On 07/08/14 21:45, Hal Wigoda wrote:
On Jul 8, 2014, at 4:36 PM, Always Learning centos@u62.u22.net wrote:
On Tue, 2014-07-08 at 17:10 -0400, Robert Moskowitz wrote:
The read up on Grace Hopper and how she 'discovered' an unknown opcode when a mispunch she glued in with nail polish. They used hand punchers a lot on her programming team.
Not entirely unknown because the opcode must have been known to the technicians or computer designers but not actually documented for the programmers.
40 used to be NOP (no op) on Honeywells H-200 series.
And IBM assembler
(Sent from iPhone, so please accept my apologies in advance for any spelling or grammatical errors.)
Anyone want to borrow my IBM assembly text from college? I will say, though, that if I could have gotten the republication rights, I'd have put all manufacturers of sleeping pills out of business....
mark