Re: GEOS...and a problem.

[supertimer@aol.com (Supertimer)]

labelas@hotmail.com (Labelas Enoreth) wrote:

>> >And does GEOS always run so dog-slow, or is it actually
>> >zippy in some configurations?
>> 
>> It runs slow unless you had a Zip Chip on a IIe.
>> 
>> On Bernie, I suppose it depends on how fast your PowerMac
>> is.  On a IIGS with a 12.5Mhz TWGS, GEOS is actually very
>> zippy.  ;-)
>>
>It seems to crawl even on a fast powermac. I was thinking this might have
>something to do with it's...um...need for an interrupt generator, but I
>really don't know exactly why it needs it since...well, I guess I just
>don't know.
>Could it be that the...interrupt generator that bernie uses is too slow?

Good question.  The FE people can answer this one....

Some background info: the interrupt generator is required for
IIe systems that lack an Apple Mouse.  The ones that have a
Mouse card don't need it.  The mouse hardware provides the
interrupt.

On the IIGS or the IIc/IIc Plus, GEOS probably gets the
interrupt signal from the fake "Mouse Card" installed in
the slot 4 firmware.

So the question is how faithful does Bernie emulate the
mouse card firmware?

I know the Laser 128EX/2 was a little off and thus if you
tried to use the Apple Mouse driver in GEOS, the mouse
cursor would drift.  GEOS had a separate driver for the
Laser.