Posted By
Litwr
on 2017-02-19
08:28:43
|  Re: DRAM regeneration at C+4/16
It is an interesting opportunity to disable DRAM refreshing and to get 5-7% speed gain. This requires to write self refreshing programs or using a special interrupt routine. However it is impossible with TED. This feature presents in the world of Dragons or CoCo though.
IMHO 5 ticks per a raster line are too much. Even one tick per a line is enough. However I do not completely understand that TED may read ROM during refreshing accesses. This may cause DRAM content loss for longtime ROM routine.
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