Yamaha V9938 Programmer's Manual page 84

Step 3: Select destination memory and direction from base coordinate
MSB
R#45
Step 4: Execute the command
MSB
R#46
Step 5: Check for command completion
CPU should check CE bit of status register S#2 to identify if VDP has completed
execution of the command. When command is being executed, CE bit is set to 1; when
command is complete, CE bit will be reset to 0.
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7 6 5
0 - MXD
7 6 5
1 0 0
4 3 2
- DIY DIX
4 3 2
0 - -
Page 84 of 108
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
- - LMMV cmd
© 2010-2015 Eugeny Brychkov