Cartridge Connector Signals - Radio Shack TRS-80 Service Manual

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TRS-BO
®
Service Manual
PIN # SIGNAL NAME
DESCRIPTION
1 N/C
2
N/C
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 0
11
Dl 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 0
20
Al
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 AS
CPU Address Bit 8
28
A9 CPU Address Bit 9
29
A10 CPU Address Bit 10
30
Al 1
CPU Address Bit 11
31 A12
CPU Address Bit 12
32 CTS* Cartridge Select Signal
33 GND
Signal Ground
34 GND
Signal Ground
35 SND Sound lnout
36 scs*
Spare Select Signal
37
A13 CPU Address Bit 13
38 A14
CPU Address Bit 14
39
A15
CPU Address Bit 15
40 SLENB*
Input To Disable Device Selection
Table 3. Cartridge Connector Signals
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