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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…
... to the Z80
input clk, // connected to INT signal (20ms period ... iorq, // Z80 IORQ signal
input rd, // Z80 RD signal
input m1, // Z80 M1 signal (may not ... -
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…
... Interface 1 and DivIDE use M1 signal as input (among others, of ... looked at the M1 signal using a scope, the signal is permanently low ... 't SGS implement the M1 pin on their Z80's? Anyone has ... -
Known Z80 M1 problems?I got an email yesterday from someone asking for a Z80 without the M1 problem. I only know about the fanout problem that many Z80's are suffering of…
... someone asking for a Z80 without the M1 problem.
I ... the fanout problem that many Z80's are suffering off, causing ... att all.
This M1 problem is new to me ... ' a ZX Spectrum with a Z80 which has this M1 problem maybe? -
Anatomy of a bad M1No, not the motorway (although at times the tarmac M1 goes about as well as this one...) But the bad M1 problem that seems to occur most with issue …
... to the M1 line on the Z80. The Z80 is a ... (probably including any other signal that runs nearby, hence ... connecting a Spectranet, the signal gets pulled up (there's ... 's left of the M1 signal is a bit lower ... In summary, a Z80 with a bad M1 is probably caused by ... -
Replaced Z80 now a very dark screen!Today I dag out an old issue 3 that ive known for a long time has a faulty Z80 (M1 line) so I heat gunned it out, socketed it and replaced it with a …
... long time has a faulty Z80 (M1 line) so I heat gunned ... -
harvard architecture spectrum clone.I got my first +2 before christmas. I'd never given the 128k spectrums much thought, always been a 48k rubber key tradionalist. :smile: I've been me…
...
I know the z80 isn't designed like this ... in with a read and M1 signal plus other logic for some ... but not classed as a M1 cycle, (need to look ... and reads that are not M1 cycles. display file would ... issue i think with the z80 but offset a little by ... -
divIDE issuesI discovered a few issues with the divIDE hardware and FATware software that may be of interest to some people. 1. ROM paging If your Spectrum is a…
... achieved by forcing DivIDE's /M1 input to 1 (using OR ... , or 470-ohm-resistor-weaken /M1 signal tied to +5V directly etc ... ) has known issues with 128k Z80 snapshots loading. The IM2 detection ... -
Testing RAM Chips After RemovalHi I am going to use Winstons Hot Air Gun method of removing the RAM chips from a 4S circuit board. I wish to check the RAM chips, I have a Logic Pr…
... 've found out about faulty M1 lines, I'm making a ... so that the use of M1 is selectable by jumper, so ... or non-dodgyness of the M1 signal can be determined.
Z80's clock!)
The ... -
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 uncommon ... -
RFC: ZXI hardware interface standardisationReposted from c.s.s to reach a wider audience [QUOTE=Andrew Owen] You may have noticed that there are more people making add-ons for the Speccy than…
... signal at the rear bus, to the INT pin at the Z80 ... device to use the INT signal? If it's the case ... into account the M1 signal and/or the RFSH signal, so misdecondings won ... ) can be ZXI compliant? The signal is documented to be on ... -
Faulty Interface 1I bought a 'tested' Interface 1 on ebay the other day. Aside from the previous owner 'cleaning' the contacts with WD40!!! (bad, bad, bad eeurrgh :rol…
... were sold with faulty Z80 CPU ( bad M1 signal ) and as such the ... refusal.
Try a Z80 swap and see.
Spectrum 8bit IDE adaptersHello there my fellow WoS'ers Today I am pleased to (finally) release these little adapters into the wilde [URL="http://postimage.org/image/1aceto6…
... [B]Bad (weak) M1 signal (pin 27 of Z80)[/B]
[INDENT ... I intentionally made this signal track as short ... CPU with a poor M1 signal... I went onto ebay ... new Z80 CPU.
[/INDENT]
[B]Signal Strengths ... Toshiba and other branded Z80's will differ ...divide question - ribbon cable?Hi - recently got a divide and loving it but not enough room on my desk. Is anyone aware of a supplier of a ribbon cable that could sit between +3 …
... wire you also introduce signal doplar (reflection), ... interference as well as signal pickup, even at ... Z80 have weak signal strengths - especially noted is the M1 signal ... from the CPU, if this signal ...Z80 not-wroking with divIDEHi mates. I have two questions, maybe somebody could know. I realize some ZX Spectrums don't work with divIDE due to specific Z80 chips. 1) if …
... with divIDE due to specific Z80 chips.
1) if ... I change the Z80 - into another one - will my ... Spectrum with divIDE-non-compatible Z80, no version of divIDE at ... about the issue of missing M1 signal?Known Z80 M1 problems?I got an email yesterday from someone asking for a Z80 without the M1 problem. I only know about the fanout problem that many Z80's are suffering of…
... to know is if the M1 problem is the same ... not matter much: exchanging the Z80 solves both.
... So if a Z80 works with DivIDE, it's ... not suffer from a bad M1 line or bad fanout.< ... possible to solve the bad M1 signal by adding a transistor to ...Known Z80 M1 problems?I got an email yesterday from someone asking for a Z80 without the M1 problem. I only know about the fanout problem that many Z80's are suffering of…
@beverstee
Sadly as Winston points out... some Z80's don't even have enough of an M1 signal to amplify with a transistor.Z80 new old stockHi. I found this on eBay but ... is there a way we could know they don't hav a faulty M1 line? [url]http://www.ebay.com/itm/Zilog-Z80-CPU-Z0840004PS…
... [B]all[/B] Zilog Z80's are broken, fresh from ... many of them with Zilog Z80's inside (and a ... ), and whenever I used /M1 signal in a circuit, that worked ... ) surprises. They're simply Z80 clones (with an awkward naming ... surprise me if these Z80 clones were made by ...Z80 new old stockHi. I found this on eBay but ... is there a way we could know they don't hav a faulty M1 line? [url]http://www.ebay.com/itm/Zilog-Z80-CPU-Z0840004PS…
... [B]all[/B] Zilog Z80's are broken, fresh from ... many of them with Zilog Z80's inside (and a ... ), and whenever I used /M1 signal in a circuit, that worked ... ) surprises. They're simply Z80 clones (with an awkward naming ... surprise me if these Z80 clones were made by ...Z80 new old stockHi. I found this on eBay but ... is there a way we could know they don't hav a faulty M1 line? [url]http://www.ebay.com/itm/Zilog-Z80-CPU-Z0840004PS…
... thing as a "dodgy M1 line", they either work ... like M1 is internally disconnected in the Z80, and any signal ... 't even resemble a valid M1 signal).
If ... might work with a Z80 with better drive, for ... instance a CMOS Z80 or a different manufacturer' ...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…
... be the M1 signal of the Z80 that fails, or another Z80 signal problem, which ... both will result in swapping the Z80.
Fastest Z80?Hi , Could somebody explain more about the Kawasaki Z80 33 MHz to me? Is it fully backwards binary compatible with older Z80s and could it be used a…
This CPU not use M1 signal, then not work with some interfaces as DIVIDE/DIVIDE PLUS/D40/D80/INTERFACE 1/etc...
CPU timing is incompatible (faster) than original CPU Z80 and software can run faster and multicolors/samples will incorrect....Z80 compat listAfter the chat I had with a person on my facebook group about which Z80 chips work with the DivIDE device I found that there was no list at all to le…
... that some (NMOS) Z80's have a damaged /M1 output (either off ... users), some peripherals use the /M1 signal, so there is a problem ... peripheral with such a damaged Z80 chip.
And ... on their outputs compared with Z80's from other manufacturers. Which ...DivMMC EnJOY!Coming up... [IMG]http://benophetinternet.nl/hobby/vanmezelf/DivMMC_enjoy_first_render.jpg[/IMG]
... ? sometimes the problem is the M1 signal from z80, and as the divide ... /> anyway with a wrong clock signal you can always see the ...Harlequin clone...PCB manufactured!Using Chris Smith's detailed schematics and project notes from the Harlequin... a Speccy fan in the United States by the name of Don (Superfo) has de…
... sometimes the problem with the M1 signal and even a new CPU ... have a problem with that signal)
Ingo.[/QUOTE]
m1 line but a different type of Z80, I had ... tried to substitute the z80 to test the M1 line but I ...Harlequin clone...PCB manufactured!Using Chris Smith's detailed schematics and project notes from the Harlequin... a Speccy fan in the United States by the name of Don (Superfo) has de…
... sometimes the problem with the M1 signal and even a new CPU ... have a problem with that signal)
Ingo.[/QUOTE]
1) zilog z0840004psc z80 cpu 9010 oj
2 ...Issue 4S bad M1Never ever seen a 4S with a bad M1 line before today [url=http://postimg.org/image/o2yrigdb1/][img]http://s14.postimg.org/o2yrigdb1/IMG_1291.jpg[/img…
I think Macc means the Z80 itself. Some of them apparently have a weak M1 signal which causes problems with some hardware (DivIDE for example)DIVMMC my version512 ram, 8kb Flash ROM, esx dos, 2x thru, micro SD card slot,prototype board: [URL=http://www.fotosik.pl/showFullSize.php?id=18408198292851f7][IMG]h…
... ordinary square wave like digital signal! Lower trace is output from ... :1 duty cycle required by Z80.
So I added ... Spectrums probably have better clock signal and not need the extra ... found 2 units with bad /M1 signal.
So, thanks again ...New version (v0.31) of ZX DiagnosticsHi all,<br><br>Just wanted to let people know that I've released a new version of the Spectrum Diagnostics into the wild.<br><br>These were originall…
... hardware.
If the Z80 CPU is dead, the existing ... use.
If the Z80 CPU is okay, and the ... ? It doesn't use the /M1 signal, can run on a host ...What Has Happened to My Multiface 128s?These Multiface 128s have been store away for at least 20 years and when last used they were both working properly . So today I decided to try them o…
... low M1 signal or if it's missing alltogether on the Z80 would ...Microdrive faultHi, After a chat with "Winston" at the R3PLAY show I have been able to fix my 48k spectrum faulty M1 signal. My problem with the microdrive is int…
... fix my 48k spectrum faulty M1 signal.
My problem with ...
