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It's a trap!So I got a CPLD (not the eventual one I want to use for the ethernet project - rather, one I actually have here and now, an XC9536 in a PLCC44). And…
... RD transition low to high. (M1 is part of the simple ... three decoders, which for the M1 cycle latches the output of ... 5 MHz system clock (the Z80 deasserts RD+MREQ a short ... 2nd T-state of an M1 cycle), and for the ... the data bus when the Z80 was also reading the ... -
Faulty M1 LineHello, I've got a new DivIDE but it's not working with my Spectrum 48k+. I've got a sneaking suspicion that it's a faulty M1 line. Is there any way …
... 's a problem with the Z80 itself and not the PCB ... a machine with a bad M1 line, I keep meaning to ... what the nature of faulty M1 lines are, to perhaps discover ... -
Faulty M1 LineHello, I've got a new DivIDE but it's not working with my Spectrum 48k+. I've got a sneaking suspicion that it's a faulty M1 line. Is there any way …
I had a speccy with an M1 faulty line, the Multiface128 didn't work, the machine reseted each time i pressed the multiface's red button.
Changed the Z80 and that fixed the problem. -
Faulty Spectrum (help requested)I have an issue 6a specci. It's Z80 has the fault m1 line problem (Multiface 128 does not work). So I decided to put in a new Z80 but unfortunately i…
... 6a Spectrum. With the same Z80 CPU as before (when it ... a functional connection from the M1 pin of the CPU to ... -
DivIDE+ and 128K HeatsinkI got my DivIDE+ yesterday and i tried it on a 48K+ at first, it worked marvelously on it, no problems at all. Today i desided to try it on my 128 H…
... E1, WR for /E2 and M1 for E3 on that chip ... same machine also shows an M1 problem when connected to the ... is being used to sense M1 high, and the CPLD ... to sense M1 low, on this one machine ... potential reasons for this: the Z80 itself, or possibly a bad ... -
DivIDE+ and 128K HeatsinkI got my DivIDE+ yesterday and i tried it on a 48K+ at first, it worked marvelously on it, no problems at all. Today i desided to try it on my 128 H…
... , also, the MREQ and M1 transistors on the DivIDE are ... the drive of the Z80 is a bit weak ... />
Perhaps the one Z80 you have that worked has ... If you have a CMOS Z80, it would be interesting to ... drive capability required from the Z80 by orders of magnitude, ... -
Emulators on the ZX SpectrumHaving released a Spectrum 16K emulator for Spectrum 48/128 machines as part of CCG2008, I was wondering if anybody knows of any emulators which actu…
... memory translation tables - one for M1 opcode fetches, one for memory ... for memory write. Having the M1 table allows me to trap ... emulator - but that has a Z80 PIO (never used one of ... at the original TRS-80 (Z80 based not 6809)
Emulators on the ZX SpectrumHaving released a Spectrum 16K emulator for Spectrum 48/128 machines as part of CCG2008, I was wondering if anybody knows of any emulators which actu…
... memory translation tables - one for M1 opcode fetches, one for memory ... for memory write. Having the M1 table allows me to trap ... :
Anyone who wants the Z80 emulator-source can get it ...Faulty M1 pin on a Z80 made from SGS?It's the second time I have come across this: a Spectrum that seems to work ok, but if I attach an Interface 1 or a DivIDE to it, it behaves as is no…
... a dodgy M1 line is found, are the different Z80 CPUs (Zilog ...Faulty M1 pin on a Z80 made from SGS?It's the second time I have come across this: a Spectrum that seems to work ok, but if I attach an Interface 1 or a DivIDE to it, it behaves as is no…
... money, including z80s with faulty m1 lines.[/QUOTE]
This ... - bad M1 line...
I read earlier that NEC Z80 chips were ... with dead M1, and it was ...Faulty M1 pin on a Z80 made from SGS?It's the second time I have come across this: a Spectrum that seems to work ok, but if I attach an Interface 1 or a DivIDE to it, it behaves as is no…
... a way to test the M1 line with only a multimeter ... any) have a bad M1 - i've got spare (new) Z80 chips.Faulty M1 pin on a Z80 made from SGS?It's the second time I have come across this: a Spectrum that seems to work ok, but if I attach an Interface 1 or a DivIDE to it, it behaves as is no…
... much is "high" logic on M1 (this seems to vary, ... C27). The Z80 will enter the reset state and M1 will go ... 0,7V means a dead M1 pin.
Release ... halts the CPU. While the Z80 is halted, it perform NOP ... s continously, and this causes M1 to show a 50% ...RZX Player interface - Possible?If I have a Mass Storage interface and some media (CF, SD) with a couple RZX files, what would I need to play them on a real Spectrum? If the RZX fil…
... right bits are on the Z80's data lines whenever it ... to count (assuming a working M1 line) and fetching some data ...Running TZX off an IDE drive? Or streaming from a NAS?Hello. I know about the DivIDE project, and about the ZX Ethernet project, but not how far they've come or what they can do. So: 1. If I have a squ…
... 's not the Spectrum's Z80 will need to interpret the ... typically work by trapping the Z80 executing the tape loader code ... combination with the RD and M1 CPU signals). When the hardware ...Dead DivIDE?I just switched on my 48K for the first time in ages (which still works fine thankfully) but when I tried it with my DivIDE+, it repeatedly crashed. …
... I found that not all Z80 processors work with divIDE. I ... any Spectrum having a Z80 without a defective M1 line.
z80 with an older NEC z80 model, the machine ... /> If i used the first z80 (the one that wouldn't ...plus3e simple ide interface problemhi, I prepared a 8bit simple ide interface 3 days ago, but I got problems (with or without ide cable connected). 1.First of all, I have to press re…
... it might be a damaged z80. But +3 works perfect without ... />
Some Z80s have faulty M1 lines, and this can cause ... is to try replacing the Z80 - this is easy on the ...plus3e simple ide interface problemhi, I prepared a 8bit simple ide interface 3 days ago, but I got problems (with or without ide cable connected). 1.First of all, I have to press re…
... I got 3 different z80 chip with defective M1 line. I'll ... start to search for replacement z80's.
Strange that ... the symptoms of a broken m1?NEC CPU - problem?I wonder if I should substitute a NEC CPU in a grey +2. Does anyone else had problems with NEC CPUs inside ZX Spectrum. Some time ago I had a Spectr…
... ]
Possibly the faulty M1 problem that a lot of ... from. Any peripheral that needs M1 (basically, anything that has execution ... ) won't work properly if M1 isn't working properly.
Z80 with pliers from the other ...Timex 2048 can't see divIDEToday my divIDE with CF adapter arrived. I connected it to my Timex 2048, switched the computer on and nothing happened. I mean "(C) 1982 Sinclair Re…
If you still can't get it to work, it may be that the M1 line of your Z80 is faulty. At least, this was the case with my (original) divIDE. I've not got round to changing the Z80 yet, but have another machine that works fine.Program Counter question - please readSorry if this is in the wrong forum, but please read it through anyway - see on the FUSE PSP emulator I asked the author if he'd add an option to pri…
... view of the Z80, it *never* crashes. The Z80 just continues and ... program. The only time the Z80 halts is when it hits ... which is done once per M1 (instruction fetch) cycle).
Z80 Expander Bus ControllHello there my fellow forum chummies, I would like to ask a few technical questions, Now I come from an Amiga Hardware based background, and as yo…
... />
A knowledge of the Z80 will help (doesn't have ... Spectrum specific, but knowing what M1 is for example would be ...Opus DiscoveryI've got an opus dicovery 1 with 2 x 3 1/2" drives. I used it many times on my 48k but it doesn't work with my 128k toastrack. It also had some sort …
... ? Maybe the Z80 on your computer has a faulty M1 signal (not ...Spectrum dead: 8 vertical bars in alternating colorsI have been soldering on this basterd for a long time now. All IC's now have sockets (except the LM1889). I swapped all 4116's by types that are 100%…
... do that. Even then the Z80 *could* still be fine. There ... soldered in, check MREQ and M1 is toggling). Then check for ...+3 dead(!)Hi, When I turn on my +3 I see only white and black strips (vertical) on screen any idea on how to fix it? Thank you in advance Chris [IMG]http:…
... />
What's MREQ and M1 doing on the Z80?+3 dead(!)Hi, When I turn on my +3 I see only white and black strips (vertical) on screen any idea on how to fix it? Thank you in advance Chris [IMG]http:…
So the Z80 works. The ROM presumely works ... HALT instruction continues to issue M1 cycles to allow DRAM ... "instruction" read at that M1 cycle is just a NOP ... check the INT signal at Z80. Is it pulsing? It should ... wire and connect NMI (at Z80 too) to ground for ...+3 dead(!)Hi, When I turn on my +3 I see only white and black strips (vertical) on screen any idea on how to fix it? Thank you in advance Chris [IMG]http:…
... the CPU (its the 2nd Z80,as the 1st was dead ... ... its a Z80-4IRL , works ok on my ... these:
pin 27 (/M1) = low pulse
pin 26 ...Plus D and Grey Plus 2Hi, I have two grey Plus 2, both fully working (one of them was "new" when I got it from a technical center stock). I put my Plus D clone on both. …
Wonder if it might be the Z80 has a faulty M1 line? That is the main cause of issues with some peripheralsSome ever noticed that +2A/+3 halts Z80 using WAIT?I mean: Anyone ever noticed that the +2A/+3 halts the Z80 using WAIT? All documentation I've read about contention state that the ULA halts the Z80 …
... is that, after all, the Z80 offers a moment in which ... : the T4 cycle of the M1 machine cycle. I mean: when ... instruction has at least one M1 cycle (not sure if there ...memory chips spectrum +Hi with regards to memory chips the ones in there are tms4116 in the lower memory.there is some on ebay MCM4116BP20 can i mix these with tms ones or …
... , but the fastest Z80 memory read is the M1 cycle instruction fetch ...Converting games from tap to dskHi to all from Greece, Being an old Speccy user and now owner of most models of Spectrum (48k , 48k+ , 128K, +2 grey and +3) , I desided to salvage m…
... it (have been working with z80 and sna files since 1998 ... have a basic loader for M1 files for 48k stuborn games ...
