Xref: utzoo comp.unix.i386:1496 comp.unix.xenix:8811 comp.sources.wanted:9621 Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!iuvax!watmath!looking!brad From: brad@looking.on.ca (Brad Templeton) Newsgroups: comp.unix.i386,comp.unix.xenix,comp.sources.wanted Subject: Re: Fast parallel driver for Unix/Xenix AT? Message-ID: <55025@looking.on.ca> Date: 1 Dec 89 07:00:09 GMT References: <256ADBB5.19093@ateng.com> <289@marvin.moncam.co.uk> <25747D15.4126@ateng.com> Organization: Looking Glass Software Ltd. Lines: 13 Class: information,original On SCO Unix 3.2, the parallel performance was dreadful to my laserjet. The reason is the IPL level. The kernel is compiled with serial ports at an IPL level of 7 (the highest) and the printer at level 2 or 3, I think. Raise the IPL level to 5, and you can print quickly. Of course, SCO 3.2.0 has an annoying bug of not being able to handle bytes with the MSB turned on, so you have to write a filter, and that's a pain, so going to 19.2k serial may be the way to go anyway, particularly if you have a smart serial card. -- Brad Templeton, ClariNet Communications Corp. -- Waterloo, Ontario 519/884-7473