[TUHS] PDP-11 questions
John Cowan
cowan at mercury.ccil.org
Tue Jan 26 02:00:47 AEST 2016
Johnny Billquist scripsit:
> the desktop models are called MS800A, MS800B, MS880A and MS880B.
Good to know.
> Reading through it, it's very clear that this is not OS/8, or any
> derivative of it.
You're right. What it did share, however, was the OS/8 file system,
except that the date epoch was 1972 instead of 1970. I don't know if
COS survived long enough to use extended dates.
> the transfer program
> available to transfer files to/from OS/8.
That didn't actually transfer files, which wasn't necessary; IIRC,
it converted between the COS-310 format for text files (about which
I know nothing) and the OS/8 format (three 8-bit bytes in two 12-bit words,
packed with the first two bytes in the low order bits of the words,
and the third byte split between the four high order bits).
> The EDUsystems were in fact having numbers
> like 10, 20, 25, 30, 40 and 50. No 310 or anything close...
That's what I remember. My first PDP-8 was running EDU30 on top of
OS/8.
> But EDUsystems do not really predate the 8/A. They carried on in the
> PDP-11 systems as well, beyond the 8/A era.
Sure. What I mean is that the EDUsystems began before the 8/A, not that
they ended before it.
--
John Cowan http://www.ccil.org/~cowan cowan at ccil.org
Why are well-meaning Westerners so concerned that the opening of a
Colonel Sanders in Beijing means the end of Chinese culture? [...]
We have had Chinese restaurants in America for over a century,
and it hasn't made us Chinese. On the contrary, we obliged the Chinese
to invent chop suey. --Marshall Sahlins
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