Commodore Amiga A500 Technical Reference Manual page 110

The expanded B2000 video slot is a 36 pin edge connector, the
same type as used on the 16 bit IBM style bus extension.
PIN Signal
1 Ground
3 RI
5 Ground
7 G1
9 Ground
11 B2
13 Composite Video
15 CDAC Clock
17 /C3 Clock
19 /LPEN
21 SEL
23 PDO
25 PD2
27 PD4
28 PD6
31 /LED
33 Raw Audio Left
35 Raw Audio Right
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PIN Signal
2 R0
4 R2
6 GO
8 G2
10 B1
12 Ground
14 TBASE
16 POUT
18 BUSY
20 /ACK
22 Ground
24 PD1
26 PD3
28 PD5
30 PD7
32 Ground
34 Audio Ground
36 Audio Ground