AT&T 3B1 / 7300 / UNIX PC: Boot sequence from floppy
ard at p850ug1.demon.co.uk
Mon Dec 6 14:25:29 CST 2010
> I'd also really like to know why the DMA controller has two separate
> direction control bits -- DMAR/W- and IDMAR/W-... this seems downright
> silly, though in keeping with the rest of the TechRef. My "annotated
> edition" corrects about a dozen minor and major errors in the register
> set descriptions, and adds a bunch of informational sticky-notes and
> scribbly comments to reinforce certain points. Ewwww...
I know nothing about this machine, but I seem to rememebr that the
scheamtics on bitsavers contain things that appear to be the schematics
of the DMA and video ASICs in terms of TTL parts. If I am right, that may
be a start in understanding what they actually do.
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