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IBM SCSI External Connectors & Cables
Internal 50-pin Card-Edge Connector
Internal 50-pin Header Connector
External 60-pin Connector
Internal/External 68-pin Connector
External 50-pin Connector
Sources
Internal 50-pin Card-Edge Connector
Used on most IBM SCSI adapters to connect internal devices (narrow; 8-bit).
| Pin | Signal | Pin | Signal |
|---|
| 1 | Ground | 2 | -Data 0 |
| 3 | Ground | 4 | -Data 1 |
| 5 | Ground | 6 | -Data 2 |
| 7 | Ground | 8 | -Data 3 |
| 9 | Ground | 10 | -Data 4 |
| 11 | Ground | 12 | -Data 5 |
| 13 | Ground | 14 | -Data 6 |
| 15 | Ground | 16 | -Data 7 |
| 17 | Ground | 18 | -Data Parity |
| 19 | Ground | 20 | Ground |
| 21 | Ground | 22 | Ground |
| 23 | Ground | 24 | Ground |
| 25 | Not Connected | 26 | +Terminal Power |
|
| 27 | Ground | 28 | Ground |
| 29 | Ground | 30 | Ground |
| 31 | Ground | 32 | -Attention |
| 33 | Ground | 34 | Ground |
| 35 | Ground | 36 | -Busy |
| 37 | Ground | 38 | -Acknowledge |
| 39 | Ground | 40 | -Reset |
| 41 | Ground | 42 | -Message |
| 43 | Ground | 44 | -Select |
| 45 | Ground | 46 | -Control/Data |
| 47 | Ground | 48 | -Request |
| 49 | Ground | 50 | -Input/Output |
Pin 1 is located on the solder side of the PCB, closer to the rear metal bracket.
There is a physical key between pins 25 and 27 (26 and 28).
On the "Tribble" PCB the odd pins 1-49 are marked as BB01-BB25 (solder side) and even pins 2-50 as AA01-AA25 (component side).
Internal 50-pin Header Connector
This is the "industry standard" internal SCSI connector (narrow; 8-bit).
It's used by all planar SCSI implementations and also by the following
adapters:
| Pin | Signal | Pin | Signal |
|---|
| 1 | Ground | 2 | -Data 0 |
| 3 | Ground | 4 | -Data 1 |
| 5 | Ground | 6 | -Data 2 |
| 7 | Ground | 8 | -Data 3 |
| 9 | Ground | 10 | -Data 4 |
| 11 | Ground | 12 | -Data 5 |
| 13 | Ground | 14 | -Data 6 |
| 15 | Ground | 16 | -Data 7 |
| 17 | Ground | 18 | -Data Parity |
| 19 | Ground | 20 | Ground |
| 21 | Ground | 22 | Ground |
| 23 | Ground | 24 | Ground |
| 25 | Not Connected | 26 | +Terminal power |
| 27 | Ground | 28 | Ground |
| 29 | Ground | 30 | Ground |
| 31 | Ground | 32 | -Attention |
| 33 | Ground | 34 | Ground |
| 35 | Ground | 36 | -Busy |
| 37 | Ground | 38 | -Acknowledge |
| 39 | Ground | 40 | -Reset |
| 41 | Ground | 42 | -Message |
| 43 | Ground | 44 | -Select |
| 45 | Ground | 46 | -Control/Data |
| 47 | Ground | 48 | -Request |
| 49 | Ground | 50 | -Input/Output |
External 60-pin Connector
This is the 60-pin Mini Centronics connector used on most narrow IBM SCSI
adapters to connect external devices.
| Pin | Signal | Pin | Signal |
|---|
| 1 | Ground | 31 | Ground |
| 2 | -Data 0 | 32 | -Attention |
| 3 | Ground | 33 | Ground |
| 4 | -Data 1 | 34 | Ground |
| 5 | Ground | 35 | Ground |
| 6 | -Data 2 | 36 | -Busy |
| 7 | Ground | 37 | Ground |
| 8 | -Data 3 | 38 | -Acknowledge |
| 9 | Ground | 39 | Ground |
| 10 | -Data 4 | 40 | -Reset |
| 11 | Ground | 41 | Ground |
| 12 | -Data 5 | 42 | -Message |
| 13 | Ground | 43 | Ground |
| 14 | -Data 6 | 44 | -Select |
| 15 | Ground | 45 | Ground |
| 16 | -Data 7 | 46 | -Control/Data |
| 17 | Ground | 47 | Ground |
| 18 | -Data Parity | 48 | -Request |
| 19 | Ground | 49 | Ground |
| 20 | Ground | 50 | -Input/Output |
| 21 | Ground | 51 | Ground |
| 22 | Ground | 52 | Reserved / Ground** |
| 23 | Ground | 53 | Reserved / Ground** |
| 24 | Ground | 54 | Reserved / Ground** |
| 25 | Not Connected | 55 | Reserved / Ground** |
| 26 | +Terminal Power (+5 V fused) | 56 | Reserved / Ground** |
| 27 | Ground | 57 | Reserved / Ground** |
| 28 | Ground | 58 | Reserved / Ground* / Ground** |
| 29 | Ground | 59 | Reserved / 8032 RXD* / Ground** |
| 30 | Ground | 60 | Reserved / 8032 TXD* / Ground** |
Notes:
* Applies to uncached SCSI/A adapters
** Applies to SCSI w/ cache adapters
Pin 59 and 60 are used to access the Serial
Console on the uncached adapters.
Internal/External 68-pin Connector
This is the 68-pin Mini Centronics connector used on most fast/wide IBM SCSI
adapters to connect internal and external devices (the two variants use similar
connectors but the internal one lacks the metal shielding).
| Pin | Signal | Pin | Signal |
|---|
| 1 | Ground | 35 | -Data 12 |
| 2 | Ground | 36 | -Data 13 |
| 3 | Ground | 37 | -Data 14 |
| 4 | Ground | 38 | -Data 15 |
| 5 | Ground | 39 | -Data Parity 1 |
| 6 | Ground | 40 | -Data 0 |
| 7 | Ground | 41 | -Data 1 |
| 8 | Ground | 42 | -Data 2 |
| 9 | Ground | 43 | -Data 3 |
| 10 | Ground | 44 | -Data 4 |
| 11 | Ground | 45 | -Data 5 |
| 12 | Ground | 46 | -Data 6 |
| 13 | Ground | 47 | -Data 7 |
| 14 | Ground | 48 | -Data Parity 0 |
| 15 | Ground | 49 | Ground |
| 16 | Ground | 50 | Ground |
| 17 | +Terminal power | 51 | +Terminal power |
| 18 | +Terminal power | 52 | +Terminal power |
| 19 | Reserved | 53 | Reserved |
| 20 | Ground | 54 | Ground |
| 21 | Ground | 55 | -Attention |
| 22 | Ground | 56 | Ground |
| 23 | Ground | 57 | -Busy |
| 24 | Ground | 58 | -Acknowledge |
| 25 | Ground | 59 | -Reset |
| 26 | Ground | 60 | -Message |
| 27 | Ground | 61 | -Select |
| 28 | Ground | 62 | -Control/Data |
| 29 | Ground | 63 | -Request |
| 30 | Ground | 64 | -Input/Output |
| 31 | Ground | 65 | -Data 8 |
| 32 | Ground | 66 | -Data 9 |
| 33 | Ground | 67 | -Data 10 |
| 34 | Ground | 68 | -Data 11 |
External 50-pin Connector
This is the "industry standard" HPDB50 external SCSI connector (narrow;
8-bit). It's used by a very few IBM SCSI adapters:
| Pin | Signal | Pin | Signal |
|---|
| 1 | Ground | 26 | -Data 0 |
| 2 | Ground | 27 | -Data 1 |
| 3 | Ground | 28 | -Data 2 |
| 4 | Ground | 29 | -Data 3 |
| 5 | Ground | 30 | -Data 4 |
| 6 | Ground | 31 | -Data 5 |
| 7 | Ground | 32 | -Data 6 |
| 8 | Ground | 33 | -Data 7 |
| 9 | Ground | 34 | -Data Parity |
| 10 | Ground | 35 | Ground |
| 11 | Ground | 36 | Ground |
| 12 | Reserved | 37 | Reserved |
| 13 | Not Connected | 38 | +Terminal power |
| 14 | Reserved | 39 | Reserved |
| 15 | Ground | 40 | Ground |
| 16 | Ground | 41 | -Attention |
| 17 | Ground | 42 | Ground |
| 18 | Ground | 43 | -Busy |
| 19 | Ground | 44 | -Acknowledge |
| 20 | Ground | 45 | -Reset |
| 21 | Ground | 46 | -Message |
| 22 | Ground | 47 | -Select |
| 23 | Ground | 48 | -Control/Data |
| 24 | Ground | 49 | -Request |
| 25 | Ground | 50 | -Input/Output |
Sources
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