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Recapping your SpeccyHas anyone ever done it? I have several vintage amps, tuners, cassette decks that have been recapped. So just wondering are there many on WOS who ha…
... a Z80 with missing or weak M1 ever was produced, and even ... I have seen) a missing M1. This stock could originate from ... -
Recapping your SpeccyHas anyone ever done it? I have several vintage amps, tuners, cassette decks that have been recapped. So just wondering are there many on WOS who ha…
... a Z80 with missing or weak M1 ever was produced, and even ... I have seen) a missing M1. This stock could originate from ... who knows....
Maybe the M1 line wasn't in the ... tamperded with having a faulty M1 line? -
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…
... .[/INDENT]
[B]Bad (weak) M1 signal (pin 27 of Z80 ... 's may have a bad (weak) M1 line - this is quite rare ... 1 CPU with a poor M1 signal... I went onto ebay ... a CPU with a bad/weak M1 line wont work with a ... -
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) -
zx spectrum +2 cpu questionanother +2 mystery ... so just testing a +2 Z70700 issue 1.. although my power set up was a bit delboy .. PS2 power brick with modified end for the …
I know if the Z80 has a weak M1 line it can cause issues with these add-on devices. -
M1 LOADING between TZXs ?Splat! (Alternative) from TZX Vault is a M1 LOADING snapshot file. Is this a mistake, or is there some reason for this ? Best wishes, Cristi
Splat! (Alternative) from TZX Vault is a M1 LOADING snapshot file.
Is this a mistake, or is there some reason for this ?
Best wishes,
Cristi -
Faulty M1 linesI'm sure this has been discussed before, but using the forum search for the word 'M1' pulled back no hits, which surprised the hell out of me. Anywa…
... forum search for the word 'M1' pulled back no hits, ... which Z80s had the faulty M1 lines, and what was the ... stick my scope on the M1 line this weekend, but ... looking for timing issues with M1 (for the '138 to ... decode the OUT port address, M1 must be high, WR ... -
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 …
... that it's a faulty M1 line. Is there any way ... -
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 ... , didn't SGS implement the M1 pin on their Z80's ... -
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…
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…
... for a Z80 without the M1 problem.
I only ... att all.
This M1 problem is new to me ... 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 …
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But the bad M1 problem that seems to occur ... and low) by the M1 output could be measured relative ... ://photo.alioth.net/Scope/M1-dc-coupled.png[/img ... in time with where M1 should actually move, but ... ://photo.alioth.net/Scope/M1-with-spectranet.png[/img]< ...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…
Never 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][/url]
But it is!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 little about the faulty m1 line and i think i ...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…
... I thought, "aha! a dodgy M1 line", so I removed the ...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…
[quote]Of course, when the M1 line of the Z80 CPU ... Z80 MPU with a working /M1 line, yes of course.
M1 line. So it’s irrelevant ...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…
... ). Presumably, also, the MREQ and M1 transistors on the DivIDE are ... the Z80 is a bit weak when outputting logic 1, 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…
... the symptoms of a broken m1?[/QUOTE]
... from normal I/O) also M1 goes high (say 5V). ... ), then the
M1 signal shows no activity.
experiment without using M1 in the address decoding.
weak ULA's.
- ...+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:…
... these:
pin 27 (/M1) = low pulse
pin 26 ... the logic probe is very weak! (not bright like the other ...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 …
... Z80 have weak signal strengths - especially noted is the M1 signal from ...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…
... . This can't be Z80 M1 line.
If you are ... may be with distorted signals (weak, delayed) due to poor PCB ...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…
... under the impression that the M1 line from some batches of ... Z80 CPU were simply too weak a signal?
I ...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…
If there is a weak signal from the M1 pin, it should be ...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…
... in 1988 - 1989 which had weak or zero response on some ... classic being the non-connected !M1 issue that marred the Zilog ...Which type of Z80 cpu to use with ZX 48?Which type of Z80 cpu can I use with ZX 48? Only the 4 MHz cpu's or some with more MHz? Did not know if a 6 MHz cpu runs in a ZX 48 with 4 MHz. Mic…
... issues like a Bad /!M1 signal or weak signals over all. I ...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…
... check the expansion bus - yup, M1 and NMI both connect correctly ... the ZTX313 I used is weak too, as it came from ...Soccer SupremoHi :) Did a quick check through the MIA list the other day and noticed straight away a title (Soccer Supremo) I knew I definitely had and secondly k…
... well? I only have a m1 back-up so would this ...The Great Mystification: A reflection upon the feebleness of the "distribution denied" policyThis argument has been debated several other times in this place, yet I have not expressed my thoughts about it, and I would like to hear comments by…
Multiface One vs. Multiface 128?Hello all! Does anyone happen to know how the Multiface One and Multiface 128 differs from each other? I'm using a 48k Speccy and bought a M1 which …
... 48k Speccy and bought a M1 which then turned out to ...
