Re: What do you get when you access RAM that isn't there?

[Tilghman Lesher <tilghman@nospam.the-tilghman.com>]

Andy McFadden wrote:

> Dosius <steve@dosius.zzn.com> wrote:
>> Let's say you have a 32K system and you access byte $8000 of RAM.
>> Obviously there's nothing there, so what happens?  I'm just curious,
>> but perhaps I can see what happens when one uses a 32K, 16K, or even
>> 4K Apple ][, just for the hack value. :)
> 
> If memory serves, it was a pattern of largely 00 and ff bytes, with
> some semi-random other junk.  I can't remember if the results were
> stable.

On the IIgs, if a bank of memory doesn't exist, the bank number is
repeated in every memory location.  For example, bank 40 doesn't
exist on my 2MB ROM 01, so listing 40/0000.0010:

40/0000:40 40 40 40 40 40 40 40-@@@@@@@@
40/0008:40 40 40 40 40 40 40 40-@@@@@@@@

-Tilghman