wjm 19-sep-1997 There are two patches to VMS V5.5-2 DKDRIVER (i.e. the SCSI disk driver) in this directory, DKDRIVER-ZIP.0552_COM DKDRIVER-ZIP-SP.0552_COM (Note that these are ASCII files!). --- The first patch, DKDRIVER-ZIP, is my 'hobbyist' attempt to eliminate several "old-fashioned" restrictions that VMS V5.5-2 would place on the choice of "supported" SCSI disks. The patch got its name because I've successfully driven an IOMEGA ZIP 100 drive with it. Of course I can't "warrant" any particular setup, or do qualification testing ala DEC, but it may well be that disks with ARRE & AWRE mode bits set, disks not returning C/H/S geometry, and possibly even MO disks that would at least annoy their users by filling the error log with messages about "recovered" errors, may profit a lot from the patch. Usage (*NO GUARANTEES*): Create []DKDRIVER-ZIP.EXE via $ PATCH @DKDRIVER-ZIP.0552_COM and make it into SYS$LOADABLE_IMAGES:DKDRIVER.EXE (don't discard the original DKDRIVER.EXE !!!). Reboot. --- The second patch, DKDRIVER-ZIP-SP, simply extends DKDRIVER-ZIP by _permanently_ clearing the ARRE and AWRE "error recovery" bits of SCSI disks that happen to have them set, and are therefore considered inoperable by VMS versions prior to V7.1 (or so). This behaviour comes handy if you want to run a disk, whose only "problem" is with ARRE and/or AWRE, on another pre-V7 VMS machine with DEC's DKDRIVER. Create []DKDRIVER-ZIP-SP.EXE in a fashion completely analogous to []DKRIVER-ZIP.EXE (above). I'm not proposing to permanently use it for SYS$LOADABLE_IMAGES:DKDRIVER, but when you _do_ want to reset the bits, copy the file there, reboot, and MOUNT/FOREIGN the SCSI disk in question just once - it should now have the "error recovery" behaviour desired by pre-V7 VMS ever after. --- Testing out a SCSI disk driver is particularly convenient with a VAX that has a non-SCSI system disk (so a changed DKDRIVER can't make it un-bootable). Among the 'hobbyist' VAXen, I'd recommend a VAXstation 2000 or microVAX 2000. Find a SCSI port driver for its "tape controller" in my PK2K directory (also for VMS V5.5-2). Wolfgang J. Moeller, Tel. +49 551 2011516 or -510, moeller@gwdvms.dnet.gwdg.de GWDG, D-37077 Goettingen, F.R.Germany | Disclaimer: No claim intended! ----- -----