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Re: PC/XT/AT (inside) WIP topic [Re: Kale] #115315
05/16/19 07:00 PM
05/16/19 07:00 PM
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rfka01 Offline
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Another guy commented that the NEAT implementation of 86Box (m_at_neat.c) allows the above ROM to boot to the DOS prompt.


NCR DMV- DEC Rainbow- Siemens PCD- ITT 3030-Oly People- Acorn A5000- Olivetti M20
Re: PC/XT/AT (inside) WIP topic [Re: Kale] #115316
05/16/19 07:21 PM
05/16/19 07:21 PM
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R. Belmont Online content
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Right, our NEAT just needs to have configurable version returns.

Re: PC/XT/AT (inside) WIP topic [Re: Kale] #115334
05/23/19 03:23 AM
05/23/19 03:23 AM
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AJR Online content
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My quick emulation project of the day was the ASC-88, a simple 8-bit ISA SCSI adapter. The main thing preventing it from working now is that it doesn't have a valid settings EEPROM. Since the EEPROM (a NMC9306) is mapped into the host memory space, it could theoretically even be dumped in place from a PC. There's also supposed to be a program called ASC_MODE.EXE that can update the ASC-88 EEPROM in place, but so far nobody has found a copy.

Re: PC/XT/AT (inside) WIP topic [Re: Kale] #115335
05/23/19 04:00 AM
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What settings does it actually contain? The 5380 is only a small step above riding the SCSI bus directly with some latches, so it'd probably mostly just be which SCSI ID to boot.

Re: PC/XT/AT (inside) WIP topic [Re: Kale] #115338
05/23/19 03:47 PM
05/23/19 03:47 PM
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Most of the settings aren't that obvious, because the NCR5380's simplicity means that the adapter has to work the poor host CPU a good bit harder. Some of the settings registers have only one or two functional bits; others are expected to contain one of several seemingly arbitrarily chosen values. There's one which gets individually read out from EEPROM into RAM but is completely ignored by the BIOS after that.

The ASC-88 User's Manual would probably give a meaningful overview of the card's capabilities, but that hasn't been found either.

Re: PC/XT/AT (inside) WIP topic [Re: Kale] #115405
06/08/19 10:38 PM
06/08/19 10:38 PM
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mahlemiut Offline
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Been fiddling with the PCI PC driver for a bit, seeing if I can make something resembling a PCI video card.
So far, I have framebuffer access working on an S3 ViRGE/DX, so you can see Tux whenever you boot some Linux distros.
[Linked Image]
No idea why it says "Processorprocessor", this seems to be a recent regression.


- Barry Rodewald
Re: PC/XT/AT (inside) WIP topic [Re: Kale] #115406
06/09/19 12:13 AM
06/09/19 12:13 AM
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Very cool smile

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