Now run DMA stable only with fast block transfer (disconnect CPU and
stransfer data). I will test soon also byte mode = DMA transfer only one
byte and return to CPU. I must make counter which set speed of DMA
transfer.
Yes, is possible also make external DMA interface
VELESOFT
Dne 9. 8. 2015 v 3:06 Simon Owen napsal(a):
Very interesting. I didn't expect it to work well enough to be of use
on SAM, given how limited memory accesses are. Does the CPU manage to
run at all while the DMA is active?
Is it possible to achieve the same result with an external board
replacing the internal CPU? My soldering skills aren't up to replacing
the existing CPU with a socket!
Of course, your news might trigger you-know-who into action again...
Si
On 08/08/2015 23:46, VELESOFT wrote:
Here is my version of DATA-GEAR (Z80 DMA interface for SAM COUPE).
It's internal version for connection instead original Z80CPU (need
replace CPU with socket).
http://velesoft.speccy.cz/other/dma%203Trd+3Twr-long.png
VIDEO (sorry, bad quality and low FPS). Almost fullscreen scroll 25
fps on real sam coupe.
http://velesoft.speccy.cz/other/DMA_SAM_001.MPG
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