LV1/1b DTMF Generator Box for the Uplink System
// Hey Glenn, here's the pics, go nuts.
- Top view of the DTMF generator box:
- Inside top view of the DTMF generator:
The battery is opened/removed. The CPU crystal is non-specific OEM.
- View of the red mod wires on the back of the board:
This allows the EPROM to be a 27256. Notice cut traces. 
- View of the blue mod wires on the back of the board:
This provides the DTMF tone signal on T and R as previous, and relay contact closure on T1 and R1. Notice cut traces. 