Yamaha V9938 Programmer's Manual page 76

Step 3: Select destination memory and direction from base coordinate
MSB
R#45
Step 4: Execute the LMMC command
MSB
R#46
Step 5: Send data and wait for 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.
When VDP sets TR bit of status register S#2 to "1" application can send next data to
the VDP color register R#44 (CLR). If TR bit is 0, then application should not send data
and wait till TR bit is set to 1 or terminate the command if needed.
© 1985 ASCII CORP. / NIPPON GAKKI CO.
7 6 5
0 - MXD
7 6 5
1 0 1
4 3 2
- DIY DIX
4 3 2
1 LO3 LO2 LO1
Logical operation
Page 76 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
LO0 LMMC cmd
© 2010-2015 Eugeny Brychkov