[Coco] Re: 64K Mode

[John E. Malmberg]

jdaggett at gate.net wrote:
> John
> 
> According to the diagram that I have in the 1983 databook it shows 
> that the ram in memeory map type 0 as two pages of ram at $0000 
> to $7FFF. Unless this is inerror then that is what I am basing mt 
> posts on. 

> Rom seems to remain constant in memory Map type 0 In memory 
> map type 1 the ROMs are wswitched out and ram is mapped from 
> $0000 to $FDFF. 

We are basically saying the same thing.

You have a choice of 64K Dynamic RAM, or upper 32K ROM/static RAM and 
either the upper or lower 32 K of the 64K Dynamic RAM in the lower.

The 32K segment where the ROMs normally reside could also have static 
RAM in it.

It should be possible to run a second copy of BASIC in the other 32K 
with an interrupt or other means to switch between them.

-John
wb8tyw at qsl.net
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