-
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? -
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 ... -
DivIDE HelpHi all, After a rather long wait my DivIDE from Papaya labs arrived. I connected it to my spectrum, turned it on and...nothing. The green power LED…
It'll probably be the Z80 in you speccy. I've ... and scratched) has a broken Z80 M1 line :-( so the divIDE (or ... -
Help and Advice with DivIDE PlusHi Guys, Really struggling to get any reliable actiivty with my DivIDE Plus and am looking for some pointers. I am trying to get it to work with on…
I believe you have faulty Z80 M1 line, probably on both your ... i solved by replacing the Z80 cpu with another brand (the ... it was always a faulty M1 line Z80 cpu, i replaced them ... -
Help and Advice with DivIDE PlusHi Guys, Really struggling to get any reliable actiivty with my DivIDE Plus and am looking for some pointers. I am trying to get it to work with on…
... fix was to replace the Z80 CPU (most likely due ... ). See my comment about Faultly M1's below.
... I believe you have faulty Z80 M1 line, probably on both your ... was able to replace my Z80 CPU and now it ... stock of 4 spare modern Z80 chips which I could ... -
Why doesn't my loop work?Can anyone help me understand why my loop doesn't work? Is it to do with how DEC HL affects the flags? [code] ; Read 32k bytes from port 191 as fa…
[QUOTE=Dr BEEP;499310]See [URL]http://www.z80.info/z80time.txt[/URL][/QUOTE]
That list has quite a few errors, for example there exist no -
48K's and bad DivIDE compatibilityI have had some 48K boards and complete machines in the past which didn't work fully with a DivIDE interface. The reason for that always was a Z80 pr…
... times. This can't be Z80 M1 line.
If you are ... -
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…
... adjacent, I've killed a Z80 M1 line just like that (ironically ... 12V to M1. The Z80 continued to work minus the M1, and the ... me wonder: were the faulty M1 lines caused by some faulty ... factory that shorted 12V to M1 before the machine shipped? -
Pentagon RAM memoryDoes anybody know or have reference to technical docs, how no contention on RAM access is achieved in Pentagon 128K clone ? Looking at schematics it …
... />
Given the Z80 has a rather leisurely 280ns ... ) - and furthermore, the Z80 only samples the bus right ... synchronized due to the Z80's irregular pattern of ... memory reads during a Z80 M1 cycle, one read can ... the Z80 can occur any time during the M1 cycle, ... -
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…
...
input rd, // Z80 RD signal
input m1, // Z80 M1 signal (may not ... (iorq),
.rd(rd),
.m1(m1),
.up(up),
.down ... iorq),
.rd(rd),
.m1(m1),
.up(up),
.down ... -
MISSING M1 LINE ON +48????I was posting questions about my DIVMMC enjoy not working on one of my +48`s and have now got round to testing if its cpu related.Trouble is the one …
... , a brand new CMOS Z80 CPU works in most Spectrums ... br /> Also note that the /M1 line and the NMI lines ... device may use the Z80 /M1 output to detect when ...
For some Z80 p0rn and some sexy Z80 info [URL="http ... .cpu-world.com/CPUs/Z80/MANUF-Zilog.html"]click ... -
Seen any ebay madness?? post it here !!!What with some high prices fetched on speccy games over the past few days , thought it might be an idea to keep a WOS record of some of the higher fi…
... the one with a dodgy z80/m1.. so how is that my ... -
7mhz CPU?One of the things I like about Spectaculator, is that I can zap the clock speed of the emulated CPU up. Doing so makes me wonder about why the desig…
... generate the screen display. The Z80 memory access is rather slow ... would probably have been the Z80 M1 cycle which is the shortest ... the time, but the NMOS Z80 is always pretty cool). -
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 ... I have looked at the M1 signal using a scope, the ... 't SGS implement the M1 pin on their Z80's? Anyone has ... -
Of course, when the M1 line of the Z80 CPU is failing, the Z80 CPU must be replaced![quote]Of course, when the M1 line of the Z80 CPU is failing, the Z80 CPU must be replaced![/quote] Err, why? If you are trying to use an interfa…
... course, when the M1 line of the Z80 CPU is failing, the ... Z80 CPU must be replaced ... that needs a Z80 MPU with a working /M1 line, yes of ... to, let alone using the /M1 line. So it’s irrelevant ... -
Techy Z80 questions****** Question 1 ****** Take the instruction SET b, (HL). This is broken down (in machine cycles) as follows (according to Microprocessor Technolo…
... ISBN 0835943925):
M1: OpCodeFetch(4T) [i.e. the ... as follows:
M1: OCF(4T) [i.e. the ... I've seen in many Z80 docs. My question: ... when does the Z80 read the opcode that would ... it ?? And if the Z80 could access the memory while ... -
A question about M1 cyclesI'm writing an interrupt routine that, after the usual register pushes, will jump to a location of my choice with a [b]JP (IY)[/b] instruction. If I…
... -check my understanding of M1 cycles inside the Z80.
Is ... -
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 …
... />
But the bad M1 problem that seems to occur ... to the M1 line on the Z80. The Z80 is a ... moves in time with where M1 should actually move, but ... ://photo.alioth.net/Scope/M1-with-spectranet.png[/img]< ... In summary, a Z80 with a bad M1 is probably caused 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…
... M1 line?
[url]http://www.ebay.com/itm/Zilog-Z80 ... -
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…
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 NMI button, the Spectrum resets.
Is a bad Z80 CPU?
My soldering skills are so bad. :( -
Faulty M1 or no?Hi all, OK, so I've got an issue 4B which was pretty much untouched and appears to work fine (starts up OK, loads games, 23732 and 23733 both retu…
... ! a dodgy M1 line", so I removed the Z80, fitted a socket ... and inserted another (known working) Z80, still the same. I also ... put the Z80 from the 4B into another ... -
z80 replacementI have a Z80 with a bad M1. Would this be a suitable replacement? http://www.mouser.com/ProductDetail/ZiLOG/Z84C0006PEG/?qs=%2fha2pyFadujVcI6Qdio…
I have a Z80 with a bad M1. Would this be a suitable replacement?
http://www.mouser.com/ProductDetail/ZiLOG/Z84C0006PEG/?qs=%2fha2pyFadujVcI6QdiokaAkI9fpd2Kz8T0thgCH2nHo%3d -
Replacing z80Hi all, I've just finished removing my z80 and installing it back in in a socket. Surprisingly I haven't broken anything in the process and the sp…
... 've just finished removing my z80 and installing it back in ... suggestions point to a duff M1 line.
My question ... place to get a working z80 from? I can get an ... -
Z80/SNA Compiler under Windows???Does anybody know anything about Z80/SNA compiler under Windows???
Does anybody know anything about Z80/SNA compiler under Windows??? -
Z80 to DSK?Does anyone know if there is a prog that can convert z80,tzx or tap files to dsk format? I have access to a friends pc that has a 3 inch drive which …
... a prog that can convert z80,tzx or tap files to ... looked at a program called z80 snapshot loader at
[url ... -
Z80/SNA compiler under Windows???Does anybody know anything about Z80/SNA compiler under Windows???
Does anybody know anything about Z80/SNA compiler under Windows??? -
Visible-Z80 - VISZ80 - by Miklos Patrubany Hi All ! Visible-Z80 - VISZ80 - by Miklos Patrubany Does anyone have this program ? Please help me. I want to learn Z80 and Assambler on Z8…
Hi All !
Visible-Z80 - VISZ80 - by Miklos Patrubany
< ... want to learn Z80 and Assambler on Z80 and I have a ... -
Converting TAP to Z80Is there an EXE out there that will convert *.TAP into any other snapshot (preverably Z80 or SNA) Please Help Oatesy
Is there an EXE out there that will convert *.TAP into any other snapshot (preverably Z80 or SNA)
Please Help
Oatesy -
SNA 2 Z80Hi Is there a difference between an sna file and a z80 file.Is it possible to rename the sna extension to z80 or do I need a conversion utility.
Hi
Is there a difference between an sna file and a z80 file.Is it possible to rename the sna extension to z80 or do I need a conversion utility. -
Z80 Stealth Emulator probsI have problems with my soundcard. I have an ESS1868 sound card and on most DOS programs I can use Adlib compatibility to get sound. Sometimes Soundb…
... to the problem:
Z80 stealth looks for Ess688 (or ... enable SBP support and boot Z80 stealth, but no go. Says ... . run it and then run z80 stealth. no luck. It still ...
