Yamaha V9938 Programmer's Manual page 68

Flowchart of HMMC execution from CPU point of view
HMMC Start
Set up VDP registers
Execute command
Read status register #2
Yes (CE=0)
End of
command?
No (CE=1)
No (TR=0)
Transmit
ready?
Yes (TR=1)
Data transmit (R#44)
HMMC End
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