Re: PC20-III

From: Ruud Baltissen (
Date: 2001-04-18 07:40:46

Hallo James,

Could you do me a small favour? You will need a little programming skills
but even GW-BASIC will do. You must write a program like this:

10 for I=256 to 1023
20 print(in(I)); " ";
30 next
40 end

This little program reads the I/O addresses from $100 to $3FF. Then you have
to make a bootable floppy with GW-BASIC (or whatever you use) and run it
with and without the harddisk. The IDE-harddisk has eight registers. My hope
is that the two runs show enough differences to trace where the interface is
situated. Once this is known, one can scan the BIOS for I/O-operations on
these addresses.

I'll first have to find another 720 drive as mine probably is brooken:
sometimes it wil, sometimes it won't boot. As I don't have an original HD,
I'll then try the above trick with another one.

Groetjes, Ruud

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