Re: Installing GS RAM card in slots 1-7

["Charlie" <charlieDOTd@verEYEzon.net>]

"Alex Freed" <alex_news@mirrow.com> wrote in message 
news:hti2lt$jlf$1@adenine.netfront.net...
>>
>> To maybe answer my own question:  I suppose the CB card is 
>> picking up the writes that a program is making to the video 
>> memory and using that to generate the VGA output.  If that is the 
>> case then I needn't be concerned with the concurrent accesses to 
>> AUX memory and main memory.
>>
>
> Correct. The CB card has its own memory and very fast one at that. 
> And wide.
> All the video data written by the 6502 appears on the same bus and 
> goes into the odd and even banks depending on the soft switches 
> that the CB also understands.

Thanks for confirming that.

> So displaying DHR graphics by CB is not too difficult - the basic 
> timing is mostly the same as the 80 col text mode. The reason I 
> didn't implement it was that I didn't have time to implement the 
> color mapping.
> Not trivial if one wants to mimic the artifacts, etc.

I'm finding that out :-)

> Wanted to do it later but had too much real work to do.

I hate when that happens,

Charlie