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 http://Ruud.C64.org - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail cbm-hackers-request@dot.tml.hut.fi.
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