[OpenBIOS] Support for 16 head harddisk on OLD Interactive Unix configured for 15 head harddisk

[Hanusz L.]

Hello,

I have an old system running Interactive Unix on a 15 head harddisk (4Gb).
I would like to clone this system to a 16 head harddisk because it is now difficult to find 15 head harddisks.

The problem is that I cannot modify the system which think it has a 15 head harddisk.
I suppose that Interactive unix use the Int13 interrupt mechanism to access the disk (am I wrong ?).

I wonder if there is a possibility to modify openbios so that a 16 head harddisk is used and is simulated as a 15 head harddisk by the bios ?
I would probably have to modify the drivers/ide.c file to do a conversion.

My questions are:
-          Can openbios boot Interactive Unix ?
-          What implementation should I use ?

Thanks for any help,

Leszek Hanusz

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