Canon A-200 series Service Manual page 77

PAD through PA7 terminals of the port A determines whether it selects a shift register U94 or
the status of the DIP switch, depending on the logical level of the PB7 terminal. When this termi ­
nal is LOW, it selects the former, and when HIGH, the later:
For more detailed information concerning the DIP switches, refer to "Summary of DIP Switch
Setting" in Part IV of this manual.
PPI
OIP Sw1
Interrupt [
PC7
Control
Circuit
PC6
PIT·OUT2
PC5
NC
PC4
PC3
PC2
PC1
PCO
] K/B
Interface
07
06 PB6
05 PB5
] Interrupt
Control
D4 PB4
Circuit
D3
PB3
NC
02
PB2
NC
01
PB1
To 70
Speaker
Oriver
00 PBO
PIT·G2
AO or BAO
AO
A 1 or BA 1
A1
10R·N RO
10W·N WR
PPI
CS
Figure 6-22
74