http://www.mentasm.com/~mramiga/files/tech/tech/86pinbus.htm (Amiga Plus Extra No. 5, 08/1997)Amiga 500/1000 86 PIN Expansion Bus
| Pin | Function | Pin | Function | Pin | Function | Pin | Function | Pin | Function |
| 1 GND | 19 /EINT2 | 37 DGND | 55 /HLT | 74 DGND |
| 2 GND | 20 /PALOPE | 38 A12 | 56 A20 | 75 /A5 |
| 3 GND | 21 A5 | 39 A13 | 57 A22 | 76 PD10 |
| 4 GND | 22 /EINT6 | 40 /IPL0 | 58 A21 | 77 PD1 |
| 5 +5v | 23 A6 | 41 A14 | 59 A22 | 78 PD9 |
| 6 -5V | 24 A4 | 42 /IPL1 | 60 /BR | 79 PD2 |
| 7 N.C. | 25 DGND | 43 A15 | 61 DGND | 80 PD8 |
| 8 -5V | 26 A3 | 44 /IPL2 | 62 /BGACK | 81 PD3 |
| 9 N.C | 27 A2 | 45 A16 | 63 PD15 | 82 PD7 |
| 10 +12V | 28 A7 | 46 /BERR | 64 /BG | 83 PD4 |
| 11 N.C. | 29 A1 | 47 /A17 | 65 PD14 | 84 PD6 |
| 12 /CONFIG | 30 A8 | 48 /VPA | 66 /DTACK | 85 DGND |
| 13 DGND | 31 FC0 | 49 BGND | 68 /PRW | 86 PD5 |
| 14 /C3 | 32 A9 | 50 E | 69 /PD12 | |
| 15 CDAC | 33 A9 | 51 /VMA | 70 /LDS | |
| 16 /C1 | 34 A10 | 52 A18 | 71 PD11 | |
| 17 /OVR | 35 FC2 | 53 /RES | 72 /UDS | |
| 18 XRDY | 36 A11 | 54 A19 | 73 DGND |
Diference between A2000 and A1000 CPU slot and A1000 expansion bus
Pin 9 28MHZ Pin 20 N.C.