Mego Fabulous Fred

Chip labeled 
NEC K01059
TTGR-511

die labeled
NEC D557 511

15 buttons: 1-9, Start, Select, Hit, Repeat, Rest, 1/8 Note
9 lamps
speaker


D557 pinout
1  CL1  - tunable inductor
2  PC0  - buttons 1, 2, 3, 4
3  PC1  - buttons 5, 6, 7, 8
4  PC2  - buttons 9, Rest, 1/8 Note
5  PC3  - n/c
6  PD0  - Lamp 1
7  PD1  - Lamp 2
8  PD2  - Lamp 3
9  PD3  - Lamp 4
10 PE0  - Lamp 9
11 PE1  - speaker
12 PE2  - N/C
13 PE3  - buttons Repeat, Select, Hit
14 VSS  - 9v+
15 TEST - VSS
16 PF0  - Lamp 5
17 PF1  - Lamp 6
18 PF2  - Lamp 7
19 PF3  - Lamp 8
20 PG0  - N/C
21 PA0  - buttons Select, 1, 5, 9
22 PA1  - buttons Rest, 2, 6
23 PA2  - buttons 1/8 Note, Hit, 3, 7
24 PA3  - buttons Repeat, 4, 8
25 /INT - start button (other side to VGG)
26 RES  - diode and resistor
27 VGG  - 9v- via switch
28 CL0  - tunable inductor


button matrix
         PA0     PA1    PA2     PA3
PC0       1       2      3       4
PC1       5       6      7       8
PC2       9     Rest  1/8 Note   -
PE3    Select     -     Hit    Repeat


         VGG
/INT   Start