Appendix C
PC Statements and Refresh Timing
118
PC STOP
After the ON PC GOSUB statement is executed, the PC’s categorized number allocation is written in. When the
Write flag is set, the ASCII Unit busy flag is set for one cycle time, but the GOSUB statement is not executed. Only
after the PC ON statement is executed will the ON PC GOSUB statement be executed.
I/O Refresh
I/O Refresh
I/O Refresh
Instruction Execution
Instruction Execution
Instruction Execution
ASCII Unit
C500 CPU
I/O Refresh
PC STOP Statement Execution
PC STOP Statement Execution
Categorized Number Al-
location (word n bit 04
to 07)
WRITE Flag (word n bit 01)
ASCII Unit (word n+3 bit 00)
Summary of Contents for C500-ASC04
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