Figure 105. z80 sio/2 pin functions, Figure 105 – Zilog Z08470 User Manual
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Serial Input/Output
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Figure 105. Z80 SIO/2 Pin Functions
Z80 SIO/2
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
D0
D2
D6
D4
IORQ
B/A
C/D
RD
GND
W/RDYB
RxDB
RxCB
TxCB
TxDB
DTRB
RTSB
CTSB
DCDB
RESET
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
D1
D3
D7
D5
INT
IEI
IEO
M1
VDD
W/RDYA
SYNCA
RxDA
RxCA
TxCA
TxDA
DTRA
RTSA
CTSA
DCDA
F
CE