Extended Attribute In particular I'd be surprised if a 4th bit weren't used. But for what?
-----Original Message----- From: Martin Packer <martin_pac...@uk.ibm.com> To: IBM-MAIN@LISTSERV.UA.EDU Sent: Wed, Feb 24, 2021 2:54 am Subject: Re: Colours on screen (mainframe history question) The interesting question to me is "which colours"? I would say we started with a 3-bit colour space: R, G, B. And so the colour Red is 100 in this space and a more complex colour like Yellow is probably 110. Is this right, though? In particular I'd be surprised if a 4th bit weren't used. But for what? Cheers, Martin Martin Packer WW z/OS Performance, Capacity and Architecture, IBM Technology Sales +44-7802-245-584 email: martin_pac...@uk.ibm.com Twitter / Facebook IDs: MartinPacker Blog: https://mainframeperformancetopics.com Mainframe, Performance, Topics Podcast Series (With Marna Walle): https://anchor.fm/marna-walle Youtube channel: https://www.youtube.com/channel/UCu_65HaYgksbF6Q8SQ4oOvA From: Tony Harminc <t...@harminc.net> To: IBM-MAIN@LISTSERV.UA.EDU Date: 24/02/2021 01:00 Subject: [EXTERNAL] Re: Colours on screen (mainframe history question) Sent by: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> On Tue, 23 Feb 2021 at 19:10, Seymour J Metz <sme...@gmu.edu> wrote: > IBM had color support for DIDOCS, ISPF and XEDIT pretty early. I don't recall when GDDM picked up color support. Very early 1980s - earlier than I remember support for DIDOCS or ISPF. And almost certainly GDDM was under development in parallel with the 3279 hardware; IBM rarely comes out with hardware on a whim that has no software to support it. One must also remember that the 3279 was merely the first implementation of an architectural shift in the 3270 series. Tony H. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN Unless stated otherwise above: IBM United Kingdom Limited - Registered in England and Wales with number 741598. Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU ---------------------------------------------------------------------- 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
