Odd "endianness" [was Re: RE: Base 64 posts to the list]
lars at nocrew.org
Thu Dec 8 04:20:05 CST 2016
Rich Alderson wrote:
> From: Chuck Guzis
> Sent: Monday, December 05, 2016 6:15 PM
>> I've seen PDP-10 9-track tapes done two ways--one character per frame
>> and then 4 frames (36 bits) with 5 7-bit characters and the sign bit
>> left over.
> Neither of those is entirely accurate. 9-track tapes on the PDP-10
I know nothing about physical magtapes. I have seen this comment about
the MIT ITS machines:
> DM had the only 9-track tape drive; the other machines had 7-track
> tapes, as befit 36-bit machines.
So I suppose many ITS tapes would have stored six frames per word.
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