[Coco] Assembly GIME programming...

[Robert Gault]

The high resolution text screen is located at $6C000-$6E000 if created 
by the Coco ROMs. If that is the region you want to access, first decide 
where in your 64K of RAM you want it to appear, use the appropriate MMU 
registers for that RAM region, make sure that $FF90 is set for Coco3 
mode and the MMU is enabled, and make sure that the IRQs are off when 
moving around memory until it is reset.

Roger Merchberger wrote:

> Does anyone here know how to program the GIME from Assembly *without* 
> using ROM routines?
> 
> Right now, I have 2 proggies:
> 
> 1) Uses the ROM routine to pop in 80-column mode, I can map in $6C000 
> -$6DFFF into the $4000-$5FFF bank, and put text on the screen...
> 
> 2) I have a program that can create 80-column mode without using the ROM 
> routine, but the video memory isn't set where it should be; as a matter 
> of fact, by default it *looks* like it may be set to $70000 as I can see 
> some text from the 32x16 screen displayed on the 80-column screen, and 2 
> characters were "rolling" on their own like it might've been a BASIC 
> counter memory location [[ TIMER ?? ]] continuously incrementing.
> 
> I thought I saw *somewhere* how to program the GIME to set the start of 
> 80-column video memory, but either I was hallucinating or I can't place 
> it right now.
> 
> Anyone have any pointers, code samples, websites, etc. that might help 
> me out?
> 
> Thanks,
> Roger "Merch" Merchberger
> 
> -- 
> Roger "Merch" Merchberger   | "Profile, don't speculate."
> SysAdmin, Iceberg Computers |     Daniel J. Bernstein
> zmerch at 30below.com          |
> 
>