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It could be doing both. I question why it's actually running some of those lines to FPU pads. That may have just been a case of something making the design easier by preferring to connect to the system bus via FPU pads instead of trying to reach over to the bus/connector area.  This is what I...

The FPU pins in question seem to be CS and RW on the bottom side, A1 and A4 on the left, and top seems to be SENSE, D0, and D3. I suspect there's more hidden through vias. It seems that the GAL may be handling the decode/select function for the 68882 coprocessor interface, as blatantly evidenced...

What happens if you boot up normal 7.0.1 on it? The string may actually be in the System file, not the ROM. I think there's a table in there of machine models to gestalt ID. I could see a 7.0.1 beta having... different results.

More likely to me is that there's two ECL headers/pinouts because they bought monitors en masse from multiple OEMs. By putting two headers on the board, you could just plug the output board into the right one to compensate for whichever of the two ECL monitor pinouts were shipped with that...

I'm surprised, I'd figure you of all people would be enticed by pulse-length encoded analog video on optical discs. Plus LD allows the operator a surprising degree of control over the actual transport mechanism.

The HD20 uses the Rodime drive because it was actually designed to use the "Nisha" drive, which was a follow-on to the Lisa Widget drive that was cancelled in mid-early 1985 when Apple decided to stop designing their own drives. However, the HD20 was already designed around the Nisha drive, so...

I need to get a copy of IV for... reasons. There's some non-Ethernet features in my card that I have not revealed yet and probably won't until things move further along. Right now, I haven't worked out the timeline or anything, but I've got the basic concepts covered- at this point it's a pile...

Inside Macintosh Volume VI is my friend. I found an electronic copy on an old Apple developer CD from 1990. VI is important because the specifications network drivers conform to start on page 32

Did I not already make the implication that I'm working on it? ;)

The more important question is if your SE is a SuperDrive/FDHD model. If it's not, you will need an old Mac to make the disks. There is no getting around this, as 800k disks cannot be written on a PC in a format an 800k SE can read. Edit: oh wait, saw it was an SE/30. Yes, you can make those...

Even if they do, I would not use OS X with a USB floppy. Here's why: it never supported low level formatting disks. You may say "sure, I can erase a disk in Disk Utility!", but it just writes over the file system structures. It will not write new IDAMs, etc. like a full format operation does...

I did some digging in DCaDftMF 3rd edition. According to page 65, interrupts are handled by each slot having its own /NMRQ line (which is used to assert an interrupt) with the ability for the system to decode which /NMRQ line was triggered. There is an italicized notice saying that shared /NMRQ...

It does, if the card has a DeclROM based driver. Not all do. I intend to include mine in DeclROM for this exact reason. The reason you'd want a new one is that a) Ethernet drivers are NOT complicated (literally 1000-1500 LOC *max* for a simple one like a CS8900A), and b ) new driver development...

Have you even looked at the relevant documentation? You don't need to emulate another card if you just shove the driver in DeclROM.

You're very close- most used the National Semiconductor DP8390 Ethernet chip. The NE2000 is essentially Novell's build of the DP8390 reference design from the datasheet.  Why not just write new ones? Have you ever looked at an Ethernet driver? I have. The Ungermann-Bass card for my IBM RT is...

5380? Seriously? Ugh. That chip was crap in 1990, and Apple kept hocking it for several years after the fact.

100 is probably not worth it. I suspect that no 68k Mac can even saturate 10mbps. My A1200 with a 3Com 589 (Probably the best 10M PCMCIA card ever) can only do about 2 Mbps max with a 40MHz 030. I sincerely doubt that even an 840AV could saturate 10. The limitation was definitely in the...

Basing it on an existing card is a terrible idea. Many of the chips used on those cards are no longer available, nor do they even make sense to use today with the introduction of more integrated Ethernet controllers, e.g. Cirrus CS8900A.

Do not EVER test PSU voltages without a load connected. Period. They will not be accurate unless a load is connected. And yes, this often manifests as the voltage appearing too low with no load connected. The regulator circuit just does not work right without a load connected.

Yep, and the FM0 encoding combined with the lack of separate clock means you need some kind of clock recovery circuit like the SCC had, as you noted. FM0 is also far less common than NRZ or NRZI, so yeah, that's another problem. On top of that, there's the fact that each bit in FM0 may require...