[rescue] 3b1/7300/unixpc/s4 history [was: Wanted - 3B2]
jay_york at verizon.net
Wed Jul 9 10:37:18 CDT 2008
Lovely to see so much interest in nearly 25 y.o. technology.
Some random thoughts:
I bought my PC7300 in 1988 from Digital Data Systems in Marietta, GA.
It had been advertised in a Uni-Ops Technical Books Unix & C
"magazine", which accidentally came across my desk after the original
subscriber had been fired.
I think the O.S. was a SVR2 derivative, with some nice additions, like
shared libraries. I think it was badged CTIX. I actually had
occasion to do a next gen CTIX driver gig for Unisys around that time,
for a Convergent 386-based box (NOT A PC). By that point, CTIX was
SVR3 based. Poking through the header files, and kernel disassemblies
revealed the similarities.
I still have this machine, although it's not been powered in years.
Some time ago, the soldered in battery got replaced with a coin
holder. I think I have the voice board that went with it. It got a
ST-251/1 40MB upgrade early on. I have tubes of DRAM still waiting to
be soldered in - who has the time? Never had StarLAN, always wanted
to build an ISA bridge to get some networking onto the box.
I seem to recall that the video chip was *very* simple - I'm almost
thinking straight-on bit-mapped. The MMU was custom, and effectively
just a single SRAM.
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