Apple Network Server MacOS based ROMs found

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Tinkerer
Oct 25, 2021
324
167
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Pin33.jpg


Pin 33 definitely appears to be tied to something in @mizerable 's photo. Must be power plane.
 
T

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Tinkerer
Oct 25, 2021
324
167
43
mizerable said:
These may help? To me, looks like it's to the power plane, on the chips it's "v88"
Click to expand...

Well, pin 33 on all four chips is definitely tied to a thicker trace and via as is typically used for ground or power plane connections. Visual doesn't tell us which one it is tied to, but given that the 29F800 on 7100 DIMM works, it must be tied to Power.

I wonder why? The ROM chips have a Byte# pin? The ROM chips use 33 as a another power pin? Apple left the option to put programmable chips on those modules?
 
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