Re: Auxiliary zero page locations

[BluPhoenyx <bluphoenyx@earthlink.net>]

mdj wrote:
> BluPhoenyx wrote:
> > mdj wrote:
>
> > This should work the same for Apple 64k aux ram as it does for RamWorks
> > memory cards. In fact, the 2c and 2e are probably using the 64k bank
> > supplied with the 80 column video anyhow.
>
> Indeed - the issue is whether or not the region is fooled with by any
> firmware or operating system code. In theory at least, the 80-column
> firmware doesn't mess with it, as it should work ok with just a 1k AUX
> card installed.
>
> The area is flagged as reserved by the Operating System in any
> documentation I've got, but I'm unsure of exactly what, if anything
> used it.
>
> One possibility is the /RAM driver, but I'm unconcerned by this as it's
> easily disabled.
>
> Any others?

AFAIK, the //c would be the most problematic as it uses some aux ram for 
serial ports and keyboard buffering. I don't recall if the code uses the 
aux stack or zero page.

I can't think of any other problems but others here have more knowledge 
of this than I do. I think it might be useful to run the whole system in 
aux ram leaving the majority of main ram free. Please keep us informed. 
I am always looking for code which uses aux ram.

Cheers,
Mike T.