[sebhc] H17 ROM ?

Patrick Rigney patrick at vintagecomputermarketplace.com
Fri May 21 11:50:00 CDT 2004

> As far as I can tell, it has very little to do with the disk 
> hardware - it appears to be chock full of various utility 
> subroutines (like divides etc.) but almost no disk functions. 
> Just a little boot stub at the end.

Dave, for me the most useful resource in playing directly with the H17
hardware has been the CP/M BIOS listing, which contains nearly line-by-line
comments in its functions.

> Poking through the Mac emulator documentation it looks as if 
> HDOS has it's own drivers for the hardware.


> So: How does HDOS handle the different disk controllers?
> Do you need a differently configured HDOS diskette for the 
> different controllers?

Different drivers.  Which disk subsystems your machine supports is a
function of which drivers (.DVD files) are on the diskette from which you


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