Re: Two new CDA's appeared on my ROM 3 GS...

[dempson@actrix.gen.nz (David Empson)]

Byron Desnoyers Winmill <wbdesnoy@acs2.acs.ucalgary.ca> wrote:

> Blake Patterson (blake@blakespot.com) wrote:
> :     The "peek at memory" (or something to that effect) and a monitor (asm)
> : appeared in my ROM 3 GS's control panel as CDA's.  Why were they not
> : there before??  I put a 256K AST RamStackPlus in there around the time
> : it happened -- but I doubt that would cause it.  
> 
> These control panels are for programmers, and I believe that they are part
> of the IIgs's ROM.  The only way I know how to enable/disable these
> control panels is to change the "Enable programmers CDAs" option in the
> SetStart control panel of GSOS 6.0.1.

That is the normal way of controlling their availability.  There is also
a monitor command (#) which enables them until you turn the machine off.

There is a minor bug the ROM 3 firmware which causes these CDAs to
appear all the time on _some_ machines.

It depends on the supposedly random contents of a particular memory
location when the machine is powered on; the majority of machines happen
to have the "right" value in this location, while a small number happen
to have the "wrong" value, causing these CDAs to be enabled all the
time.  Mitchell Spector had a machine which was affected by this
problem, and I helped him track down the cause.

-- 
David Empson
dempson@actrix.gen.nz
Snail mail: P O Box 27-103, Wellington, New Zealand