Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.1 6/24/83; site fortune.UUCP Path: utzoo!watmath!clyde!floyd!harpo!ihnp4!fortune!norskog From: norskog@fortune.UUCP (Lance Norskog) Newsgroups: net.unix-wizards Subject: Screen Updating Message-ID: <2395@fortune.UUCP> Date: Tue, 31-Jan-84 13:48:24 EST Article-I.D.: fortune.2395 Posted: Tue Jan 31 13:48:24 1984 Date-Received: Tue, 7-Feb-84 06:00:13 EST References: <2315@fortune.UUCP>, <1588@rlgvax.UUCP>, <2373@fortune.UUCP> Organization: Fortune Systems, Redwood City, CA Lines: 16 Folks, I blew it. The Fortune screen does not update at 45kbaud, it updates at 45k chars/sec, or 450kbaud. This is from a test which just writes a 2000-char buffer of ascii text. The screen hardware is a simple character generator, with 8 bits of attribute space for each 8 bits of character. Our architecture allows the screen driver to reside in fast (expensive) RAM or slow (cheaper) ROM, with a 3/2 performance hit. We put it in ROM. When we had it in RAM, it ran at 75k chars/sec. Obviously, a tty driver page mode is not a luxury in this situation. Lance C. Norskog Fortune Systems, 101 Twin Dolphin Drive, Redwood City, CA {cbosgd,hpda,harpo,sri-unix,amd70,decvax!ihnp4,allegra}!fortune!norskog