On 07/08/14 21:45, Hal Wigoda wrote: >> On Jul 8, 2014, at 4:36 PM, Always Learning <centos at 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