Mario's Cement Factory ML102 60 QFP Chip labeled ML-102 298D Nintendo die labeled CMS54C KMS577 8 buttons 132 LCD segments piezo Sharp SM510 1 T VDD 2 K1 Time button / Open button 3 K2 Game B button / Right button 4 K3 Game A button / Left button 5 K4 Alarm button 6 ACL ACL button 7 BA N/C 8 Gnd batt+ 9 Osc Out crystal 10 Osc In crystal 11 VDD batt - 12 beta N/C 13 R1 piezo 14 R2 N/C 15 bs 16 b16 17 a16 18 b15 19 a15 20 b14 21 a14 22 b13 23 a13 24 b12 25 a12 26 b11 27 a11 28 b10 29 a10 30 b9 31 a9 32 b8 33 a8 34 b7 35 a7 36 b6 37 a6 38 N/C 39 b5 40 a5 41 b4 42 a4 43 b3 44 a3 45 b2 46 a2 47 b1 48 a1 49 H4 50 H3 51 H2 52 H1 53 S1 Open / Left / Right buttons 54 S2 Game A / Game B / Time / Alarm buttons 55 S3 N/C 56 S4 N/C 57 S5 N/C 58 S6 N/C 59 S7 N/C 60 S8 N/C Buttons K1 K2 K3 K4 S1 Open Left Right -- S2 Time Game B Game A Alarm