Posted By
Litwr
on 2017-02-18
09:27:43
|  Re: A mathematical demo
We are discussing 6809 code optimization and the problem of DRAM regeneration of SAM based computers primarily. We don't discuss 6502 or even 65816 code optimization. So we are definitely OT here.  In addition, our discussion relocated to Dragon forum may help to get access to genuine hardware.
Pi-demo uses only the next Y related instructions
ldb 1,y
ldb ,y
std ,y
subd ,y
leay -2,y
in the main loop. All of them have the same clocking with X.
I agree that the screen memory maybe corrupted but I am not sure. I don't have a Dragon and asked to help with genuine hardware.
4510 does a speed up about 25% with existing code. SY6516/6509 had to do the same speed up -- http://plus4world.powweb.com/forum/32844#32961
IMHO 65C02 and 65816/65802 were a shame. The upgrades might be much better if MOS Technology might survive.
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