Recent content by Arbee

Correct, the DeclData's a separate EPROM. A SlotsMem dump should show how the data is properly laid out as you said.

The PRAM value must be set and the SCSI pins must be bridged (actually I think just straight connected to Vcc/GND in the right pattern). Not ideal for diagnosing a machine that can't boot, and it's not clear how that would've worked at the factory either.

Here. It's 2 16-bit wide chips, so it's likely the data is interleaved to make the 32 bits for NuBus.

Correct, the ROMs are 1MiB in size (2x 512KiB).

I have a real full ROM dump of the KanjiTalk NuBus ROM card. I haven't yet committed it to MAME because I have no idea how the ROMs are organized or what software would recognize and use the card. (KanjiTalk versions of System 6 and 7 don't behave any differently when the card is or isn't...

It wants bit 17 of the D0 return value from GetHardwareInfo clear. D0 is documented to be the low 32 bits of the "hardware present" bits from the universal table, and bit 17 in the SuperMario source is "SCC IOP present". The intermediate routine at $40847D0E that it calls if the BEQ isn't...

CheckLoopBack in USTStartUp.a is where it does the check for going into diagnostic mode. ; Check for factory loopback on VIA Sound Volume lines. On Mac,MacPP,NuMac the ; jumper shorts SV2 to SV1. On newer Macs, the jumper simply grounds ; the SV1 line (bit 0, VBufA), except on Normandy...

Might as well. :) The 343S1078 file is the software-side ERS with register descriptions and the 199207 is the hardware/production oriented document with timing diagrams and long listings in binary for 3 test PROMs to validate the chip. These are under the original name BIOS which was of course...

$F1ACAD13 (2.3F2) and $F1A6F343 (2.3F1). The difference is mostly to support when the Centris brand was scrapped and the 610/650 became Quadras.

Pin 156 is listed in the ERS as TEST, non-inverted, so maybe it needs to be connected to Vcc instead of grounded? Although the ERS also indicates that's a test pin for the IOSB itself and it remaps a bunch of the other pins so maybe that would be dangerous in a production system. Edit: Test...

We don't have much version history for the ROMs/Toolbox and its a little hard to track down actual timeframes since the System file will replace the ROM code in most cases. The first machine I noticed it in was the Quadra 700/900 (1991) but that doesn't mean it wasn't in earlier ROMs. At a...

Pretty unlikely. It hasn't gotten a ton of development work. I don't know if QEMU is doing JIT or not for SPARC, which would be the main thing determining how efficient it is. The Amiga realistically lived and died in the form of the original A1000 and A500. All of the "must see" Amiga...

If you just assume it's there and hack it into the MMU tables it won't extend the boot time.

Yeah, I would not want to do any serious programming on that rubber keyboard! I don't know of any commercial kits for cross-dev. From the interviews I've seen and heard, they used serial cables to transfer and test the results.

I helped get MAME's SS1 driver to boot and install Solaris so I have much more familiarity with the thing than I otherwise would have. (My university got all their free stuff from DEC, so my hand-on experience was with the MIPS-based DECstations and some of the early Alphas). Yes! In theory...