-
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 ... -
Test card screenStarted off just messing about in order to test a machine. But ended up with this: [code]10 FOR a=0 TO 0 STEP 0: PAUSE 1: BORDER 1: BORDER 2: BORD…
... messing about in order to test a machine. But ended up ... -
InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…
... 0x0038:
* M1: 7 tstates: acknowledge the interrupt ... routine:
* M1: 7 tstates: acknowledge interrupt and ... cycles:
* M1: 6 tstates: acknowledge interrupt.
test was reversed in the ROM ... -
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 ... automatically because some 48k snapshots test 128k paging for additional runtime ... -
RealXThis may be a dumb question but will RealX ever get released?
... is not applied until the M1 cycle is completed. This contention ... .
We cannot obviously test RealSpec's snow effect as ... is none, but we did test the "snow contention", and you ... -
Looking for 'Your Computer' gravity simulation type inHi, In one of the old Your Computer mags, in the type in progs section near the back, there was a Speccy program which simulated interaction between…
... />
[code]
30 LET m1=20: LET v1=5: LET ... for the info, I'll test it on visual basic to ... -
Looking for 'Your Computer' gravity simulation type inHi, In one of the old Your Computer mags, in the type in progs section near the back, there was a Speccy program which simulated interaction between…
...
[code]
30 LET m1=20: LET v1=5: LET ... for the info, I'll test it on visual basic to ... /> 30 INPUT "First Body: Mass? ";m1,"Velocity? ";v1,"Angle? ";a1,"x ...
40 PRINT TAB 23;"M1=";m1: PRINT TAB 23;"v1=";v1 ... br /> 160 LET a1x=f1x/m1: LET a2x=f2x/m2: ... -
Dead Spectrum diagnosis and desolderingI have two dead Spectrums - one I'm pretty sure is caused by bad memory, and the other - well, perhaps a bad ROM, perhaps a bad CPU (it gets halfway …
... see lines like /RFSH and /M1 and the address lines are ... . I tried the 'piggy back' test as suggested by 'Servicing Sinclair ... 74LS157 (and I need to test it on breadboard to check ... -
Dead Spectrum diagnosis and desolderingI have two dead Spectrums - one I'm pretty sure is caused by bad memory, and the other - well, perhaps a bad ROM, perhaps a bad CPU (it gets halfway …
... see lines like /RFSH and /M1 and the address lines are ... . I tried the 'piggy back' test as suggested by 'Servicing Sinclair ... 74LS157 (and I need to test it on breadboard to check ... -
Nooooo my speccy died!??!!Hi! I am quite sad. :( Tonight I got a kempston interface so I rushed home to try it on my spectrum+ The edge connector of the interface was narrower…
... total repair, all pass the test in the hardware checking tape ... , RAM) inclucing the Z80's M1 line (they didn't have ... -
Blowtorch method of Speccy repairsI just did my first Spectrum repair (and successful at that). It was the Issue 2 spectrum I wrote about a while ago, I just hadn't got around to doin…
... , you should load the Sinclairs test program.
It performs tests ... 128 ) so you can test Z80's M1 line (NMI).
I ... all tests on Sinclair's test program) and when i pressed ... would just reset. If the M1 line doesn't work you ... -
It's fitting...... that in the very month that the 25th anniversary of the Speccy falls on, I'm just finishing up making my first ever Spectrum peripheral. It's a …
... [/B] or even from [B]M1[/B] lines.
There are ... , I'm still in the test stage where I have to ... -
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…
... .
My test board's address decoder uses ... the board. I used this test program:
... drilled out the M1 line on my test board, and ... .
The M1 problem therefore appears to be ... The M1 line isn't actually needed for my test board ... -
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…
... the fault.
My test board's address decoder ... the board. I used this test program:
[code]
M1 line on my test board, and connected ... The M1 line isn't actually needed for my test ... the time*, tho), another test would be to hand-clock ... -
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.
test code itself runs entirely in ... -
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…
... M1 / don't use M1' to allow for an easy way to test ... the CPU's M1 line.
Spectrum Diagnostics Board - 25th Anniversary projectWell, I said I'd try and get something online about this by today, and I have indeed done so. This web page still needs finishing off (in particular,…
... - such as the CPU clock, M1 line, address and data bus ... a ROM CRC and interrupt test.
Unfortunately, I don ...Printer InterfacesI have a customer who wants to connect an Epson 850 printer to a humble rubber key Speccy. Now I happen to have 3 printer interfaces (all Kempston) …
... />
You'll need to test I think.
I ... standard Z80 (it's the M1 line I think), there's ...Help hacking Split PersonalitiesI`ve been hacking away at Split Personalities for the purpose of putting new screens and graphics (items). The current screen is at 41187 and is 160…
... />
This is a test source to assemble once the ... ld bc,$33f
jr m1
x2 djnz x3
jr m1
x3 djnz x4
jr m1
x5 djnz x6
Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…
... T3 and T4 of each M1 cycle. Why it doesn't ... simple way of doing the test is to measure the execution ... , then you do the same test over and over, increasing the ...Input/Output on Edge ConnectorI would like to sense a pulse on the data bus via the edge connector, i.e. on or off. How do you decide what port it is on? I would also like to send…
... acknowledge.There's a special M1 cycle when the Z80 ... where IORQ goes low and M1 goes low. If you ... 't pay attention to M1 then interrupt acknowledges can ... diags board uses M1 so you can test the M1 line by ... jumpering M1 (quite a few ...Rom dumping a Mirage MicrodriverI need to dump the rom of my Mirage Microdriver for Zub and don't know what to do...any help?
... line is wired, or the M1 line is wired or both ... run a program that will test all I/O ports.
Rom dumping a Mirage MicrodriverI need to dump the rom of my Mirage Microdriver for Zub and don't know what to do...any help?
... do you should decode to test unambiguously for:
[LIST]
M1 and MREQ line. M1 active + MREQ active ...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…
... it though, I tried to test with RANDOMIZE USR 16376 ... ... timings exactly correct on the test bench waveform you're ... transition low to high. (M1 is part of the simple ... decoders, which for the M1 cycle latches the output of ... 2nd T-state of an M1 cycle), and for the ...z88dk 1.8 releasedSince I am the most regular of the z88dk peeps to post here I might as well let you all know that v1.8 has been released. [code] A little later than…
... have begun to write simple test programs that demonstrate a few ... ram, WRX16 hi-res mod, M1-NOT circuit enabled (options on ...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…
Is there a way to test the M1 line with only a multimeter ... (if any) have a bad M1 - i've got spare (new ...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…
... Is there a way to test the M1 line with only a ... case, it suggests that the M1 line is indeed knackered.
M1 line (ZXATASP & ZXMMC+) ... working under ResiDOS even if M1 is broken is that this ... etc use. Probably the M1 line is used only for ...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…
... ]Is there a way to test the M1 line with only a ... much is "high" logic on M1 (this seems to vary, and ... enter the reset state and M1 will go high, reading some ... 0,7V means a dead M1 pin.
Release ... s continously, and this causes M1 to show a 50% duty ...Problem with Discovery OpusI've just got a Discovery Opus, but it seems to be faulty. When I connect the Speccy and switch it on, it displays the "C 1982 Sinclair Research", …
... you have another Spectrum to test the interface on? If so ... as ZX Interface 1) to test on your Spectrum? If so ... out things like a faulty M1 line)
