Re: Sider (Xebec/Datamac SASI) drive and UCSD Pascal 1.1 (Apple Pascal)

[msg <msg@REMOVETHIScybertheque.org>]

Results of experiment:

> 
> It appears that I should try to generate an ATTACH.DATA which
> specifies units 4, 5, 11, and 12 and boot with this as the next
> experiment.
> 

A boot floppy was made containing the drivers and this
new ATTACH.DATA; Pascal unit numbers for the Xebec volumes were
set (using the DOS3.3 utility) to 4, 5, 11, and 12. Booting from
this floppy, only Xebec volumes 11 and 12 are visible (mounted),
volume 4 remains floppy A (and volume 5 is not visible as
there is no floppy B). The attach process evidently won't
override an existing binding.

If the unit numbers for the drive are set to 9, 10, 11, and 12,
and the system is booted using the same floppy, the results are
as above.

Since the original boot area writing program simply writes a
snapshot of the running system, it is possible that the
installation software would have patched the boot image
once written. If necessary, one could disassemble
XBOOT.COM.CODE for clues on accessing this area.  As an
alternative, does anyone believe it is possible to
alter unit assignments on a running system (so that
the snapshot written to the boot area would not require
patching)?

Michael