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Spectrum 2-3 times more powerfull than MSX?![url]http://www.youtube.com/watch?v=2-kI0urN9tI#t=8m18s[/url]
... inserts 1 waitstate into every Z80's M1 cycle (instruction fetch), regardless ... shortest memory read cycle for Z80, a half clock cycle shorter ... is not part of the Z80's memory map, but fully ... -
Spectrum 2-3 times more powerfull than MSX?![url]http://www.youtube.com/watch?v=2-kI0urN9tI#t=8m18s[/url]
... inserts 1 waitstate into every Z80's M1 cycle (instruction fetch), regardless ... shortest memory read cycle for Z80, a half clock cycle shorter ... is not part of the Z80's memory map, but fully ... -
Sinclair Interface 1 bugs.It's probably been mentioned before, but my Sinclair Interface 1 will reset certain Spectrums in my collection - those with serial numbers starting '…
... with Z80s with a faulty M1 line which caused the Interface ... to Sinclair to have the Z80 replaced if it effected you ... -
Broken speccys on ebayI often see broken speccys on ebay,the usual listings of no display on pic etc,i know could be opening a can of worms when buying one,so can [B]some[…
... special mem test
- Z80 faults - NMI, M1 - external interface/logic analyzer ... -
Two Odd Spectrum 128K FaultsI also have 2 Spectrum+128 machines with heatsinks. 1. Did not power up properly - I replaced the 7805 regulator and cleaned the edge connector and …
... the lack of the M1 line on the Z80 or does anyone ... -
damaged spectrum+ (blinking squares)Hi, Sorry for my poor english, but I couldn't find on family forums any remedy for my hardware problem with my first speccy in my life :) I've bought…
... last night - while removing the Z80 from a 128K toastrack (which ... my fault, had a dead M1 line) I noticed that the ... solder as possible from the Z80's pins.
2. Bend ... -
Problem with new DivIDE+ on ZX +2A?I just received DivIDE+ from RWAPSoftware and am having trouble getting it to work on my +2/A. The device came with 1GBCF card preinstalled with 3 ga…
Sounds like your system has a Z80 with a duff M1 line. If thats the case just replace the Z80 with a new one.
But try the Divide+ on anther spectrum first just to be on the safe side. -
Problem with new DivIDE+ on ZX +2A?I just received DivIDE+ from RWAPSoftware and am having trouble getting it to work on my +2/A. The device came with 1GBCF card preinstalled with 3 ga…
Is there a way to tell if I have one of the bad z80 without the M1 line, does the CPU look differently, has special marking, serial number, etc.?
Is there any software test to test for it?
Thank you. -
Problem with new DivIDE+ on ZX +2A?I just received DivIDE+ from RWAPSoftware and am having trouble getting it to work on my +2/A. The device came with 1GBCF card preinstalled with 3 ga…
... one of the bad z80 without the M1 line, does the CPU ... tell from look if the M1 Line is faulty or not ... with a serial number (which Z80 did not have). -
DivIDE with gray +2 LOAD not workingI have 128+2 gray. It has faulty upper memory. PEEK 23733 shows 191. I wanted to use divIDE to load some test programs, but it always hangs when exec…
... .
It is NEC Z80 CPU, original Zilog did not ... somebody could design divIDE without M1 line :-) -
DivIDE with gray +2 LOAD not workingI have 128+2 gray. It has faulty upper memory. PEEK 23733 shows 191. I wanted to use divIDE to load some test programs, but it always hangs when exec…
... rather tricky, M1 is used to tell when the Z80 is fetching ... be read and see that M1 is active to know it ... memory read.
Bad M1 lines cause problems with pretty ... -
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…
[QUOTE=RetroTechie;454158]IIRC the Z80 will 'remember' internally that #IORQ ...
Not according to the Z80 User Manual, it doesn't ... until it sees the special M1 cycle that acknowledges an interrupt ... apparently being "remembered" on a Z80 based system - it's ... -
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…
... the INT pin at the Z80. A external device can block ... will take into account the M1 signal and/or the RFSH ... -
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…
... , if you have a faulty M1 line, the DivIDE Plus will ... it just depended on which Z80 processor the guys building the ... -
The Sadness of my Decaying Speccies.I've been avidly collecting ZX Spectrums since the late 90's and whilst at the time of the late 90's and early millennium my Spectrums and associated…
... mode supply too (and the Z80 quite often, given that at ... the edge connector, M1 is right next to +12v ... -
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…
... that so many Z80 CPUs proved to have defective M1 line in ... made (cut-rate ones mabe?), M1 line doesn't just fail ... -
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…
... .
Regarding CPUs, NEC Z80 were used in a lot ... , and had no problems with M1, so it is something specific ... -
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…
... amazed when a Z80 with missing or weak M1 ever was produced ... 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…
... amazed when a Z80 with missing or weak M1 ever was produced ... 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? -
Multiface 1 cant load tapesIve just acquired a Multiface 1 for my 48k, seems to work alright, brings up the menu etc but when i go to load a tape,(and this is in the off or on …
... ).
The M1 line on the Z80 appears to be fine ... -
Microdrive problem?I recently aquired a micro-drive, Interface 1 and some brand new cartridges + the original manual, so i thought i'd rig it all up and see what it …
... issue could be a faulty Z80 Chip on your Spectrum (I ... presume the IF1 needs the M1 line). -
Spectrum +3 doesn't workMy recently ebay purchased +3 arrived today, so I was quite excited to have one again. I plugged it in and all was well, except for a slightly worry…
... bet is its a bad M1 line on both our machines ... buggered if im desoldering that Z80 out to test it! ill ... -
Spectrum +3 doesn't workMy recently ebay purchased +3 arrived today, so I was quite excited to have one again. I plugged it in and all was well, except for a slightly worry…
... bet is its a bad M1 line on both our machines ... buggered if im desoldering that Z80 out to test it! ill ... +3 may have a socketed Z80? I'll take a look ... -
Spectrum +3 doesn't workMy recently ebay purchased +3 arrived today, so I was quite excited to have one again. I plugged it in and all was well, except for a slightly worry…
... , thanks guesser. Would changing the Z80 and/or the ROMs allow ... you have a Z80 with a bad M1 line it's just ... -
Spectrum +3 doesn't workMy recently ebay purchased +3 arrived today, so I was quite excited to have one again. I plugged it in and all was well, except for a slightly worry…
... ]if you have a Z80 with a bad M1 line it's ... the M1 is dodgy? Also, if I got a replacement Z80, how ... -
Spectrum +3 doesn't workMy recently ebay purchased +3 arrived today, so I was quite excited to have one again. I plugged it in and all was well, except for a slightly worry…
... the M1 is dodgy? Also, if I got a replacement Z80, how ... no way of testing the M1 line easily that I know ... -
Spectrum +3 doesn't workMy recently ebay purchased +3 arrived today, so I was quite excited to have one again. I plugged it in and all was well, except for a slightly worry…
... the M1 is dodgy? Also, if I got a replacement Z80, how ... -
divide deviceHi, This is first my first post,so hello to you all I first Spectrum 48k was a Xmas present way back in 1983,best gift ever. Then I moved on to a C…
... dirty edge connector or faulty M1 on Z80 CPU.
Unfortunately it ... -
Spectrum +3 doesn't workMy recently ebay purchased +3 arrived today, so I was quite excited to have one again. I plugged it in and all was well, except for a slightly worry…
Playing SID music on AY??Hello. Some time ago, with occasion of another thread, I was asking about possibility of making a very certain thing - a SID emulator for Spectrum …
... really works with some, on Z80 with 3.58 MHz and ... additional WAIT state per M1 cycle in whole RAM (slower ...
