[sebhc] RGT question for Pat Swayne

West, Ronald S. RONALD.S.WEST at saic.com
Thu May 6 13:48:12 CDT 2004

This is a question for Pat Swayne or anyone else who was involved in HDOS
software development.

I am working on a device driver for an IDE port for the H8. I think its the
GRT (Group Reservation Table) that is written to a floppy when it is
initialized that essentially limits the number of groups of sectors and thus
files to 200. Does anyone know if HDOS used multiple GRT's when a drive was
large (such as the H67 winchester disk)?

Also, am I correct that HDOS itself appears to address sectors individually
using a two byte value. If that is the case the system would be limited to
65,535 sectors. With 256 byte sectors the drive size could (theoretically)
be 65,535 x 256 = 16,776,960 bytes. With 512 byte sectors we should get
twice that amount. Pretty good, actually, at 32mb! 



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