TRS-80 Color Computer 1/2/3 ROM-PAK Slot Pinout
 
PIN	SIGNAL DESCRIPTION 
1	N.C. (-12 VDC on CoCo 1 and 2) 
2	N.C. (+12 VDC on CoCo 1 and 2) 

3	HALT* Halt input to the CPU 
4	NMI* Non-Maskable Interrupt to the CPU 
5	RESET* Main Reset and Power-up Clear 
6	E CLOCK Main CPU Clock 
7	Q CLOCK Clock which leads E by 90 degrees 
8	CART* ROM PAK Detection Interrupt 

9	+5 VDC +5 Volts DC (300 mA) 

10	DATA 0 CPU Data Bus - Bit 0 
11	DATA 1 CPU Data Bus - Bit 1 
12	DATA 2 CPU Data Bus - Bit 2 
13	DATA 3 CPU Data Bus - Bit 3 
14	DATA 4 CPU Data Bus - Bit 4 
15	DATA 5 CPU Data Bus - Bit 5 
16	DATA 6 CPU Data Bus - Bit 6 
17	DATA 7 CPU Data Bus - Bit 7 

18	R/W* CPU Read/Write Signal 

19	ADDR 0 CPU Address Bus - Bit 0 			0
20	ADDR 1 CPU Address Bus - Bit 1 			1
21	ADDR 2 CPU Address Bus - Bit 2 			2
22	ADDR 3 CPU Address Bus - Bit 3 			3
23	ADDR 4 CPU Address Bus - Bit 4 			4
24	ADDR 5 CPU Address Bus - Bit 5 			5
25	ADDR 6 CPU Address Bus - Bit 6 			6
26	ADDR 7 CPU Address Bus - Bit 7 			7

27	ADDR 8 CPU Address Bus - Bit 8 			0
28	ADDR 9 CPU Address Bus - Bit 9 			1
29	ADDR 10 CPU Address Bus - Bit 10 		2
30	ADDR 11 CPU Address Bus - Bit 11 		3
31	ADDR 12 CPU Address Bus - Bit 12 		4
37	ADDR 13 CPU Address Bus - Bit 13 		5
38	ADDR 14 CPU Address Bus - Bit 14 		6
39	ADDR 15 CPU Address Bus - Bit 15 		7


32	CTS* Cartridge (ROM) Select Signal 
33	GROUND Signal Ground 
34	GROUND Signal Ground 
35	SND Cartridge Sound Input 
36	SCS* Spare Cartridge (DISK) Select Signal 

40	SLENB* Input to Disable Internal Devices