[Coco] Aussie 2 meg installation - results

[Arthur Flexser]

The top bits of not only the DAT but the pallette GIME registers do not give
meaningful results when read.  Oddly, what gets read there depends on the exact
instruction used to do the reading.  LDB 0,X (which I think is what PEEK uses)  
gives a different result than LDB ,X as I discovered when puzzling over why the
same location would give $7x according to PEEK but $4x when read with ADOS's ML
monitor.

Art

On Tue, 11 Jul 2006, Bob Devries wrote:

> I ran the following one-liner:
> 
> 10 FOR X = 0 TO 7:PRINT HEX$(PEEK(&HFFA)+X);" ";:NEXT X
> 
> I get this result:
> 
> 78 79 7A 7B 7C 7D 7E 7F
> 
> Now, I was under the impression that I shouldn't be able to see the top two 
> bits of the DAT registers, but what *should* I see there? From this, I'd say 
> the top two bits are set to 1 and 0 respectively.
> 
> If I do : POKE &HFFA1,255
> and run the one-liner again, I get this result:
> 
> 78 7F 7A 7B 7C 7D 7E 7F
> 
> This is exactly the same as I get on my 1 Meg coco3.
> 
> Comments?
> --
> Regards, Bob Devries, Dalby, Queensland, Australia
> 
> Isaiah 50:4 The sovereign Lord has given me
> the capacity to be his spokesman,
> so that I know how to help the weary.
> 
> website: http://www.home.gil.com.au/~bdevasl
> my blog: http://bdevries.invigorated.org/
> 
> 
> -- 
> Coco mailing list
> Coco at maltedmedia.com
> http://five.pairlist.net/mailman/listinfo/coco
>