[rescue] Sun 3/60

[Dan Moisa]

Oh also I've successfully swapped in GALs for some of the PALs, more
accessible and easier to program

On Sun, Nov 12, 2023, 11:06 Dan Moisa <dmoisa at gmail.com> wrote:

> The mmu is entirely in PAL chips and some common ram. Nothing weird, just
> specific part numbers that folks report are important to keep the same
> original speed rating for. A bunch of timing dependent flows
>
> I have all the part numbers, quantities and datasheets in a Google
> spreadsheet, I'll link when I'm at home.
>
> On Sun, Nov 12, 2023, 11:00 Romain Dolbeau <romain at dolbeau.org> wrote:
>
>> Le dim. 12 nov. 2023 à 19:41, Dan Moisa <dmoisa at gmail.com> a écrit :
>> > Will try to throw onto GitHub esp now with more ppl. Hopefully there's
>> something usable in there
>>
>> Thanks, that would certainly be useful to others!
>>
>> I haven't looked in detail at the schematic, do you remember any
>> 'weird' custom chips?
>> Along the 68020/68881 the 3/60 uses a "Sun-style" MMU [1], but I've no
>> idea whether that's implemented in a full-custom chip, in some gate
>> array design, or if it's a bunch of discrete components.
>> That's one of the issues when people restore old Macs of a similar
>> vintage - there's a handful of custom chips that aren't easy to
>> replace.
>>
>> Cordially,
>>
>> Romain
>>
>> [1] the architecture manual for sun3 has some details:
>> <
>> http://bitsavers.trailing-edge.com/pdf/sun/sun3/Sun-3_Architecture_Manual_Ver_2.0_May85.pdf
>> >
>>
>> --
>> Romain Dolbeau
>>
>
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