<div dir="auto">Oh also I've successfully swapped in GALs for some of the PALs, more accessible and easier to program </div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, Nov 12, 2023, 11:06 Dan Moisa <<a href="mailto:dmoisa@gmail.com">dmoisa@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="auto">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 <div dir="auto"><br></div><div dir="auto">I have all the part numbers, quantities and datasheets in a Google spreadsheet, I'll link when I'm at home.</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, Nov 12, 2023, 11:00 Romain Dolbeau <<a href="mailto:romain@dolbeau.org" target="_blank" rel="noreferrer">romain@dolbeau.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Le dim. 12 nov. 2023 à 19:41, Dan Moisa <<a href="mailto:dmoisa@gmail.com" rel="noreferrer noreferrer" target="_blank">dmoisa@gmail.com</a>> a écrit :<br>
> Will try to throw onto GitHub esp now with more ppl. Hopefully there's something usable in there<br>
<br>
Thanks, that would certainly be useful to others!<br>
<br>
I haven't looked in detail at the schematic, do you remember any<br>
'weird' custom chips?<br>
Along the 68020/68881 the 3/60 uses a "Sun-style" MMU [1], but I've no<br>
idea whether that's implemented in a full-custom chip, in some gate<br>
array design, or if it's a bunch of discrete components.<br>
That's one of the issues when people restore old Macs of a similar<br>
vintage - there's a handful of custom chips that aren't easy to<br>
replace.<br>
<br>
Cordially,<br>
<br>
Romain<br>
<br>
[1] the architecture manual for sun3 has some details:<br>
<<a href="http://bitsavers.trailing-edge.com/pdf/sun/sun3/Sun-3_Architecture_Manual_Ver_2.0_May85.pdf" rel="noreferrer noreferrer noreferrer" target="_blank">http://bitsavers.trailing-edge.com/pdf/sun/sun3/Sun-3_Architecture_Manual_Ver_2.0_May85.pdf</a>><br>
<br>
-- <br>
Romain Dolbeau<br>
</blockquote></div>
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