On 03/15/12 1:20 PM, Jerry McAllister wrote:
> But, on the 7 track, it used a 6 bit character set that excluded
> lower case, eg was only upper case alpha, decimal digits and special
> characters. I don't remember how binary was encoded on them,
> probably pairs of 6 bit 'bytes' since the PPs were 12 bit 'machine'.
now that I think about it, the BCD I remember *was* a 6 bit code, with
just the core 64 characters. and the CDC machines I remember were
30/60 bit word sizes and the PPs were 12 bit... machines like the CDC
6600. so the 6 bit character code fed nicely into 7 track tape (6 bits
plus parity). yes, this was 1960s hardware, still in use in the
early/mid 70s, IIRC, that 6600 was largely used to support a 7600.
anyways. ancient history. i'd have said 'been there, done that, got
the t-shirt', except I wore those t-shirts out 30 years ago.
--
john r pierce N 37, W 122
santa cruz ca mid-left coast
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