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Re: VME boards
Edstrom #120272 12/30/21 05:10 PM
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Yeah, the entire INTELLEC-4 systems run cycle-accurate and cycle-interruptible. There are a bunch of other cycle-interruptible CPU cores, e.g. DSP-16, and supposedly the full MOS 6502 and H8 families, although I haven’t tested them myself.
Re: VME boards
Edstrom #120273 12/30/21 05:28 PM
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I can verify MOS 6502 and WDC 65C02. I have an Apple II card that works on the 8-bits but not the IIgs because the 65816 isn't cycle-interruptible.
Re: VME boards
Luigi30 #120274 12/30/21 09:50 PM
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Originally Posted by Luigi30
What device should I look at for a good example of reading an MFM image? I’ve been copying from one of the other Motorola controller drivers but can’t work out how the PLL stuff works.

I did some work on the pcw.cpp driver which has a MFM floppy system attached, it worked well but I don't know if it is relevant for what you are doing.

Because I can
Re: VME boards
R. Belmont #120371 01/15/22 05:42 AM
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Originally Posted by R. Belmont
You can absolutely do cycle-accurate full system emulation in MAME now, but you need to start from a cycle-by-cycle capable CPU core (one that can run only one cycle of an instruction rather than always running at least 1 instruction).

Yeah, I did set up callbacks for the 8X305 core that let me perform operations on the board at the quarter-cycle resolution that it needs. Hm, okay, I'm feeling like I can get back into this. At the very least, I can push up what I have so far (cycle-accuracy for the 8X305, more VMEbus control lines, and enough of the '320 for it to say it can't find sectors) and go from there. I started taking notes on the timing circuits and dividers as well.

Last edited by Luigi30; 01/15/22 05:43 AM.
Re: VME boards
Edstrom #121274 08/21/22 07:45 PM
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please tell me how to run the src/devices/bus/vme/vme_cp31.cpp driver on the latest release?
Re: VME boards
Edstrom #121275 08/21/22 08:03 PM
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vme_cp31 is a slot device, not a driver.

You can run it e.g. in the miniforce driver:

mame miniforce -slot1 cp31

no idea how well it works though

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