From: Ruud Baltissen (Ruud.Baltissen_at_abp.nl)
Date: 2001-04-24 08:28:44

Hallo James,

> *Locations 800, 801 and 803 always contain 170,4,170.
> (except with the hard-disk removed)

I did some research on my new PC20-III last weekend. First I found out that
TP 7.0 executables compiled on my P3 machine won't run on this XT, even when
told to complile in XT-mode :( So I installed TP 3.0 on the PC20 and wrote a
little program.

I did two runs with and two runs without HD. The last two runs gave $FF on
the above addresses, something I would expect. All other differences were
just matter of one or two bits. 800 = $0320 which is the same I/O-address
used by other XT HD-cards, IF I remember correctly.

Due to visits I hadn't that much time, so next step is to scan the ROM for
I/O instructions regarding these address. I also will have a look what
registers are found on the above addresses.

Groetjes, Ruud


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