Terry & Utahna <tolsen64@hotmail.com> wrote:

> Well, I'd be doing it in P8...so a toolbox call won't help...

You can call the ROM-based parts of the toolbox from ProDOS-8.  This
includes the Miscellaneous Toolset, which contains the clock access
functions.  There is no other supported method of setting the IIgs
clock.

If the machine is booted directly into ProDOS-8 (rather than via
launching a P8 application from GS/OS) then some extra setup is required
to get through the startup sequence: you have to call NewHandle to
allocate handles for the main area of banks 0 and 1 before you can start
up the Memory Manager, and that is required before starting up the
Miscellaneous Toolset.

I remember posting example code for doing this, but it was a long time
ago.  Google probably has an archive copy.  (I will have a copy if it
was after I started using the Mac for news.)

-- 
David Empson
dempson@actrix.gen.nz