Coleco Zodiac

Chip labeled 
TMS1100NLL
MP3435
DBS 7914
SINGAPORE

18 buttons
3-position switch H, P, A
12 LEDs
8-digit 7-segment LED
speaker


TMS1100 pinout
1  R8   - LEDs 7-12 and switch
2  R9   - LEDs 1-6
3  R10  - speaker
4  VDD  - battery - via switch
5  K1   - keypad matrix and switch position H
6  K2   - keypad matrix and switch position P
7  K4   - keypad matrix
8  K8   - keypad matrix
9  INIT - N/C
10 O7   - segment G
11 O6   - LEDs 4 and 10 and segment F
12 O5   - LEDs 3 and 9 and segment E
13 O4   - LEDs 6 and 12 and segment D
14 O3   - LEDs 2 and 8 and segment C
15 O2   - LEDs 5 and 11 and segment B
16 O1   - segment A
17 O0   - LEDs 1 and 7
18 OSC1 - 100pF disc cap to VSS, 18K resistor to VDD
19 OSC2 - OSC1
20 VSS  - battery +
21 R0   - digit 1 (right) and keypad matrix
22 R1   - digit 2 and keypad matrix
23 R2   - digit 3 and keypad matrix
24 R3   - digit 4 and keypad matrix
25 R4   - digit 5 and keypad matrix
26 R5   - digit 6
27 R6   - digit 7
28 R7   - digit 8 (left)


LED Layout

         09 08         
      10       07
   11             06
   
   12             05
      01       04
         02 03


Keypad Matrix

    K8  K4  K2  K1
    --  --  --  --
R0  0   1   2   3
R1  4   5   6   7
R2  8   9   A   D
R3  E   J   L   P
R4 CLR  -   -  ENT


O Output PLA
7E 0C B6 9E CC DA FA 0E FE CE EE BC F2 3C 70 7C
01 08 A0 A8 40 48 E0 E8 06 10 A6 B0 46 50 E6 F0