No, but DMA chip enable hardware scroll, fast transfer of data block
between memory or I/O ports, search data...
DATA-GEAR versionn for SAM COUPE also contain RESET debouncer, NMI
debouncer, possibility connect new button with ZX reset (no reset SAM,
but only reset Z80 CPU), jumper for
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
DMA transfer in MODE4 (time in border area = fast memory) transfer one
byte per 8T
http://velesoft.speccy.cz/other/dma%203Trd+3Twr-mode4.png
DMA transfer in MODE4 (time in screen area = contended memory) transfer
one byte per 16T
