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MultifaceOne Vs Multiface128Is there any advantages to having a Multiface128 as opposed to a MultifaceOne for the 48k rubber speccy? Currently I have the M1 and sometimes get s…
Yeah but Im sure its not the M1 line thing. I just put a new Z80 in it and that fixed the other M1 issues I was having with the interface one. I was thinking its probably 'wobble' when I am hitting it. -
MultifaceOne Vs Multiface128Is there any advantages to having a Multiface128 as opposed to a MultifaceOne for the 48k rubber speccy? Currently I have the M1 and sometimes get s…
... not the M1 line thing. I just put a new Z80 in ... it and that fixed the other M1 issues ... you can rule out the M1 line problem entirely).
toasted soeccysHello, ive jsut bought a pair of speccys on ebay (one 16k issue 2 & a prob 48k issue 3) unfortunaly the genius who sold them tried to see if the wor…
... additionally - although my analogue electronics fu is not all that strong, looking at the schematics for an Issue 2 suggests that the power supply that generates some of the 'weird' voltages (+12v) is a switch mode power supply, which gets regulated by ...toasted soeccysHello, ive jsut bought a pair of speccys on ebay (one 16k issue 2 & a prob 48k issue 3) unfortunaly the genius who sold them tried to see if the wor…
... , looking for A0=high and M1=high when IORQ=low is ... /> Alternately you could use a Z80 PIO to make an interface ...Regarding the interface with USB port[url]http://www.octocom.es/reuniones/art_madridsx07_11.html[/url] [url]http://velesoft.speccy.cz/kmouse/km-doc/kempston_mouse_turbo_interface/km-t_2…
... interrupt processing from the Z80? I note that M1 isn't connected ... - the Z80 acknowledges interrupts by putting IORQ low with M1 high. I ... an interrupt acknowledge by the Z80, the I/O port decoding ...Regarding the interface with USB port[url]http://www.octocom.es/reuniones/art_madridsx07_11.html[/url] [url]http://velesoft.speccy.cz/kmouse/km-doc/kempston_mouse_turbo_interface/km-t_2…
... interrupt processing from the Z80? I note that M1 isn't connected ... - the Z80 acknowledges interrupts by putting IORQ low with M1 high. I ... an interrupt acknowledge by the Z80, the I/O port decoding ...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…
... I think it's the M1 syndrome in one of my ... . I even checked three different Z80 chips in the failing one ...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…
... - which Z80s had the faulty M1 lines, and what was the ... with LaesQ... we swapped the Z80 with one from a +2a ...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…
... high. (IORQ low and M1 low = an interrupt acknowledge, ... was formerly connected to M1 directly to the +5v ... .
The M1 problem therefore appears to be ... ).
The M1 line isn't actually needed ... out whether your Z80 has a faulty M1 line). I ...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…
... high. (IORQ low and M1 low = an interrupt acknowledge ... Speccy.
The M1 problem therefore appears to ... /> [quote=Winston;181349]The M1 line isn't actually needed ... whether your Z80 has a faulty M1 line). I ... don't!) with M1, while monitoring M1 and some other ...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 ...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…
... PCB layout for 'use M1 / don't use M1' to allow for ... to test the CPU's M1 line.
I've ... copy and share etc. My Z80 fu isn't as good ...problem with sinclair zx 48 issue 6aHi all, I have the following problem when I turn on my sinclair without rom inserted. [url]http://217.79.64.145/sinclair/5.jpg[/url] when I turn o…
... places that way: check the Z80's clock pin, and check ... bus, check for activity on M1 (M1 goes low with every instruction ...Interface 1 electrolytic capacitorsInterface 1 has three 47μF electrolytic capacitors. Is it necesary to replace them with fresh ones? I always do this with old speccys but is it…
... a Spectrum (like the Z80 with the dodgy M1 line - only a ...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) …
... has a sub standard Z80 (it's the M1 line I think ...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) …
... has a sub standard Z80 (it's the M1 line I think ... don't rely on the M1 line but monitor IORQ ... only every active simultaneously when M1 would be active so ... you can get around the M1 not working problem that ... the section titled [B]How Z80 commands the board[/B] ...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 ... oscilloscope hooked up to a Z80 ;-)
[QUOTE]Which brings ...He's back......and he's got a new trick! AY Chip here. I've been away far too long. I would like to announce 'HatStand': for no adequately explored reason, I h…
... high fidelity emulation of the Z80 - such as making the interrupt ... the ISR, and the special M1 acknowledge cycle if you have ...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…
... 0 volts is logic 0. M1 is high (+5 volts).
Z80 User Guide (just google for ... Z80 User Guide, or visit [ ... all the timings for the Z80, and explain how it ... the right port address while M1 is high, IORQ is low ...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…
... s a special M1 cycle when the Z80 acknowledges the INT ... line, where IORQ goes low and M1 ... 't pay attention to M1 then interrupt acknowledges can ... The diags board uses M1 so you can test ... the M1 line by jumpering M1 (quite a few ...Interface rom - Need help to dump itHi, I have temporarily an interface that is similar to a multiface. It has an NMI button and displays a menu where states can be saved and pokes ent…
... interface does decode the /M1 line from the Z80.
This ... address' contents as data, so /M1 is inactive when accessing it ...Interface rom - Need help to dump itHi, I have temporarily an interface that is similar to a multiface. It has an NMI button and displays a menu where states can be saved and pokes ent…
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 ... , and page out when the Z80 executes an instruction at a ... a page in, when the Z80 fetches the instruction from that ...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 ... , and page out when the Z80 executes an instruction at a ... a page in, when the Z80 fetches the instruction from that ...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?
... magnitude comparators) plus the M1 and MREQ line. M1 active + MREQ active ... and take action before the Z80 gets around to sampling the ... ) rather than 0x00 (NOP). The Z80 is TTL compatible, and TTL ...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?
... magnitude comparators) plus the M1 and MREQ line. M1 active + MREQ active ... and take action before the Z80 gets around to sampling the ... ) rather than 0x00 (NOP). The Z80 is TTL compatible, and TTL ...divIDE woesHi y'all ! Last night I built my lovely divIDE ;-) I downloaded flasher and +divide.tap from [url]http://www.biehold.nl/rudy/+divide/index.htm[/url…
Incidentally, who made the Z80 in the faulty machine? Both the machines with bad M1 lines that I've encountered had Zilog rather than NEC parts.divIDE woesHi y'all ! Last night I built my lovely divIDE ;-) I downloaded flasher and +divide.tap from [url]http://www.biehold.nl/rudy/+divide/index.htm[/url…
... root cause of the bad M1 lines are - now seen ... 226917]Incidentally, who made the Z80 in the faulty machine? ... the machines with bad M1 lines that I've encountered ... know and actually developed a Z80 mobo, what the hell ... does a faulty /M1 line do? I guess ...The direct bus or indirect one... that is the questionThe Ethernet project continues...and I'm in a quandry. So I've managed to implement enough socket library for the W5100 that socket, bind, listen, a…
... will trap the Z80 executing (i.e. MREQ active + M1 active + RD ... . /RESET goes low) and MREQ + M1 at address 0x0000. Hold through ... bus and catch it before M1 goes low.
I ...Adding new peripherals to FuseI'd like to add an execution trapper/ROM pager to Fuse so I can do ROM debugging on the PC rather than on the Spectrum. Basically, I need to trap exe…
... the leading edge of the M1 cycle for a handful of ... the trailing edge of an M1 cycle for page out.
z80.c, instead.
There ...
