[sebhc] H17 ROM ?

West, Ronald S. RONALD.S.WEST at saic.com
Fri May 21 08:43:29 CDT 2004


Look in the PAM-37 Panel Monitor Operation/service Manual. That book
contains a listing with routines for and references to all the disk types.


> -----Original Message-----
> From: sebhc at sebhc.org [mailto:sebhc at sebhc.org] On Behalf Of 
> Dave Dunfield
> Sent: Friday, May 21, 2004 8:31 AM
> To: sebhc at sebhc.org
> Subject: [sebhc] H17 ROM ?
> I've been disassembling the H17 ROM (found it in the archive),
> 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.
> I had been assuming that the ROM would contain all the disk 
> functions, so that the operating system could access the disk 
> no matter which controller/drive you had installed - ie: it 
> would provide a level of abstraction.
> 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?
> Regards,
> Dave
> -- 
> dave04a (at)    Dave Dunfield
> dunfield (dot)  Firmware development services & tools: 
com             Vintage computing equipment collector.

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