Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!watmath!clyde!burl!ulysses!mhuxr!mhuxt!houxm!ihnp4!inuxc!pur-ee!ecn-pc!sandersr From: sandersr@ecn-pc.UUCP (Robert C Sanders) Newsgroups: net.periphs,net.micro,net.wanted Subject: Re: update on **real** 19200 CRT Message-ID: <605@ecn-pc.UUCP> Date: Fri, 1-Aug-86 00:48:11 EDT Article-I.D.: ecn-pc.605 Posted: Fri Aug 1 00:48:11 1986 Date-Received: Sat, 2-Aug-86 08:58:59 EDT References: <671@mordred.purdue.UUCP> <71@winfree.UUCP> <2349@cbosgd.UUCP> <1828@homxb.UUCP> <678@mtune.UUCP> <1832@homxb.UUCP> Reply-To: sandersr@ecn-pc.UUCP (Robert C Sanders) Organization: Electrical Engineering Department , Purdue University Lines: 34 Xref: watmath net.periphs:1161 net.micro:15246 net.wanted:9317 In article <1832@homxb.UUCP> gemini@homxb.UUCP (Rick Richardson) writes: >>> In article <1828@homxb.UUCP> gemini@homxb.UUCP (Rick Richardson) writes: >>>19.2 Kbs ought to be easily achievable in a standalone situation as >>>the original poster suggested, even on a stock IBM PC running at 4.77Mhz. >>>The key is to use a truly dual ported video card, so you won't have to >>>wait for retrace. At 1920 cps coming in from the 8250 you have >>>about 500 usec to handle each interrupt. That's about 125 >>>"average" instructions on a stock PC, or 250 on a fast clone. >> >>Anyone know what the IBM PC does? > [ much - much deleted ] All this talk about 19200 bu problems. (tisk, tisk) I *KNOW* for a fact that IBM PC at 4.77 MHz using a standard CGA can emulate a full VT102 at 19200 baud. I am doing it right now!! I have measured the line, and sure enough, it is throughputting at 19200. I use Mark Of The Unicorn's PC/InterComm program on the PC end, and a direct port to a DH unit on a VAX. It will and does run 19200 baud. The screen does not flicker, and you should even see Kermit zip along. Anyway, EMACS, VI and even RN run perfectly fine; I have never had any of the problems. The termcap that I use is the "dt80", with the SO and SE characters changed to show bright (the PC goes blue when it gets a \E[4h ); the termcap includes *NO* pad characters. Note the the "dt80" termcap is identical to the "vt100-np" termcap without the initialization sequence for setting the tab stops. - bob -- Continuing Engineering Education Telecommunications Purdue University ...!ihnp4!pur-ee!pc-ecn!sandersr Let's make like a BSD process, and go FORK-OFF !! -- bob (and "make" a few children while we're at it ...)