Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!seismo!rutgers!mit-eddie!uw-beaver!ubc-vision!alberta!auvax!rwa From: rwa@auvax.UUCP (Ross Alexander) Newsgroups: comp.sources.d,comp.emacs,comp.terminals Subject: Re: 9600 baud problems (was Re: when using termcap, get it right!) Message-ID: <191@auvax.UUCP> Date: Mon, 15-Jun-87 21:02:17 EDT Article-I.D.: auvax.191 Posted: Mon Jun 15 21:02:17 1987 Date-Received: Sun, 21-Jun-87 06:11:07 EDT References: <1149@carthage.swatsun.UUCP> <8601@tekecs.TEK.COM> <6828@mimsy.UUCP> <6090@eddie.MIT.EDU> Organization: Athabasca U., Alberta, Canada Lines: 29 Keywords: termcap, curses Summary: h19's considered harmful :-) Xref: mnetor comp.sources.d:850 comp.emacs:1158 comp.terminals:312 In article <6090@eddie.MIT.EDU>, nathan@eddie.MIT.EDU (Nathan Glasser) writes: > I had decided that the problem might be that the h19 couldn't really > handle 9600 baud (as described above for the gigi), since it would > explain most of the behavior I experienced, but it seemed a little too > far fetched. Since I thought h19's are/were fairly widely used, and > regarded along with others like vt100's as a standard terminal type, I > would expect it not to have such problems. > > Does anybody know whether this is indeed true of h19's? yes, it is indeed true. the h19 firmware is, to put it tersely, sh*t. OK, that's a little strong - apologies to JGL (or whoever; I don't have my source listings handy :-). But the truth is that the ROM's are clunky, to say the least. They treat the z80 as though it was an 8080, for a start. there are two fixes. one is hardware; it is relatively simple to speed up the clock on the z80 to 3 MHz and thereby pick up some speed. i never had any trouble with this on my h19 (part of my h89, actually). the other is to chuck the stock ROM's and replace them with something a little closer to good code. i borrowed a ROM from someone once that sped things up quite a bit and also did pretty fair vt100 emulation (sans 132 column, of course) but i can't remember the vendors name. i will dig around a bit at home and see what i can come up with. btw, heath/zenith will sell you a listing of the ROM. it is well commented and very complete (i know 'cause i typed it in and assembled it, and then hacked it up for my own use). ...!ihnp4!alberta!auvax!rwa Ross Alexander, Athabasca University