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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...

Incidentally, the SPARC architecture has a segmentation mechanism specifically to emulate the FC=2 behavior of the 68k Suns. You think other vendors' back compatibility hacks are gross, Sun made theirs mandatory in the CPU architecture. The LC's version of the HMMU is specifically for 24-bit...

For what it's worth, every PDS card I've ever looked at follows Apple's recommendation and emulates NuBus so the declaration ROM is often identical to the NuBus version (when there is one) except for the name string.

I was surprised about that too. Just to clarify the actual operation, it calls SANE for the FP calculations, and SANE will use the FPU if it's available. The things you find debugging emulation.

The standard Toolbox scrollbar control does use the FPU if it's available (and SANE if not).

The Apple II was frequently used back in the day to cross-develop for other 6502 machines like Commodore and Atari because it had better and faster mass storage options, as well as better assemblers.

It's called "Integrated Woz Machine" because it's the 6 chips from Wozniak's original controller integrated into a single chip (and with some additional features added).

HFS+ doesn't inherently require any particular CPU, but booting from an HFS+ partition does require newer boot code in the ROMs, which generally means an '040 or PPC. If the boot partition is plain HFS you can use the known hacks to make 8.0 and 8.1 run on an '030 and format other partitions as...

Does it do the "bonk" sound when you turn it on? From the picture it looks like you probably ruined the motherboard, but if it bonks then it might be fixable at least.

:ROFLMAO: I totally get it. On the IIc it would probably even be OK if you followed up with a Control-Open Apple-Reset, but I still wouldn't do it regularly.

Yeah, this is a super standard thing to do with old computers. I'd recommend against changing the switch with the IIc powered on, but should be fine otherwise.

It should - the IWM/SWIM interface to the drive is very much not flexible, and the PowerBook 140 schematics don't show anything weird in that area. Obviously nobody's ever tried it though.

IIcs I've seen have mostly been with the chunkier UniDisk 5.25 drive that went with later production IIes and the IIgs.