On Tue, 20 Nov 2018 20:13:35 +0000, Seymour J Metz wrote: >The ASCII bit in the PSW affected only the decimal instructions, including >UNPK. > Doesn't UNPK just swap nybbles of the rightmost byte and set all other zone bits to 0 regardless of character set?
>It did not affect how the card reader read zoned numeric data. > I doubt that any IBM card reader had any awareness of zoned numeric -- bytes wuz bytes. I understand the most primitive ASCII-EBCDIC mapping was derived from Hollerith punch cards in the specification of ASCII. Was there ever a (non-IBM, surely) card reader that conveted Hollerith to ASCII? -- gil ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
