Fwd: questions about Sanyo MBC 55x collectors
chrism3667 at yahoo.com
Mon Oct 10 14:25:37 CDT 2005
> The Sanyo ran at 3.58MHz (8088)
> so that they could use
> CHEAP color burst crsytals for the oscillator.
Almost all the pc's used a crystal that was some
multiple of color burst frequency. Did the Sanyo
actually use a 3.58mhz crystal? The PC had a crystal
that was 4x that, and divided it by 3 to get 4.77mhz.
> Sanyos also used part of
> the main memory for the video memory instead of
> having video memory at a
> fixed address ala the IBM PC so a LOT of the MS DOS
> software would not run
> on it.
The PCjr's video memory was physically located low in
ram, yet appeared to be in the b-block (through the
use of a "video gate array"). Is this what the Sanyo
did? Otherwise I don't understand what is meant by
"used part of main memory".
All in all it sounds like a groovy machine ;). I'd
love to get my hands on one. And I already have 2
6300's, and 1 Xerox something, which were clones of
one another (both made by Olivetti).
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