Yamaha V9938 Programmer's Manual page 74

MSB
R#44
Step 3: Select destination memory and direction from base coordinate
MSB
R#45
Step 4: Execute the command
MSB
R#46
Step 5: Wait for command execution completion
While command is being executed by VDP, CE bit of status register S#2 will be set to
1. When command is complete, it will be reset to 0.
© 1985 ASCII CORP. / NIPPON GAKKI CO.
7 6 5
CR7 CR6 CR5
X=2N
CR7 CR6 CR5
X=4N X=4N+1
CR7 CR6 CR5
X=N (One dot)
7 6 5
0 - MXD
7 6 5
1 1 0
4 3 2
CR4 CR3 CR2
X=2N+1
CR4 CR3 CR2
X=4N+2
CR4 CR3 CR2
4 3 2
- DIY DIX
4 3 2
0 - -
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1 0 LSB
CR1 CR0 G4, G6
(N=0..127)
CR1 CR0 G5 (N=0...127)
X=4N+3
CR1 CR0 G7
1 0 LSB
- -
0: Right X transfer
direction
1: Left
0: Down Y transfer
direction
1: Up
0: VRAM Destination
select
1: ExpRAM
1 0 LSB
- - HMMV cmd
© 2010-2015 Eugeny Brychkov