Hi Brenton,
            I was still in trouble with the modified IDE card. What
speed do these things run at?

  I ended up XOR'ing an inverted address bit 9 with bits 3 & 4. This
inverts 3 & 4 for IDE (168 to 1FO) and passes the higher addresses
unchanged, but although it worked, my test to backup a few megs of
CD to floppy and run a compare failed.

  XOR gates are slow. The CMOS 4070 I used at 5V is good for 120nS
(about the same as 74L). I replaced it with a 74HC86 which does 20nS
at 5V... and it works now. Going from 120nS (8MHz) to 20nS (50MHz)
made the difference. How fast do these bloody CD-ROMs have to be?

  It's bloody stupid! The CD ROM wouldn't run off the VESA card in
Mode-4 because it was too slow, and then it wouldn't run with ordinary
CMOS because it was too fast!

  Anyway, *FINALLY* I've got the fucker working. Both hard drives run
Mode-4 with 1500kb/s transfers, the CD-ROM is reliable, and I've got
lots of extra ports to run my ACAD dongle.

Regards,
Bob

___ Blue Wave/QWK v2.12
@EOT:

---