That depends on the model and the mode. In the basic mode, the color was determined by one of four combination of attributes, e.g., intense and input. In EDS mode (2B and 3B only) there was also a color type for field and character attributes, with a choice of attributes. Multiplane symbols added another layer of complexity.
-- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 ________________________________________ From: IBM Mainframe Discussion List [IBM-MAIN@LISTSERV.UA.EDU] on behalf of Martin Packer [martin_pac...@uk.ibm.com] Sent: Wednesday, February 24, 2021 3:54 AM To: IBM-MAIN@LISTSERV.UA.EDU 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://secure-web.cisco.com/1K-uYK1eipWFSg-6F8XNC9m_2CAm1sZo_cFkRZQ8b9SP3yxiRIXY1kGG-X1UjpIoPU18B1vjwzGpiIXMzT7fHB62cQsbDWT-XUuy6Ctn6JTRFDlMYd47fyazRCHFtqSvV24HBIPst9cpirjDKUQQ9yy4dXbT0kWr7PD50k1lN-kZdxSCOkzW9mNM6MuofKZ8leHTtmqqBkwdTP9XLy97mRBJo8GveAJBlEm9uCU6eqdobf2vesil8x23USjmYoQMGM9UxB_b0ks-1FibtiBFz7TFRS3xmr0r6TfLD_zSyral9nZbd6cO60bgRX99BSfCITrEXk6UpWpNt8z5NO2rq9OaQA0ZKBb7rLf-bny0lV8I6V3GHVYWAycaf2g4g7BcKMy_qVndFmTMy4UFV1aQjkcyuSjaPK_msPFnQnopu77dISOgqBU2_qR7FfV56vMY5/https%3A%2F%2Fmainframeperformancetopics.com Mainframe, Performance, Topics Podcast Series (With Marna Walle): https://secure-web.cisco.com/1pCNnU8kfL9doKBHIlVIZMuyHaCv0OdoTo35dxF9qR4b51FQPhhzpM1zczVJHBhp2IEbjrgShmpk32YIkXVS8yhgZTSjiEytCDoRLE7OrZkjiK7m1drXYdPIFyk5k-TWPCLoygXxp7mtytW1k5RZM4uZGYbUdZ_VjdL7J1VdLTnwiSR45imJX-MSuheP9OKWb264dPFx18AAhts-sbZdmVTPBl3B9VP7L5KNxtdthCvg7CVlnEac8IVABRzD3L4NbP8SQGL-APN8ApBNuhbICrPCXf518hbV2p8fU_Bub_odwpVSdSYZUWetgUxo58T3eoZvzmsR46cLs95Oey25WLgtKFLAU3jiGmujiziFQCWgGiFDfy6pNucIKG5iD4lPXoDyRvH6RoaPL_NNSLqnbPHgdA_3SF9XZSLAXN1XinmjP86ApXgoYiyGeYsUoXbSZA9GGaT7cPGckl7Ueqq6Wzw/https%3A%2F%2Fanchor.fm%2Fmarna-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
