Sony UP-21MD Service Manual page 44

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4-1-3. Basic Operatio
ng and CPU Biock
The operation of the digital signal processing block on the VPR-74 board is controlled and managed
according to the command from the SY board by CPU.
* VF judgment (synchronous management) of video input signal
* Output of blanking signal
Control of DRAM control circuit
Write of color adjustment data
Write of caption data
CPU memory map
The memory map of CPU is shown below.
000000
O1FFFF
200000
400000
600000
6007FF
FFECOO
FFFBFF
FFFE4O
FFFFFF