[Coco] Bubble Memory

Zippster zippster278 at gmail.com
Tue Aug 15 11:21:23 EDT 2017


It was never really thereā€¦  Anything involving over 64K will involve banking of
some sort.  The 32K blocks have to be just a limitation of the scheme they used
in this case.

You can bank 2MB in 8K banks without having to resort to registers larger than
8 bits.

- Ed

> On Aug 15, 2017, at 10:12 AM, Brett Gordon <beretta42 at gmail.com> wrote:
> 
> that limit is done and gone no?  Tormod's spinx card now can map near 64k
> in and out.  I assume it would be trivial now-a-days to add more granular
> banking if one desired, or a crap ton of banked memory.
> 
> Actually putting any such scheme to use software-wise would be probably
> more work than the hardware involved.
> 
> On Aug 15, 2017 8:31 AM, "Bruce W. Calkins" <brucewcalkins at charter.net>
> wrote:
>> 
>> One of the limits to the CoCo 1 & 2 memory expansion was the inability to
> shift small-to-medium sized blocks in and out of the memory map.  Basically
> it was limited to 32k mapping blocks.  This applied to the PBJ 128k & 256k
> expansions too.  That said; RAM Disks really did speed up many processes.
>> 
>> Bruce W.
> 
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