Radio Shack Pocket Repeat Model 60-2152

Chip labeled 
MP1801-N2LL
DS8505
PHILIPPINES

die labeled
MP1801

4 buttons: Yellow, Blue, Orange, Red
4 LEDs
Piezo buzzer


1  R8   - N/C
2  R9   - N/C
3  R10  - N/C
4  VDD  - batt - via switch
5  K1   - yellow button (beginner/game 1)
6  K2   - blue button (amateur/game 2)
7  K4   - orange button (expert/last)
8  K8   - red button (champ/again)
9  INIT - cap/diode
10 O7   - N/C
11 O6   - Piezo and 1K resistor to VDD
12 O5   - Piezo and 1K resistor to VDD
13 O4   - N/C
14 O3   - N/C
15 O2   - N/C
16 O1   - N/C
17 O0   - N/C
18 OSC1 - OSC2 and 47 cap to VSS, 100K resistor to VDD
19 OSC2 - OSC1 and cap and resistor
20 VSS  - batt +
21 R0   - yellow LED
22 R1   - blue LED
23 R2   - orange LED
24 R3   - red LED
25 R4   - N/C
26 R5   - N/C
27 R6   - N/C
28 R7   - N/C


button matrix
           K1              K2             K4             K8
VSS   yellow button    blue button   orange button   red button