Path: utzoo!mnetor!uunet!mcvax!ukc!pyrltd!ali From: ali@pyrltd.UUCP (Ali Shirnia) Newsgroups: comp.unix.wizards Subject: Re: PE 3220 (v7) loses chars at input>1200bps - help! Message-ID: <1024@pyrltd.UUCP> Date: 8 Mar 88 14:05:56 GMT References: <1988Mar2.122153.28441@lsuc.uucp> Lines: 35 Keywords: tty driver dave@lsuc.uucp (David Sherman) writes: >It's a Perkin-Elmer 3220 running "Edition VII Workbench"... >It can't grok characters >arriving at >1200 bps. For output, it's fine; I read netnews at >19200 and it's noticeably twice as fast as 9600. > >I asked P-E about it once long ago (we have source, so we don't >have software support) and was told it's a bug in the terminal >driver. The problem is with both the terminal driver and the COMMS MUX on the Perkin-Elmer(Concurrent) Hardware. The terminal driver routine (ttyrint) looks for characters in the COMMS MUX's buffer. The problem is that the COMMS MUX has a 1 (one) character buffer, so you gotta be real quick to get this character off the COMMS MUX otherwise it gets overwritten by the incoming stream of characters. The terminal driver has to be very fast. If you want to fix the problem on ED7 you really gotta tear the driver apart because of the size of your performance window (i.e. 1 character). I remember loosing characters at 600 Baud. I take it you have not upgraded to Xelos because of the address space of the 3220. This problem is cured on Xelos (as far as I can remember). Apart from understanding and sympathy there is little I can do for you!! Best of luck -m------- Ali Shirnia Phone : +41 252 373035 ---mmm----- Pyramid Technology Fax : +41 252 373135 -------mmmmmmm- UUCP : !ukc!pyrltd!ali