15 Oct
2001
15 Oct
'01
2:14 p.m.
At 01:02 PM 10/15/01 -0700, you wrote:
I have a little info if it's the D17B (1962)
(from "Proceedings of the minuteman computer users group" Tulane Univ
1973)
Number system: Fractional binary fixed point 2's complemant
Makes absolute sense in order to maximize the throuput.
Logic levels: 0V = false, -10V = true
Data word length: 11 or 24 (double precision)
Execution times: add ~78 uSec, multiply ~546 uSec, Double prec multiply
~1015 uSec
It probably used 24 bit accumulation... I'm impressed. However,
that's way too slow to implement any modern scheme (several orders
of magnitude too slow).
It probably used a mixture of analog/digital control; analog
for the single-variable, high bandwidth servoing; digital for
the higher hierarchy control.
Carlos.
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Carlos E. Murillo-Sanchez carlos_murillo(a)nospammers.ieee.org