# CDTV Diagnostic Slot

(At the computer)

80 PIN ??? CONNECTOR at the computer.

Pin | Name | Description
--- | --- | ---
1 | GND | Ground
2 | GND | Ground
3 | VCC | +5 VDC
4 | VCC | +5 VDC
5 | /CFGOUT | Configout AutoConfig signal (not connected)
6 | /CFGIN | Configin AutoConfig signal (grounded)
7 | GND | Ground
8 | CCKQ | 3.58 MHz CCKQ clock (C3)
9 | CDAC | 7.16 MHz CDAC clock (90° before system clock)
10 | CCK | 3.58 MHz CCK clock (C1)
11 | /OVR | Override (Disables /DTACK generation of Gary)
12 | XRDY | External Ready (Generates wait states while low).
13 | /INT2 | Level 2 Interrupt
14 | n/c | not connected
15 | A5 | Address Bus 5
16 | /INT6 | Level 6 Interrupt
17 | A6 | Address Bus 6
18 | A4 | Address Bus 4
19 | GND | Ground
20 | A3 | Address Bus 3
21 | A2 | Address Bus 2
22 | A7 | Address Bus 7
23 | A1 | Address Bus 1
24 | A8 | Address Bus 8
25 | /FC0 | Processor Function Code Status (bit 0)
26 | A9 | Address Bus 9
27 | /FC1 | Processor Function Code Status (bit 1)
28 | A10 | Address Bus 10
29 | /FC2 | Processor Function Code Status (bit 2)
30 | A11 | Address Bus 11
31 | GND | Ground
32 | A12 | Address Bus 12
33 | A13 | Address Bus 13
34 | /IPL0 | Interrupt Priority Level (bit 0)
35 | A14 | Address Bus 14
36 | /IPL1 | Interrupt Priority Level (bit 1)
37 | A15 | Address Bus 15
38 | /IPL2 | Interrupt Priority Level (bit 2)
39 | A16 | Address Bus 16
40 | /BERR | Bus Error
41 | A17 | Address Bus 17
42 | /VPA | Valid Peripheral Address (asserted by Gary)
43 | GND | Ground
44 | E | E Clock
45 | /VMA | Valid Memory Address (asserted by Gary)
46 | A18 | Address Bus 18
47 | /RST | Reset
48 | A19 | Address Bus 19
49 | /HLT | Halt
50 | A20 | Address Bus 20
51 | A22 | Address Bus 22
52 | A21 | Address Bus 21
53 | A23 | Address Bus 23
54 | /BR | Bus Request
55 | GND | Ground
56 | /BGACK | Bus Grant Acknowledge
57 | D15 | Data Bus 15
58 | /BG | Bus Grant
59 | D14 | Data Bus 14
60 | /DTACK | Data Transfer Acknowledge (normally asserted by Gary)
61 | D13 | Data Bus 13
62 | R/W | Read/Write (high=read, low=write)
63 | D12 | Data Bus 12
64 | /LDS | Lower Data Strobe
65 | D11 | Data Bus 11
66 | /UDS | Upper Data Strobe
67 | GND | Ground
68 | /AS | Address Strobe
69 | D0 | Data Bus 0
70 | D10 | Data Bus 10
71 | D1 | Data Bus 1
72 | D9 | Data Bus 9
73 | D2 | Data Bus 2
74 | D8 | Data Bus 8
75 | D3 | Data Bus 3
76 | D7 | Data Bus 7
77 | D4 | Data Bus 4
78 | D6 | Data Bus 6
79 | GND | Ground
80 | D5 | Data Bus 5