Castle Toy Co Tactix

Chip labeled 
NEC D557LC 512
K01049

18 buttons
16 LEDs
speaker


D557L pinout
1  CL1 - tuning can
2  PC0 - button matrix column 1 (left)
3  PC1 - button matrix column 2
4  PC2 - button matrix column 3
5  PC3 - button matrix column 4
6  PD0 - LED matrix column 1 (left)
7  PD1 - LED matrix column 2
8  PD2 - LED matrix column 3
9  PD3 - LED matrix column 4
10 PE0 - button matrix column 5
11 PE1 - N/C
12 PE2 - N/C
13 PE3 - N/C
14 VSS - batt + via power switch
15 TEST - VSS
16 PF0 - LED matrix row 4
17 PF1 - LED matrix row 3
18 PF2 - LED matrix row 2
19 PF3 - LED matrix row 1 (top)
20 PG0 - speaker
21 PA0 - button matrix row 1 (top)
22 PA1 - button matrix row 2
23 PA2 - button matrix row 3
24 PA3 - button matrix row 4
25 /INT - VSS
26 RESET - diode an cap
27 VGG - batt -
28 CL0 - cap and tuning can


button matrix
     PC0 PC1 PC2 PC3
PA0   1   2   3   4
PA1   5   6   7   8
PA2   9   10  11  12
PA3   13  14  15  16

LED matrix
     PD0 PD1 PD2 PD3
PF3   1   2   3   4
PF2   5   6   7   8
PF1   9   10  11  12
PF0   13  14  15  16