Micro Data PC230 (South Australian computer)
thrashbarg at kaput.homeunix.org
Wed Jul 23 23:08:43 CDT 2008
A while ago I got one of these off a friend of a friend and got it going a few
days ago. I was wondering if anyone had any information about it,
specifically a technical reference manual. I'd like to have a closer look at
its architecture, just out of curiocity and for this...
The hard disk interface is a WD33C93 and has a BIOS to let MS-DOS access it.
It currently has its original 20MB Miniscribe hard drive internally and I
attached an external 140MB 5.25" SCSI drive.
Just as an experiment, I attached a CD-ROM drive to it and set the number of
SCSI drives to three. It detected the CD-ROM drive when there was a disk in
it, but MS-DOS doesn't natively support ISO9660 drives. So I made a 20MB hard
disk image in QEMU, partitioned it in FDISK and formatted it, then burnt the
image to a CD. MS-DOS detected it as a drive first go. This shouldn't be a
surprise if you know a thing or two about the SCSI architecture.
This makes me wonder if there's such thing as an ISO9660 extension for MS-DOS
that will let me access CD's in this way. The issue is if I don't have a disc
in the CD-ROM drive when it boots it will fail to detect the drive.
The other option is writing a driver for the WD33C93...
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