Figure 104. z80 zio/1 pin assignments – Zilog Z08470 User Manual
Page 237
Z80 CPU Peripherals
User Manual
UM008101-0601
Serial Input/Output
217
Figure 104. Z80 SIO/1 Pin Assignments
Z80 – SIO/1
CH-A
RxDA
RxCA
TxDA
TxCA
SYNCA
W/RDYA
RTSA
CTSA
DTRA
DCDA
RxDB
RxTxCB
TxCB
SYNCB
W/RDYB
CTSB
DCDB
RTSB
12
13
15
14
11
10
17
18
16
19
30
24
23
22
28
27
26
29
CH-B
CPU
Data
BUS
SIO
Control
D0
D1
D2
D3
D4
D5
D6
D7
CE
RESET
M1
IORQ
RD
5V
GND
INT
IEI
IEO
F
40
1
39
2
38
3
37
4
35
21
31
20
5
6
7
8
36
32
9
from
CPU
Daisy
Chain
Interrupt
Control
Modem
Control
TxDB
25
Modem
Control
33
34
C/D
B/A