEC rom is causing DivIDE incompatibility, ... of the rom (that is /CS on the NEC rom) is ...Another cause for DivIDE problems on 48K'sThe last months some topics were opened to discuss problems with 48K ZX Spectrums and DivIDE. Sofar we found: - Bad Z80's because of poor fanout (si…
... , and the DivIDE conquers the NEC rom 8)
[IMG]http ... junction to /OE of the rom; pin 22.
Of ...Another cause for DivIDE problems on 48K'sThe last months some topics were opened to discuss problems with 48K ZX Spectrums and DivIDE. Sofar we found: - Bad Z80's because of poor fanout (si…
... the input buffer (inside the ROM chip) as '0'. This isn ... check if there is a NEC rom inside the Spectrum and BC337 ...Another cause for DivIDE problems on 48K'sThe last months some topics were opened to discuss problems with 48K ZX Spectrums and DivIDE. Sofar we found: - Bad Z80's because of poor fanout (si…
... , and the DivIDE conquers the NEC rom 8)
/RD and ... junction to /OE of the rom; pin 22.
Of ...Another cause for DivIDE problems on 48K'sThe last months some topics were opened to discuss problems with 48K ZX Spectrums and DivIDE. Sofar we found: - Bad Z80's because of poor fanout (si…
Another cause for DivIDE problems on 48K'sThe last months some topics were opened to discuss problems with 48K ZX Spectrums and DivIDE. Sofar we found: - Bad Z80's because of poor fanout (si…
Another cause for DivIDE problems on 48K'sThe last months some topics were opened to discuss problems with 48K ZX Spectrums and DivIDE. Sofar we found: - Bad Z80's because of poor fanout (si…
So only divIDE is not working on these NEC ROM machines ?
Spectranet/Interface 1 work ok ?
I will check on my NEC ROM ZXes, but I have only divIDE that uses M1.Another cause for DivIDE problems on 48K'sThe last months some topics were opened to discuss problems with 48K ZX Spectrums and DivIDE. Sofar we found: - Bad Z80's because of poor fanout (si…
... is not working on these NEC ROM machines ?
Spectranet/Interface 1 ... /> I will check on my NEC ROM ZXes, but I have only ... every 48K ZX Spectrum with NEC rom.Another cause for DivIDE problems on 48K'sThe last months some topics were opened to discuss problems with 48K ZX Spectrums and DivIDE. Sofar we found: - Bad Z80's because of poor fanout (si…
... DivIDE on some of my NEC-equipped computers too.
... a ZX Spectrum with NEC rom does not boot properly ... is that probably the NEC rom enters a power saving ... out from. The Hitachi rom does not have this ... the output enable from the NEC rom to ground, so it ...Another cause for DivIDE problems on 48K'sThe last months some topics were opened to discuss problems with 48K ZX Spectrums and DivIDE. Sofar we found: - Bad Z80's because of poor fanout (si…
... ]I encounter problems on every NEC rom inside the ZX Spectrum.
NEC and vv. during your experiments ... : H jumpers= Hitachi, N jumpers= NECAnother cause for DivIDE problems on 48K'sThe last months some topics were opened to discuss problems with 48K ZX Spectrums and DivIDE. Sofar we found: - Bad Z80's because of poor fanout (si…
Checked it: the test board I'm currently using has the wires set to 'N'.
But I'm sure I tested it on other boards too.
Every board with a NEC rom I had in hands had troubles with the DivIDE 57c.Another cause for DivIDE problems on 48K'sThe last months some topics were opened to discuss problems with 48K ZX Spectrums and DivIDE. Sofar we found: - Bad Z80's because of poor fanout (si…
... />
Every board with a NEC rom I had in hands had ...Another cause for DivIDE problems on 48K'sThe last months some topics were opened to discuss problems with 48K ZX Spectrums and DivIDE. Sofar we found: - Bad Z80's because of poor fanout (si…
... that both had the NEC D23128C 057 rom soldered on them.
NEC rom) and I'm talking more ...Another cause for DivIDE problems on 48K'sThe last months some topics were opened to discuss problems with 48K ZX Spectrums and DivIDE. Sofar we found: - Bad Z80's because of poor fanout (si…
... that both had the NEC D23128C 057 rom soldered on them.
NEC rom) and I'm talking more ... problems on any machine with NEC rom together with my 57c's ... that causes this incompatibility with NEC roms?
I should ...Another cause for DivIDE problems on 48K'sThe last months some topics were opened to discuss problems with 48K ZX Spectrums and DivIDE. Sofar we found: - Bad Z80's because of poor fanout (si…
... .
The combination of NEC rom together with an adapted FATware ... .12a works perfectly with the NEC rom!!
But please verify this ... ESXDOS to work with a NEC rom.
Can someone please try ...Another cause for DivIDE problems on 48K'sThe last months some topics were opened to discuss problems with 48K ZX Spectrums and DivIDE. Sofar we found: - Bad Z80's because of poor fanout (si…
... out on a 48k with Nec rom, when I find the time ...Another cause for DivIDE problems on 48K'sThe last months some topics were opened to discuss problems with 48K ZX Spectrums and DivIDE. Sofar we found: - Bad Z80's because of poor fanout (si…
... .
The combination of NEC rom together with an adapted FATware ... .12a works perfectly with the NEC rom!!
But please verify this ... ESXDOS to work with a NEC rom.
Can someone please try ...
