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74-pin Lisa card

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blusnowkitty:
I seem to remember someone on here was wondering why some revisions of the Lisa motherboard have extra, unpopulated pins on the backs of the expansion slots that are all bridged to a voltage and ground. Has the answer been staring us in the face all along? Check the Lisa Colour Card prototype on DigiBarn: Notice anything?

http://www.digibarn.com/collections/systems/apple-lisa1/lisa1-prototype/index.html

rayarachelian:

--- Quote from: blusnowkitty on October 15, 2020, 04:03:18 pm ---I seem to remember someone on here was wondering why some revisions of the Lisa motherboard have extra, unpopulated pins on the backs of the expansion slots that are all bridged to a voltage and ground. Has the answer been staring us in the face all along? Check the Lisa Colour Card prototype on DigiBarn: Notice anything?

http://www.digibarn.com/collections/systems/apple-lisa1/lisa1-prototype/index.html

--- End quote ---

Yup and also I suspected that this might be related to the GLM (Great Little Machine) which has slots that look like the Lisa's only more of them and has multiple CPUs each with it's own memory and for some reason 2x serial ports.

Al Kossow:
CHM has the machine shown in the Digibarn pictures!

https://www.computerhistory.org/collections/catalog/X2435.2002A

compu_85:
Did CHM get any software with it? It would be awesome to try powering it up (Safely!!).

-J

Al Kossow:
RPRS  == Rich Page and Ralph Sahm

No software came with the donation, I've dumped the firmware  I need to put them with the GLM
pictues on bitsavers.  mac/prototypes/1984_RPRS

This is probably the machine they did before BigMac

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