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I assume you've checked the .Sony driver source in the SuperMario tree to see if that mode was used? I'd suspect any weirdness in the chip was for Twiggy drives, except that no machine with Twiggy drives used the IWM as far as I'm aware. (Lisa 1 had the 6 chips from the Disk II controller card...

Correct, millions is always in color. Probably because 24-bit pure grayscale is really just 256 shades.

For reference, there are 2 modes in the DeclROM: 1024x768 and 1280x960. No idea yet how it determines which one.

Fry's was legendary back on the pre-1994 Internet, and it lived up to the hype when I actually got to go to one in early 2003 (the San Diego Mission Valley location). MicroCenter is the closest thing to it that exists now, but they don't carry loose chips or anything like that. I'm a little...

Were you able to get the DeclROM from it, either directly or via software? Might be interesting to SlotsParse it and see what the listed resolution(s) are.

You're right, /ENBL1 and /ENBL2 do work, unless you're mixing drive types in which case external help is necessary.

In fairness to Woz, the VIA bit stuff is because the Disk II didn't need a head select, and there was something wrong with the drive select on the IWM that never got fixed. Drive select on the Disk II did work, and on SWIM1 the built-in IWM's drive select does work. Bonus Apple weirdness...

The original 3Com/Apple Ethernet NuBus board design and its many, many 3rd party clones are in fact a Mac "port" of the NE2000. Same chips, driver software works the same way, just the bus interface is different.

The developer note for the original LC mentions that netbooting has some support in the ROM and may be supported later. If I'm remembering correctly the Apple IIe Card supports netbooting the IIe, which was likely their major use case. (The Apple II Workstation Card and the Apple IIgs both...

Yes, MEMCjr has an integrated DAFB (video) chip.

Anyway, with this accelerator and the FDHD/IIx ROMs, you should be able to use any memory configuration that works for a IIx, IIcx, or SE/30.

GCR is always done in software (although the 13/16 sector Disk II upgrade did involve a new state machine PROM for the controller). But whereas IWM is essentially just a real-time shift register showing the most recent 8 bits to spin by the read/write head, SWIM does some extra processing...

The ROM code should detect IWM vs SWIM on any machine that would've had a SWIM. It definitely works in emulation. SWIM has a complete IWM inside for GCR (400K/800K) disks. Software can switch which of the two chips inside the chip is active and detect if the switching worked (which it of...

For games on the Mac II series, NuBus itself is always going to be the bottleneck. A IIsi with a PDS card would probably have the fastest video, but I don't know if that's been benched.

The SuperMac Spectrum PDQ has acceleration in 256 color. The Thunder IV GX I think has acceleration down to 16 color, but it's been a minute since I've fought with the blitter registers on it. (EDIT: not quite. It's accelerated in 8, 16, and 32 bpp, not 1, 2, or 4). That said, action games...

If you move the 31.3344 MHz crystal to 32 MHz everything should still work, except I'd be very wary of floppy I/O under those circumstances. It will probably work (particularly if you use only disks that were formatted with the faster crystal), but writing in particular could potentially fall...

Is the slot set to Your Card in the IIgs?

I'm not aware of any NuBus cards that supported multiple monitors, even for mirroring. Multiple monitors on one card was rare for PCI and AGP, it was only a standard feature on PCI Express. Even multiple PCI cards each driving one monitor wasn't well supported on PCs prior to Windows 2000...

All of the machines that support the LC Card have a dedicated 560x384 video mode for the 12" RGB monitor. I believe you can run it windowboxed on a 13" 640x480, but I'm not clear on that detail.

Might be a weak power supply or something, because architecturally the Q950 can absolutely drive 4 monitors (3 NuBus cards and the internal display). I just tried it emulated in MAME with 3 RasterOps cards plus the internal display and it booted.