This is the processor board from a Packard 500TR flow scintillation analyser. My board came from the unit in DextersTechLab's teardown video.
It's essentially an ISA-bus 386 PC on an ISA card.
Part numbers on the PCB:
Features:
The standard backup battery is a 3.6V lithium thionyl chloride cell.
Unfortunately a 3V coin cell is not suitable: the board has a very high discharge current. Three AA NiMH or alkaline cells may be a better replacement.
3-pin 0.1in-pitch header
Pins from left to right, with the RAM slots held at the left.
| 1 | 2 | 3 |
|---|---|---|
| notch |
| 1 | |
|---|---|
| 2 | MAX891 pin 11 (Watchdog In) |
| 3 | 0V |
This is likely a reset switch input.
5-pin 0.1in-pitch header
Pins from left to right, with the RAM slots held at the left.
| 1 | 2 | 3 | 4 | 5 |
|---|---|---|---|---|
| notch | ||||
| 1 | Mouse Data (82C710 pin 61) |
|---|---|
| 2 | |
| 3 | 0V |
| 4 | 5V via fuse |
| 5 | Mouse Clock (82C710 pin 60) |
10-pin IDC connector
Pins from left to right, with the RAM slots held at the left.
| 1 | 3 | 5 | 7 | 9 |
|---|---|---|---|---|
| 2 | 4 | 6 | 8 | 10 |
| notch | ||||
| 1 | Keyboard Data |
|---|---|
| 2 | Keyboard Clock |
| 3 | 0V |
| 4 | |
| 5 | 5V |
| 6 | |
| 7 | |
| 8 | |
| 9 | |
| 10 |
Mounted flat to the PCB. 8-pin (4×2) 0.1in-pitch Dupont connector.
Pins from left to right, with the RAM slots held at the left.
| PCB | |||
|---|---|---|---|
| 1 | 3 | 5 | 7 |
| 2 | 4 | 6 | 8 |
| 1 | Power LED + – via 150R to +5V |
|---|---|
| 2 | Power LED - – to 0V |
| 3 | Keylock switch 0V |
| 4 | Keylock, connect to 0V to lock – to 8042 pin 34 |
| 5 | Hard drive LED + – via 200R to +5V |
| 6 | Hard drive LED - |
| 7 | PC Speaker – via fuse to +5V |
| 8 | PC Speaker – via 33R to drive circuit |