Coleco Amaze-A-Tron Chip labeled TMS1100NLL MP3405 BSP 7818 die labeled MP3405 manual: https://archive.org/details/manuals-handheld-games-Coleco-AmazeATron LED, buttons, keypad layout, TMS pin connections mostly described in patent 27 buttons: 5x5 grid, game select and game start 2 7-segment LEDs 2 LEDs: green and red speaker 1 R8 digit 2 common 2 R9 digit 1 common 3 R10 transistor to speaker 4 VDD 9v battery negative 5 K1 keypad row 5 (top row, #s 1 2 3 4 5) 6 K2 keypad row 4 (6 7 8 9 10) 7 K4 keypad row 3 (11 12 13 14 15) 8 K8 keypad row 2 (16 17 18 19 20) 9 Init N/C 10 O7 N/C 11 O6 Segment G 12 O5 Segment F 13 O4 Segment E 14 O3 Segment D 15 O2 Segment C 16 01 Segment B 17 O0 Segment A 18 Osc1 To Pin 19 and 100pF cap to VSS 19 Osc2 To Pin 18 20 VSS 9v battery positive 21 R0 keypad col 1 (1 6 11 16 21) 22 R1 keypad col 2 (2 7 12 17 22) 23 R2 keypad col 3 (3 8 13 18 23) 24 R3 keypad col 4 (4 9 14 19 24) 25 R4 keypad col 5 (5 10 15 20 25) 26 R5 game select/game start common 27 R6 Red LED 28 R7 Green LED