Charles Mills wrote: > http://bitsavers.trailing-edge.com/pdf/ibm/360/princOps/A22-6821-0_360PrincOps.pdf > > Too wonderful for words!168 pages for the whole book...
Indeed! I keep a saved copy on my desktop and sometimes still reference it for sake of simplicity. > It's an image scan and not searchable... The copy I just downloaded from the Bit Savers link is searchable, at least using Adobe Reader X, v10.1.3 When I searched for "ASCII" I found, on page 10, as you said: "When the ASCII set, expanded to eight bits, is preferred, the codes [for + and -] are 1010 [A] and 1011 [B]. The choice between the two code sets is determined by a mode bit." And as remarkable as that document is in itself, even more remarkable - I think - is that those codes are *still* honored, as well as 1110 [E] for +. The following sequence *still* works, even 50-plus years on. The final result being +2. [...] AP NUM,=X'1A' NUM + (+1) AP NUM,=X'1B' NUM + (-1) AP NUM,=X'1C' NUM + (+1) AP NUM,=X'1D' NUM + (-1) AP NUM,=X'1E' NUM + (+1) AP NUM,=X'1F' NUM + (+1) [...] NUM DC P'0' [...] ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
