Radio Shack TRS-80 - Chapter 9: Cassette Tape Operations; Recording Programs

TABLE
5.
CARTRIDGE
CONNECTOR
SIGNALS
PIN
#
SIGNAL
NAME
DESCRIPTION
1
-12
V
-12
Volts
(100
MA)
2
+12 V
+
12
Volts
(300
MA)
3
HALT*
Halt
Input
to
the
CPU
4
NMI*
Non-Maskable
Interrupt to the CPU*
5
RESET* Main
Reset And
Power-Up Clear Signal
To The System
6
E
Main CPU
Clock
(0.89
MHz)
7
Q
Quadrative Clock Signal
Which
Leads
E
8
CART*
Interrupt Input
For Cartridge
Detection
9
+5V
+5
Volts (300 MA)
10
D0
CPU Data Bit
11
D1
CPU
Data Bit 1
12
D2
CPU Data
Bit
2
13
D3
CPU Data Bit 3
14
D4
CPU Data Bit 4
15
D5
CPU Data
Bit
5
16
D6
CPU
Data Bit
6
17
D7
CPU Data Bit 7
18
R/W*
CPU
Read
-
Write Signal
19
A0
CPU
Address Bit
20
A1
CPU
Address Bit 1
21 A2
CPU
Address Bit
2
22
A3
CPU
Address Bit
3
23
A4
CPU
Address Bit 4
24
A5
CPU
Address Bit
5
25
A6
CPU
Address Bit
6
26
A7
CPU
Address Bit 7
27
A8
CPU
Address Bit
8
28
A9
CPU
Address Bit
9
29
A10
CPU Address Bit
10
30
A11
CPU Address Bit 1
1
31 A12
CPU
Address Bit 12
32
CTS*
Cartridge Select Signal
33
GND
Signal Ground
34
GND
Signal Ground
35
SND
Sound Input
36
scs*
Spare Select Signal
37
A13
CPU
Address Bit
13
38
A14
CPU Address Bit 14
39
A15
CPU
Address Bit 15
4(3
SLENB*
Input To
Disable
Device
Selection
36