Came across this card inside a 5120. Can't find much of anything online about it. Anyone know what it is?
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Macintosh Portable Card ID
- Thread starter Canby Fat Mac
- Start date
It's a RAM expansion card. Those eight parallel black components are the RAM ICs. They're in the fairly unusual ZIP (rather than DIP) packaging. I recognized that much, and a search for "Macintosh Portable"+Xilinx yielded this: https://www.reddit.com/r/VintageApple/comments/4scwil/got_4_macintosh_portables_for_100_what_is_this/
Would be cool if that xilinx chip was readable. as that is acting not only as an address decoder, but an SRAM to DRAM converter, as DRAM is muuuuch cheaper than SRAM these days. The 1Mhz crystal serves as the refresh clock.
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