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WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…
... register has now bits M0,M1 and M2 with the following ... 64 colour programable palette.
M1: 0 for the standard 256x192 ... ? I hate you :P (yes, even more :P :P )
even a complete AY-3-8912 ... -
Another cause for DivIDE problems on 48K'sThe last months some topics were opened to discuss problems with 48K ZX Spectrums and DivIDE. Sofar we found: - Bad Z80's because of poor fanout (si…
... ]
Wow, that's even more simple, and can be ... fix, it must be the M1 signal of the Z80 that ... -
The Disciple clone... doable?Hi. As a spectrum user in the 80's this was the dream interface all-in-one for me. I have a 48k+ and planning on get a 128K toast-rack later. Anyway…
... you want! Or at least, even if it is, I'm ... a lot to read before even begin to understand the disciple ... Z80 control lines work (mainly /M1, /MREQ, /ROMCS, /IORQ, /RD and ... -
Spectranet updateHi all It's been a busy summer, and in any case I've wanted a little bit of a break from doing Speccy stuff to avoid it getting old (pun intended). …
... why it's buffered, but even after going through the buffer ... , it's probably because either /M1 isn't working or /CLK ... -
The Disciple clone... doable?Hi. As a spectrum user in the 80's this was the dream interface all-in-one for me. I have a 48k+ and planning on get a 128K toast-rack later. Anyway…
... (and the Z80) is named M1. Again, I imagine this a ... be very similar (or possible even identical?) to the board for ... interface are much simpler than even the +D's. In actual ... -
The Disciple clone... doable?Hi. As a spectrum user in the 80's this was the dream interface all-in-one for me. I have a 48k+ and planning on get a 128K toast-rack later. Anyway…
... affect 48K emulation (or even emulation of the 128K ... being careful to ensure M1 cycles don't occur ... 0x7ffd or rely upon M1 cycles only occurring for ... br /> [QUOTE]I find blocking M1 in this way the simplicity ... favour of peripherals taking M1 and ANDing it with ... -
The Disciple clone... doable?Hi. As a spectrum user in the 80's this was the dream interface all-in-one for me. I have a 48k+ and planning on get a 128K toast-rack later. Anyway…
... of patch or boot, even if they are already ... the situations where an M1 cycle would have been ... but if the system even survived long enough to execute ... DISCiPLE RAM at #0000 (even though it's already there ... imagine this working well. Even if we were really, ... -
The Disciple clone... doable?Hi. As a spectrum user in the 80's this was the dream interface all-in-one for me. I have a 48k+ and planning on get a 128K toast-rack later. Anyway…
... my way to acquire or even build one, but for now ... program running It frozes or even reset.[/QUOTE]
The ... />
The essential lines are M1 and A0-A15, to get ... piece things together from just M1, ROMCS and D0-D7.
Fully-addressed devices initiative (FADI)I would like to introduce an initiative for those who create new pieces of hardware containing legacy devices with well-known addresses. It says that…
... -known addresses. It says that even such devices should be fully ... or 16 addressing bits and /M1 signal should be decoded. For ... detect A0 to A7 and /M1 signals (and /IORQ, of course ... to A15, and /IORQ and /M1 signals.
I call ...Rocky Gush Floppy Drive InterfaceI have a Rocky Gush Floppy Drive Interface which I would like to post the details under the Hardware section of the website. What is correct procedur…
... to consider the Z80's 'M1 cycle active' line (for those ... 't know, the Z80's M1 cycle is the first cycle ... make compatibility an issue, probably even with the OpenSE ROM.
M1 will not be active. So ...Z80 compat listAfter the chat I had with a person on my facebook group about which Z80 chips work with the DivIDE device I found that there was no list at all to le…
... ) Z80's have a damaged /M1 output (either off-factory or ... users), some peripherals use the /M1 signal, so there is a ... ]NOT[/B] manufacturer / type number, even though that might be an ...Fast Z80Todays Spectrums are fast as hell and few software utilises this. Z80 in ReVerSE runs at 42 MHz, in Speccy2010 at 28 MHz, in Pentagon 2.666 and in N…
... cycle bus (not sure for M1 cycles, though). Either you replace ... considered as a MSX computer even when its main processor is ...Fast Z80Todays Spectrums are fast as hell and few software utilises this. Z80 in ReVerSE runs at 42 MHz, in Speccy2010 at 28 MHz, in Pentagon 2.666 and in N…
... cycle bus (not sure for M1 cycles, though). Either you replace ... considered as a MSX computer even when its main processor is ... nothing. But we can make even better machine now, for lower ...Things we all hate.Right, we couldn't agree on a video game, a TV program, or even a food we all liked. So to have one last stab at agreement, here's a thread to find o…
... up bad habits driving though, even the old. 10 to 2 ... near the start of the m1.. the signs will say 40 ...Things we all hate.Right, we couldn't agree on a video game, a TV program, or even a food we all liked. So to have one last stab at agreement, here's a thread to find o…
... up bad habits driving though, even the old. 10 to 2 ... near the start of the m1.. the signs will say 40 ...New CPU and Spectranet oddity.I have no reason to suspect this problem is due to a fault/poor design of the Spectranet, but understanding what it does at system initialisation may…
... exactly the same as the M1 signal being bad - it'll ... entropy that can be generated even on a cold boot.Please explain how a Kempston interface circuit works.Can someone help me understand how a Kempston joystick interface works, as I want to design and build my own as an experiment. I understand switches…
... . I also found out the !M1 was used to distinguish between ... appreciate that without using both !M1 and !RD together you could ... operation.
So really, even if one is skimping and ... three of !IORQ, !RD and !M1. If you don't I ...IF1bis StabilityI just thought I would start a different thread relating to the IF1bis, and leave the copyrighters to it elsewhere...:-P I've had mine for a few mon…
... ? What /M1 signal?, for that matter.
[QUOTE]- Even just plain ...hash function permutation tableI'm using a simple Pearson hash function to generate keys for a $(103,6) array using a 256-byte permutation table. How do I arrange the entries in th…
m1 to m6 can be in the range 0-9. This is purely to make the calculations in BASIC faster. I choose the most 0s and 1s in m1 to m6 to make the BASIC hash calculation even faster.PlusDlite problems with 128K modelsLast year I developed the PlusDlite, and already shipped out a couple of them. Only recently I discovered some problems with 128K models. I remember…
... and bingo!
So, even though I have a few ... that had problems were good M1 lines, I would like to ...PlusDlite problems with 128K modelsLast year I developed the PlusDlite, and already shipped out a couple of them. Only recently I discovered some problems with 128K models. I remember…
... and bingo!
So, even though I have a few ... that had problems were good M1 lines, I would like to ...Pentagon floating bus timingI wanted to take a little break from working on the ZXDS UI yesterday, so I added support for Pentagon timing instead, so I can finally enjoy the lik…
... analogue circuit. But there is even better indication. My alignment routine ... quite fine in all emulators, even if obviously most of them ... are actually looking at an even more subtle issue: when the ... properly is any clone with M1 delays (Leningrad, Scorpion). I ...Pentagon floating bus timingI wanted to take a little break from working on the ZXDS UI yesterday, so I added support for Pentagon timing instead, so I can finally enjoy the lik…
... similar way we already count M1 accesses for RZX replay. It ... between the paper and ink even somewhere in the middle of ...SCF/CCF flags - new discoveryI can't believe that no one is interested in discussing the additional, previously undocumented internal state of the Z80 CPU I have discovered recen…
... at the start of each M1 cycle, I will save the ... [/I] model of Z80 accurately, even if it's a less ...Harlequin clone...PCB manufactured!Using Chris Smith's detailed schematics and project notes from the Harlequin... a Speccy fan in the United States by the name of Don (Superfo) has de…
... the problem with the M1 signal and even a new CPU could ...Harlequin clone...PCB manufactured!Using Chris Smith's detailed schematics and project notes from the Harlequin... a Speccy fan in the United States by the name of Don (Superfo) has de…
... the problem with the M1 signal and even a new CPU could ... ]
Bingo! Not a bad m1 line but a different type ... the z80 to test the M1 line but I've used ...Harlequin clone...PCB manufactured!Using Chris Smith's detailed schematics and project notes from the Harlequin... a Speccy fan in the United States by the name of Don (Superfo) has de…
... the problem with the M1 signal and even a new CPU could ...The Disciple clone... doable?Hi. As a spectrum user in the 80's this was the dream interface all-in-one for me. I have a 48k+ and planning on get a 128K toast-rack later. Anyway…
... don't even care about /RD or /RW, just /M1. The more ...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…
Still I have the feeling M1 problems occur more often these days.
So even when it was working in the first place.
I can't find a good reason for that other than load on it.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…
... signal diodes connected between /M1 and the supply lines ... work out that the /M1 output was being damaged ... with defective /M1 outputs. And even if there was ... a source of cheaper Z80s with defective /M1 ... other interfaces use /M1 if a 74LS138 is ...
