B-2. Connector Pin Assignments - Tandy 102 Service Manual

B-2. Connector Pin Assignments
B-2-1. System Bus Interface
Pin No. Symbol Description
1 VDD
2 VDD
3
GND
4
GND
5
DO Address and data signal bit 0
6
D1
Address and data signal bit 1
7
D2
Address and data signal bit 2
8
D3 Address and data signal bit 3
9 D4 Address and data signal bit 4
10 D5 Address and data signal bit 5
11
D6
Address and data signal bit 6
12
D7 Address and data signal bit 7
13 A8 Address signal bit 8
14 A9 Address signal bit 9
15
AlO
Address signal bit 10
16
All Address signal bit 11
17 A12 Address signal bit 12
18
A13 Address signal bit 13
19 A14 Address signal bit 14
20
A15 Address signal bit 15
21 GND
22 GND
23
RD Read enable signal
24 WR Write enable signal
25 10/M I/O or memory select signal
26
SO Status 0 signal
27 ALE Address latch enable signal
28
Si
Status 1 signal
29
CLK CLock signal
30
IOCONT
I/O controller select signal
31
E I/O or memory access enable signal
32 RESET Reset signal
33
INTR Interrupt request signal
34
INTA Interrupt acknowledge signal
35
GND
36
GND
37
RAMRST RAM enable signal
38
NC
39
NC
40
NC
Table B-1. System Bus Connector Pin Assignments
2
4 6
8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40
1
3 5 7
9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39
Figure B-2. System Bus Connector
B-2