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Half dead divIDE helpHi. My divIDE boots up fine but nothing comes up when I press its NMI button. The button was tested and is ok. Any advice?
... Spectrum may have a faulty M1 line - in which case you need ... -
Half dead divIDE helpHi. My divIDE boots up fine but nothing comes up when I press its NMI button. The button was tested and is ok. Any advice?
... Spectrum may have a faulty M1 line - in which case you need ... others known to have good M1 lines.
When I ... -
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…
... (signal strength) or a defective M1 line
- Problems with the ZX ... -
Altera CPLD vs Xylinx FPGAI will dig into the world of FPGA's, mainly to find something that can replace one or more GALs for my current and new projects. And it's never bad t…
... INTA bus cycle asserts both M1 and IORQ, and poorly designed ... standard document also states that M1 should be included in the ... contain old Z80CPU with bad M1 line - on this machines can be ... unusable. For example unstable M1 line can make IDE transfer absolutly ... -
Configuration of FPGA coresHi all! Lately a lot of features have been added to the V6Z80p Spectrum core. Most of them are handled (clearly) using ports. Some examples: ULA+, Ti…
... [B]take into account the M1 signal and the RFSH signal ... have just discussed that adding M1 is, in general, a bad ... a Spectrum with a faulty M1 line, if that device doesn't ... really need the M1 line (i.e. it's not ... -
Spectrum +2A/B - CPU affects loading??Hi everybody, Here's something I don't understand. A +2A came in the other day, and it was working fine, but wouldn't load some tapes. OK, thinks I…
... ? Why do CPUs with borderline M1 lines not load 128K games ... />
That's weird... The M1 line is not used at all ... -
Spectrum +2A/B - CPU affects loading??Hi everybody, Here's something I don't understand. A +2A came in the other day, and it was working fine, but wouldn't load some tapes. OK, thinks I…
... /> I too noticed that the M1 line isn't connected, which is ... the chip with the strongest M1 line (the NEC D780C) is the ... -
A new site for an old projectThe 'Interface 1bis' project site has been moved to: [url]https://sites.google.com/site/interface1bis/[/url] In fact, it's not only a simple relocati…
... CPUs that have a faulty /M1 line. It is also unaffected by ... -
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…
... have a faulty Z80 cpu (M1 line), replace it and you'll ... -
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…
... have a faulty Z80 cpu (M1 line), replace it and you'll ... -
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…
It would probably be the m1 line but i'wanted to dream a bit since it's fitted without a socket and I hate desoldering :) -
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…
... say it is not the M1 line in this case: it might ... -
128K Toastrack - bad Z80?My 128K Toastrack works fine, but if I try to use divIDE or M1/128 it does not work. divIDE does not show the boot screen and in both if I push the N…
Sounds exactly like my 48K with a bad M1 line Z80 and DivIDE. -
The Disciple clone... doable?Hi. As a spectrum user in the 80's this was the dream interface all-in-one for me. I have a 48k+ and planning on get a 128K toast-rack later. Anyway…
... 'm thinking of MREQ, RD, M1, A14 and A15 in particular ... /> As I understand it, the M1 line is added into the decoding ... -
The Disciple clone... doable?Hi. As a spectrum user in the 80's this was the dream interface all-in-one for me. I have a 48k+ and planning on get a 128K toast-rack later. Anyway…
... I understand it, the M1 line is added into the decoding ... /> In the 48K, the M1 line comes straight from the Z80 ... Z80 was in the 'M1' state ? which effectively ... />
Blocking M1 for ROM 0 would be ... by trapping execution (assuming M1 is actually used by ... -
The Disciple clone... doable?Hi. As a spectrum user in the 80's this was the dream interface all-in-one for me. I have a 48k+ and planning on get a 128K toast-rack later. Anyway…
... being careful to ensure M1 cycles don't occur ...
[QUOTE]I find blocking M1 in this way the simplicity ... taking M1 and ANDing it with some other line to ... Sinclair had masked the M1 line on the expansion bus ... any case, though, the line from pin 12 of IC6 ... -
Interface 1 bisOk, well the postmans just been and brought with him my new arrival, the Interface 1 bis. So as promised I thought I'd share some initial usage exper…
This interface does not use M1 line. What about games sensitive to standard 48k ROM contents ?
I have to say that price is very attractive for this device, great work ! -
The "best" Z80?What's the best Z80 for Spectrums? I know there are differences between brands (Nec, Zilog, Thomson) and technologies (CMOS, NMOS), so what Z80 woul…
... thread I read about faulty M1 signals, which affects the operation ... Z80's have the "strongest" M1, and Zilog having a weaker ... CPU have often problem with M1 line. But as I know Zilog ... CPU don't have bad M1 -
The "best" Z80?What's the best Z80 for Spectrums? I know there are differences between brands (Nec, Zilog, Thomson) and technologies (CMOS, NMOS), so what Z80 woul…
[QUOTE=velesoft;691696]Yes, Zilog Z80 NMOS CPU have often problem with M1 line. But as I know Zilog Z80 CMOS CPU don't have bad M1[/QUOTE]
Is there any way to distinguish among NMOS and CMOS Z80? -
Setting up an IDE HDD on the +3e helpHello, Just installed a HDD in my +3e (ROM ver. 1.11). When turning on it takes a few seconds longer but then shows 2 IDE (available) as well as 1 fl…
... , in the original schematics, the M1 line goes to pin 11 on ... on the updated schematics the M1 line goes to pin 10 of ... -
2013 projects: new PlusD, DivIDE and MultifaceI have written about this before, but as I want to let these project be influenced by your opinions, I thought to create a separate topic about it. …
... alternative Basic ROMs. With faulty M1 line you can do nothing with ... -
+2 Grey NMI problemMy shonky old +2 has always worked very well until recently, ive found that hitting the nmi button on my multiface will either do one of three things…
... Z80 inside (and an external M1 line). A faulty Z80 may appear ... -
+2 Grey NMI problemMy shonky old +2 has always worked very well until recently, ive found that hitting the nmi button on my multiface will either do one of three things…
Is there a way, without an oscilloscope, to test the M1 line on the Z80? -
+2 Grey NMI problemMy shonky old +2 has always worked very well until recently, ive found that hitting the nmi button on my multiface will either do one of three things…
... an oscilloscope, to test the M1 line on the Z80?[/QUOTE]
M1 line via a LED (keep in ... -
ZX Interface 1 Odd ProblemI have just upgraded a rubber key ZX Spectrum (issue 3) to a ZX Spectrum+. Oddly, when used with a ZX Interface 1, CAT 1 produces a question mark. T…
... 1 does not need the M1 line (in case that is missing ... -
ZX Interface 1 Odd ProblemI have just upgraded a rubber key ZX Spectrum (issue 3) to a ZX Spectrum+. Oddly, when used with a ZX Interface 1, CAT 1 produces a question mark. T…
... 't think it was an /M1 line issue though...) -
Microdrive Serial ProtocolGentlemen, I've been dreaming for a long time to develop a Microdrive emulator, where an SD card loaded with .MDR cartridge images can be accessed t…
Opus and IF1 will fight for the ROM-paging, the M1 line I believe. Anyway M1 (or equal relevant line) is not available at the Opus expansion port. All Opus/IF1 combinations I have seen had a an added (soldered) double throw switch in either Opus or IF1. -
Microdrive Serial ProtocolGentlemen, I've been dreaming for a long time to develop a Microdrive emulator, where an SD card loaded with .MDR cartridge images can be accessed t…
... -paging, the M1 line I believe. Anyway M1 (or equal relevant line) is not ... -
+3 with dead expansion portI bought a +3 from a WoS user. So far, the computer works as expected, but when an interface (e.g. DivIDE (configured correctly) or Multiface3) is co…
... a Z80 with a faulty M1 line. Had a 128K+2 with ... -
Toasted +3Oops.. I shorted one of my +3 (being clumsy with multimeter, doh) when measuring PSU connector pins :D Any immediate guesses what exactly died on thi…
... way. If you shorted the !M1 line to -12v then you probably ... shorted +12v onto the !WAIT line you could well have damaged ...
