Entex Space Battle

Chip labeled 
EN-6004
MP0920
MS^ 7923

die labeled
MP0920

6 buttons: F1/F2/Launch for P1 and P2
1 switch: Manual/Auto
2 7-segment LEDs
36 LEDs
Piezo buzzer


TMS1000 pinout
1  R8   - P2 7-segment LED
2  R9   - P1 7-segment LED
3  R10  - Piezo
4  VDD
5  K1   - button matrix
6  K2   - button matrix
7  K4   - button matrix
8  K8   - button matrix
9  INIT - cap
10 O7   - LED matrix
11 O6   - LED segment G / LED matrix
12 O5   - LED segment F / LED matrix
13 O4   - LED segment E / LED matrix
14 O3   - LED segment D / LED matrix
15 O2   - LED segment C / LED matrix
16 O1   - LED segment B / LED matrix
17 O0   - LED segment A / LED matrix
18 OSC1 - connected to OSC2 and 33pF disc cap (to VSS) and 47K resistor (to VDD)
19 OSC2 - OSC1
20 VSS
21 R0   - LED matrix / button matrix
22 R1   - LED matrix / button matrix
23 R2   - LED matrix
24 R3   - LED matrix
25 R4   - LED matrix
26 R5   - LED matrix
27 R6   - LED matrix
28 R7   - LED matrix


button matrix
        K1          K2           K4          K8
      ------------------------------------------
R0    P2 F1       P2 F2       P2 Launch      --
R1    P1 F1       P1 F2       P1 Launch     Auto

                            
LED Matrix

     O0  O1  O2  O3  O4  O5  O6  O7
     ------------------------------
R0   01  02  03  04  05  06  07  08
R1   09  10  11  12  13  14  15  16
R2   17  18  19  20  --  --  --  --
R3   21  22  23  24  --  --  --  --
R4   25  26  27  --  --  --  --  --
R5   28  29  30  31  --  --  --  --
R6   32  33  34  --  --  --  --  --
R7   35  36  --  --  --  --  --  --


LED numbering

35

                    25
     1          26      21
       3
     2   5   27        22
      4
           7
        6             23
             9
          8
              11
      31   10      24
                13
             12
    30             15
               14
                     17
  29        34   16
                       19
        33          18
28                      20
     32
     
                            36