[Coco] What would a CoCo successor have to have as a minimum?
gheskett at wdtv.com
Sun Nov 21 19:02:19 EST 2010
On Sunday, November 21, 2010 06:51:10 pm Mark McDougall did opine:
> On 22/11/2010 9:03 AM, Theodore (Alex) Evans wrote:
> > You can reduce memory contention through a
> > number of means. For one thing there is such a thing as dual-port
> > memory.
> Which is very, very expensive. You won't be slapping 1/2 Meg of
> dual-port memory on a board, believe me!
AIUI, with the fpga, we could well simulate the dual port by interleaving
the writes with the reads, essentially using the memory as a large depth
fifo. I don't see that as a problem other than implementing the concept on
one corner of the fpga. This might be a good excuse to learn about the
Propeller chip and use it to handle the gfx from primitives fed from the
6x09. That 'limitation' would tend to enforce the 'feel' of a coco anyway.
> > Maybe it is that I see higher resolutions as useful for other things
> > than video games.
Agreed, but I don't think that should be carried to any more extreme than
it takes to support an economy lcd monitor these days, which seems to be
1024(or a bit more for the wide screen models, we should shoot for square
pixels in any event) x768.
> Perhaps, but you need to design for the worst case. A high resolution
> screen would be handy for developing (editing) and word processing. But
> even then, you might be moving/scolling windows with hundreds of kB of
> graphics data...
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