Parker Brothers Electronic Mastermind

Chip labeled 
TMS 1000 NLL
MP 3200 7844

die labeled
1000E MP3200

4x6 keypad
5 red LEDs, 5 green LEDs


TMS1000 pinout
1  R8   - green LED 3
2  R9   - green LED 4
3  R10  - green LED 5 (right)
4  VDD  - batt -
5  K1   - keypad column 1 (left)
6  K2   - keypad column 2
7  K4   - keypad column 3
8  K8   - keypad column 4 (right)
9  INIT - diode and cap
10 O7   - N/C
11 O6   - N/C
12 O5   - keypad row 1 (bottom)
13 O4   - keypad row 2
14 O3   - keypad row 3
15 O2   - keypad row 4
16 O1   - keypad row 5
17 O0   - keypad row 6 (top)
18 OSC1 - OSC2 and 47pF cap to VSS, 56K resistor to VDD
19 OSC2 - OSC1
20 VSS  - batt + via switch
21 R0   - N/C
22 R1   - red LED 1 (left)
23 R2   - red LED 2
24 R3   - red LED 3
25 R4   - red LED 4
26 R5   - red LED 5 (right)
27 R6   - green LED 1 (left)
28 R7   - green LED 2


button matrix
        K1         K2         K3         K4
O0       1          2          3          4
O1       A          B          C          D
O2      A1         A2         B1         B2
O3      A3         A4         C1         C2
O4      A5         A6         D1         Del 
O5  Batt Test     Code       Check