wdm@icc.com (Bill Mulert) (05/29/91)
On a stock SCO Xenix 2.3.2 system, the line printer driver is configured to use IRQ5. In order to free up IRQ5 for additional hardware, I need to move the printer driver to IRQ7. When I edit the master file, and change the pa entries for vec1 and vec2, I get a kernel that fails to boot. I have tried setting vec1 to 7 and vec2 to 0, and vec to 0 and vec2 to 7. No deal. Can anyone advise me on how to free up IRQ5 but still have an operational printer driver? -- Bill Mulert wdm@icc.com Intercomputer Communications Corp. Cincinnati, Ohio 45236 513-745-0500
bill@camco.Celestial.COM (Bill Campbell) (05/31/91)
In <1991May29.150702.1691@icc.com> wdm@icc.com (Bill Mulert) writes: >On a stock SCO Xenix 2.3.2 system, the line printer driver is >configured to use IRQ5. In order to free up IRQ5 for additional >hardware, I need to move the printer driver to IRQ7. When I >edit the master file, and change the pa entries for vec1 and >vec2, I get a kernel that fails to boot. I have tried setting >vec1 to 7 and vec2 to 0, and vec to 0 and vec2 to 7. No deal. /dev/lp0 and /dev/lp1 are generally configured to IRQ7 and /dev/lp2 to IRQ5 (at least on every system I've seen). >Can anyone advise me on how to free up IRQ5 but still have an >operational printer driver? The best solution I've come up with is to scrap the parallel printer ports and hang the printers off a smart multi-port board using serial->parallel buffers (I use Intellicom 16K buffers). I've seen (and am currently trying to find a fix for) slow printing problems under Xenix (2.3.3UFM) with certain printer port boards. I've also had problems using the parallel printer port when printing fax graphics files (slow system and screws up the VGA board). Considering the limited intelligence of many DOS targeted products (mice that must use IRQ2-5...) it makes sense to me to disable the parallel ports, COM1, and COM2 releasing IRQ3,4,5,7 for other devices. Hang everything off a smart-port (I use Specialix). I have a fax modem, Trailblazer, T1600 modem, 2 printers, and several terminals on one here taking a single slot in the system and NO IRQs. The printers are all being driven at 38,400. Bill -- INTERNET: bill@Celestial.COM Bill Campbell; Celestial Software UUCP: ...!thebes!camco!bill 6641 East Mercer Way uunet!camco!bill Mercer Island, WA 98040; (206) 947-5591