[Coco] How much memory

[Gene Heskett]

On Friday, November 26, 2010 10:52:13 pm jdaggett at gate.net wrote:
> Gary
> 
> If my memory serves me correct OS9 can access 2 Meg RAM. SECB can only
> access 512K
 
True, more or less, in practice only 128k.

> Both are limited by the GIME Chip which only accesses 512K. There are
> schemes that have expanded memory but only in banks of 512K
 
There are expansions, like the Disto 2 meg kit which I have, that does 
expand the gimes block mapping by 3 additional bits, and this then allows 
memory to be paged in and out of user space in the usual 8k blocks.  Myram 
can use the other 1.5 megs as an automaticly formatted ramdisk.

> james
> 
> On 26 Nov 2010 at 20:48, Becker, Gary wrote:
> > I was just wondering, how much memory could a CoCo3 realistically use.
> > BASIC can only address 512K. NitrOS-9 can address a lot more, but it
> > has a fixed amount of system resources and after they are used, any
> > additional RAM is wasted. A RAM drive is a good way to utilize a
> > bunch of additional RAM. Compiling C programs from a RAM drive is
> > definately a lot faster than from a HDD. Which of these three options
> > is better?
> > 
> > 1 1.5 Meg of memory that is able to run at 25 MHz.
> > 
> > 2 512K at 25 MHz and 8 or more Meg for a RAM Drive that can be
> > accessed at 3.5 MHz or less.
> > 
> > 3 Eight or more Meg of RAM that can be accessed at 3.5 MHz or less.
> > 
> > Please limit to these three options.
> > 
> > Gary
> > 
> > 
> > --
> > Coco mailing list
> > Coco at maltedmedia.com
> > http://five.pairlist.net/mailman/listinfo/coco
> > 
> > 
> > -----
> > No virus found in this message.
> > Checked by AVG - www.avg.com
> > Version: 10.0.1170 / Virus Database: 426/3282 - Release Date: 11/26/10
> 
> --
> Coco mailing list
> Coco at maltedmedia.com
> http://five.pairlist.net/mailman/listinfo/coco