| Signal | Connected To | Notes | |
| Q1201-E | Connected to P1201-2 | ||
| Q1201-E | Connected to P1201-1 | ||
| Ground | |||
| Ground | |||
| A2 | U1207-10 | Keys 3,6,9,C,F | |
| A1 | U1207-12 | Keys 2,5,8,B,E | |
| A0 | U1207-14 | Keys 0,1,4,7,A,D | |
| R1201 | |||
| Not Connected | |||
| Reset | RESET-SWITCH | P1201-11 | |
| Reset | RESET-SWITCH | P1201-10 | |
| Ground | |||
| +5V | |||
| Not Connected | |||
| D4 | U1209-13 | Keys 1,2,3 | |
| D3 | U1209-11 | Keys 4,5,6 | |
| D2 | U1209-9 | Keys 7,8,9 | |
| D5 | U1209-3 | Key 0 | |
| D1 | U1209-5 | Keys A.B.C | |
| D0 | U1209-7 | Keys D,E,F | |
| D0-Not | |||
| A5 | U1208-14 | ||
| A6 | U1208-13 | ||
| U1208-12 | |||
| A4 | U1208-15 |
Copyright © 1992 Donnie V. Savage
All Rights Reserved.