Xerox Alto on eBay
jnc at mercury.lcs.mit.edu
Thu Apr 14 12:48:56 CDT 2016
> From: Josh Dersch
> we copy disk images to/from the PDP-11/44 over 3Mbit Ethernet to the
> Alto :).
Ah, got it. In the context of the thread, with all the RK05 discussion, I
wrongly assumed that somehow there was an RK05 involved.
> wrote a rough implementation of PUP BSP and the Alto CopyDisk protocol
> on top of all of that. It was fun!
I can imagine! You must be the first person in about 30 years to do a PUP
> From: Jerry Weiss
> Not only that, but we used Diablo Drives on RK05 Controllers.
That doesn't surprise me one bit - the RK11-C was designed to drive Diablo
drives, and the controller/drive interface was kept almost identical in the
RK11-D (the only difference being the drive select stuff).
But the drive (either RK05 or Diablo) only provides a bit stream and sector
pulses over that interface, so turning that bit string into a sector is
controller-specific, and it would have been somewhat astonishing if the
PDP-11 and Alto interfaces had used a compatible low-level format. And, as
Josh indicated, in fact, they did not.
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