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Re: Main CPUs as a slot device? [Re: Javier Donoso] #101270 08/24/15 12:58 PM
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Add-on cards with CPUs are already well supported in MAME. The troll was talking about the main CPU chip itself being swappable, which is far less compelling and would require junking the entire MAME codebase.

Re: Main CPUs as a slot device? [Re: Javier Donoso] #101271 08/24/15 01:10 PM
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Emulating PDS slot PowerPC upgrade cards that use a two-phase boot would be quite interesting.

Re: Main CPUs as a slot device? [Re: Javier Donoso] #101272 08/24/15 01:16 PM
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Yeah, although from what the mac68k.info guys have worked out their on-board ROMs (which aren't dumped) interact with some kind of logic in custom chips to patch the original system ROM. Not fun.

Also, standalone PPC Macs still don't work, so trying to go right for the tricky case is probably not a good idea smile

Re: Main CPUs as a slot device? [Re: R. Belmont] #101275 08/25/15 01:26 PM
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Originally Posted By R. Belmont
Add-on cards with CPUs are already well supported in MAME. The troll was talking about the main CPU chip itself being swappable, which is far less compelling and would require junking the entire MAME codebase.


I like the idea and it fits in with some of my other ideas, but as I'm out of the game for the foreseeable then nobody should expect to see anything soon. If I submit anything it will be on a fork in case it does have implications. Junking the entire codebase would be extreme, the short term impact should be way less than that & long term it should be possible to clean up some of our accumulated crud.

Last edited by smf; 08/25/15 01:33 PM.
Re: Main CPUs as a slot device? [Re: R. Belmont] #101276 08/25/15 01:29 PM
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Originally Posted By R. Belmont
Yeah, although from what the mac68k.info guys have worked out their on-board ROMs (which aren't dumped) interact with some kind of logic in custom chips to patch the original system ROM. Not fun.


Do you have a link to this? It sounds like interesting reading, but I've combed their forums and haven't found anything in particular on the 040 PDS/PPC card.

Last edited by Sharkpuncher; 08/25/15 01:30 PM.
Re: Main CPUs as a slot device? [Re: Javier Donoso] #101314 08/27/15 11:10 AM
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Jumping into this from another angle. I am developing drivers for some bus based cards and I was previously thinking using the bus as the main device since the chassi itself can be active but seldome has a CPU. I am specifically talking about some VME boards where by specification the first slot is the controlling bus master. Some chassis even allows segmenting but I think I can ignore that.

However from this thread it sounds like it would be better to make the bus master CPU board in the first slot be the root device and then figure out a way to populate the other slots with whatever VME devices there might be.

Many VME CPU boards is able to act as both master and slave so in theory a second instance of the board in the first slot could act as a slave in the second slot. Would that make sense in MAME/MESS terms?

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