The only valid planes for multi-plane characters are 001, 010 and 100; the only color attributes for SFE and SA are 3-bit.
-- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 ________________________________________ From: IBM Mainframe Discussion List [IBM-MAIN@LISTSERV.UA.EDU] on behalf of Edward Finnell [0000000248cce9f3-dmarc-requ...@listserv.ua.edu] Sent: Wednesday, February 24, 2021 5:30 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: Colours on screen (mainframe history question) 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://secure-web.cisco.com/1I6OPsUVTCFCLgNe1XqmaN_H2QL5ut909RvAFKY5N-wOzyItWT2eRC0Wgi3r8l_AerOytwrxq1JKa8IJjWhmTNkaAuQ8fCeOAEJ0Sl9t34VTr9MAmHMUMRVDFr_lul3goVLfHttaoV_mNam7_7eDeYw4NTpiG_IHLIR_4-JzfoNrD6aJazQuNm27j1DnGxe8nuF7kDtZDQhKvTbez1v7qjCs3e70_aHkdmCmK4OdHpllh1Q8cySH61rqwwP3lBwa5TkLoMuvjiyf780IvJ1P1tp4uHJQpFqt0H0B9K7JXTA810nTee5HOkIsuU6U8J-NK3iLRecL9Jo8NZS26pM8vGy8USuNpRnnJK1-NLIPKyUT0hSXqX_rzxeD7SXZ34Q6xQaNiO9qduYIg6IaLz-ZHJWqKZ45QmauVxVdvOrz2JpB9x-xSz8XFpSj5CV4Scxki/https%3A%2F%2Fmainframeperformancetopics.com Mainframe, Performance, Topics Podcast Series (With Marna Walle): https://secure-web.cisco.com/19jnDAyTFo_m5zMXsY-r8tFZmCyHR3V4Qpzs_VpOjtb27SMpSQFdQiuZNSkjtEoa32I3v1KbDGoL7zaDe2G7x8hkYm-nM1MSaRLsM7jLOkXyzhSzZ9IdRHmtfWOEp-pgQseDYufnjcLfCfkbh1hJFYiLVmf1-q5zQAP1f9Rcf3qz2o0khsE_PqmFNi22LZz4FTKB16c35nRA5QoowRTcBdSprBJXSCP2sPUEIq5i9m3PcnmbUDXR95M0lIhX936IPwezJi5wbA6LS9qEyCSF1Xi_xKi2RZOhyF1sDdrUiSAGo8TENgTOM29reeDbN8wUrn4TgQNOPffjsznkyIguZYRpO3Qhpf-jmj8GnhFn6Sfl4-fzTIp0ewnDoomqZyRE3NdB_d_eJlC3cJcjqsgobLhBtsuOFIC8N1NqwWdGT3SqmyUdZ1bEfP2z5OpJ6a8kIGktj38biHaYlvzC3PN4-vg/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 ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
