Vector 4 - Page 35

EXHIBIT [I-2 SBC TIMING
VIDEO CYCLE CPU CYCLE
VIDEO CYCLE
1. MAO-MA7 * addresses are used as a lower
8-bit address for VIDEO Memory.
MAO-MA7 addresses are used as an upper 8-bit
address for VIDEO Memory.
The VIDEO can access the memory- 16 bits
wide,
In the Alpha Mode (character set generated by
character generators) a 8-bit ASCII value is
decoded and sent out through the video
connector to the CRT.
* "M" Indicates these lines are multiplexed.
CPU CYCLE
1. MAO-MA7 addresses are used as a lower 8-bit
address for CPU Memory.
2. MAO-MA7 addresses are used as an upper 8-bit
address for CPU Memory.
3. The CPU can access the memory to execute a
Memory READ or Memory WRITE.
4, In the Alpha Mode a 8-bit ASCII value is
decoded and sent out through the video
connector to the CRT.
I1-6