This reminds me of how early 16MB 30 pin SIMMs based on 400 mil chips were very tall as well. It is a shame that by the time 16Mbit chips was catching on the Mac IIfx was obsoleted by the Quadra.
As a side note, this also reminds me of 400 mil vs 300 mil 16 megabit DRAM chips (even 350 mil 4 megabit DRAM chips often barely fits). There is a reason why Apple switched to 72 pin SIMMs by the time of the LC III.
Just looked at "MC68000 Group 1 and 2 Exception Stack Frame" and "MC68000 Bus or Address Error Exception Stack Frame" and the two are completely different, requiring a tons of code in the Lisa bus error handler.
As a side note, the proposal suggest raising the clock speed of the 68010 to 10Mhz. Given that the speed of 68010 tends to lag behind a 68000 anyway...
I don't think this is how bus errors work on the 68000. You can't directly RTE from a bus error on the 68000. Remember that every intersegment call on the Lisa triggers a bus error and I believe often used special code sequences..
The 68010 did not include an MMU and I am not talking about changing the MMU. I am talking about the new support for handling bus errors for example where you can just RTE.
0178 is the original Mac II ROM. 067C is the ROM used in the Mac IIci and later. There is also 077D (SuperMario), but A/UX never supported Macs that used this one.