Sharp MZ-5500 Tehnical Manual page 50

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ii)
Software
(1)
Since the user DMA is not at all supported by the OS, the user program
, must be deve10ped by the assembler.
(2) Assign on1y the channe1 3 for the DMAC. Never reset and mask the chaI'nel
2
wi
th the master clear command, for e xamp le .
(3)
Bef~re
the DMA, send
BOR
to the
1/0
address AEH to open the user DMA.
(4) 64KB is the maximum that can be subjected to DMA at one time.
(5) Assign the single transfer mode for the DMA operation.
tl
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