[Default] On 30 Apr 2019 09:57:23 -0700, in bit.listserv.ibm-main 0000000433f07816-dmarc-requ...@listserv.ua.edu (Paul Gilmartin) wrote:
>On Tue, 30 Apr 2019 08:30:34 -0500, Elardus Engelbrecht wrote: >> >>... 3279 and similar IBM 3270 display terminals? Those heavy toys have 3 blue >>switches, one for Normal/Test, one for 4 or 2 colours and lastly one which >>switch from A,a to A or vice versa. >> >I never had one of those, but a clone. In the monocase position it would >display majscule while transmitting minucule. Inexcusable! If this was >modal behavior of IBM 327x terminals it was probably one cause of the >enduring bigotry against mixed case among mainframers. A more important reason was that addition of mixed case in either ISO/ASCII changed a compare from a simple Compare Logical Character into a subroutine. While this was always true if a true dictionary or phone book sort is wanted, this would make it true for virtually all compares. Should A = a? If not should the sequence be A,a,B,b ....? Clark Morris a> >>From https://en.wikipedia.org/wiki/IBM_3270 I see this note: >>"3270 character set" [ This set contains both lower and upper case letters ] >"On the 3275 and 3277 terminals without the a text feature, lower case >characters display as uppercase." > >Character generator ROMs were costly, and unavailable on interpreting >keypunches. > >-- gil > >---------------------------------------------------------------------- >For IBM-MAIN subscribe / signoff / archive access instructions, >send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
