X1 Memory Mapping (Size and Bank)
1 A10
2 U11 (LS138) pin 1
3 A11
4 U11 (LS138) pin 2
5 A12
6 U11 (LS138) pin 3
7 A13
8 U10 (LS20) pin 2
9 A14
10 U10 (LS20) pin 4
11 A15
12 U10 (LS20) pin 5
13 A13\
14 U10 (LS20) pin 1
15 A14\
16 A15\

X2 ROM Type
1 +5
2 +5
3 ROM pin 19
4 A10
5 ROM pin 18
6 A11
7 ROM pin 21
8 A12
9 GND
10 GND

X3 Chip Selects (Drives Phantom)
1 Select 0 (U11 pin 15)
2 ROM 0 Low (CS\ ROM 0)
3 Select 1 (U11 pin 14)
4 ROM 1 Low (CS\ ROM 1)
5 Select 2 (U11 pin 13)
6 ROM 2 Low (CS\ ROM 2)
7 Select 3 (U11 pin 12)
8 ROM 3 Low (CS\ ROM 3)
9 Select 4 (U11 pin 11)
10 ROM 0 High (CS\ ROM 0)
11 Select 5 (U11 pin 10)
12 ROM 0 High (CS\ ROM 1)
13 Select 6 (U11 pin 9)
14 ROM 0 High (CS\ ROM 2)
15 Select 7 (U11 pin 7)
16 RAM High

X10 RS-232 TXClock
1 (DD)
2 USART TXC
3 CTC TO0 (Conditioned by U15)

X11 RS-232 DSR\ (1 to 2 allows monitor to measure bit rate)
1 USART RXD
2 USART DSR\
3 (CD)

X15 Auto Start
1
2
3
4

X16 Auto Start
1 U22 (LS74) pin 9
2 U32 (LS32) pin 4
3 A13

X17 Auto Start
1 U22 (LS74) pin 9
2 U32 (LS32) pin 1
3 A15

X18 Auto Start
1 U22 (LS74) pin 9
2 U32 (LS32) pin 13
3 A12
4 U22 (LS74) pin 9
5 U32 (LS32) pin 10
6 A14

X20 RS-232
1 USART TXD\
2 USART RXD\
3 USART RTS\
4 USART CTS\
5 USART DTR\
6 USART DSR\
7 USART TXC
8 USART RXC
9 (CE)
10 +12V
11 (CF)
12 (DB)
13 (DD)
14 (DA)
15 (CD)
16 (CC)
17 (CA)
18 (CB)
19 TXD (BA)
20 RXD (BB)

X21 USART Clock Source
1 (DD)
2 USART RXC
3 CTC TO0 (Conditioned by U15)