I attempted to reverse-engineer the bus, but i stopped short of the processor bus.
Video Deflection
| Solder Side | Component Side |
| Gnd | Gnd |
| 5V | 5V |
| 12V | 12V |
| -12V | -12V |
| -5V | -5V |
| +26V | +26V |
| Write | Write |
| Write | Write |
| Horizontal | Horizontal |
| Horizontal | Horizontal |
| Vertical | Vertical |
| Vertical | Vertical |
| Heater | Heater |
| Heater | Heater |
| Cathode | Cathode |
| Grid 1 | Grid 1 |
| Grid 7 | Grid 7 |
| Grid 2 | Grid 2 |
| +26V xxx | +26V xxx |
| +400V | +400V |
| +68V | +68V |
| 5V | 5V |
| Gnd | Gnd |
Power Supply (pretty sure there are a few errors here!)
| Solder Side | Component Side |
| Gnd | Gnd |
| +5V | +5V |
| +12V | +12V |
| -12V | -12V |
| -5V | -5V |
| 26V | 26V |
| 9VAC | 9VAC |
| 9VAC | 9VAC |
| 9VAC_Ret | 9VAC_Ret |
| 9VAC_Ret | 9VAC_Ret |
| 16VAC | 16VAC |
| 16VAC_Ret | 16VAC_Ret |
| Gnd | Gnd |
| Gnd | Gnd |
| Gnd | Gnd |
| 26VAC | 26VAC |
| 26VAC_Ret | 26VAC_Ret |
| 13VAC | 13VAC |
| 13VAC_Ret | 13VAC_Ret |
| +5V | +5V |
| +5V | +5V |
| Gnd | Gnd |
Microbus
| Solder Side | Component Side |
| Gnd | Gnd |
| +5V | +5V |
| +12V | +12V |
| -12V | -12V |
| -5V | -5V |
| 26V | 26V |
| +26V | +26V |
| -5V | -5V |
| -12V | -12V |
| +12V | +12V |
| +5V | +5V |
| Gnd | Gnd |