rhohler wrote:
The NuMustang discussion got me thinking. What is the rarest Apple II card today? Of course, prototype cards are limited and rare but what production card. I would bet on the Transwarp II card or something.
I have some 128K bubble memory cards that emulate a Disk ][ with
somewhat less capacity. They were made by Helix Labs, and were
intended to provide non-volatile storage for Apple II's used in
harsh industrial environments.
I don't have easy access to serial numbers, but I'm guessing that
not too many were made and even fewer survive.
Some of you may remember that magnetic bubble memory (in which small
circular magnetic domains ("bubbles") circulate on a thin garnet
substrate under the influence of external magnetic fields) were
expected to eventually replace magnetic disks in the late 1970s!
-michael
NadaNet and AppleCrate II: parallel computing for Apple II computers!
Home page: http://home.comcast.net/~mjmahon
"The wastebasket is our most important design
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