Re: IIgs & ROMBANK

["mressl@gmail.com" <mressl@gmail.com>]

Hi there,

I can't remember the source, but somewhere I read that $C028 switches
the ROM bank that is visible at E0/C000.FFFF. Normally it is taken
from FF/C000.FFFF, but according to what I read, when the ROMBANK
switch is accessed, this changes to FF/8000.FFFF.

Could somebody with a real Apple IIgs please try these commands after
booting and reseting:

CALL-151
FF/D000
E0/C028
D000

I am working on another IIgs emulator, and am trying to be as accurate
as possible to the original.

Thanks!

Marc.-

On Feb 14, 4:50 pm, "Charlie" <charlieD...@verEYEzon.net> wrote:
> <mre...@gmail.com> wrote in message
>
> 9a93d4ad-5324-4e26-9606-64bb7e565501@v46g2000hsv.googlegroups.com">news:9a93d4ad-5324-4e26-9606-64bb7e565501@v46g2000hsv.googlegroups.com...
>
> > Hi there,
>
> > does anybody know what the ROMBANK switch (C028) does on a IIgs? On a
> > IIc it switches the A14 line for the ROM, but what does it do on a
> > IIgs?
>
> According to the Apple IIGS Firmware Reference (copyright 1987) page 280,
> the ROMBANK switch ($C028) is not used in the Apple IIGS.
>
> Charlie