TI-55-II 40 SDIP Chip labeled TP0456N2L CD4556 M^8310 die labeled 0456-56 28 SDIP Chip labeled TP0456NL CD4555 M^8340 die labeled 0456-55 45 buttons 10-digit, 84-segment LCD -MMMMMMMM-EE Buttons Pin 2 Pin 5 Pin 8 Pin 13 Pin 16 batt + 2nd R/S SQRT OFF ON/C Pin 15 LRN RST SST BST Integral Pin 3 hyp sin cos tan DRG Pin 4 INV EE log lnx y^x Pin 7 SUM+ x<>y ( ) / Pin 6 STO 7 8 9 X Pin 14 RCL 4 5 6 - Pin 10 EXC 1 2 3 + Pin 9 Pi 0 . +/- = 0456-56 1 NC 2 KP column 1 and pin 38 3 KP row 7 and LCD segments and 0456-55 pin 26 4 KP row 6 and LCD segments and 0456-55 pin 28 5 KP column 2 6 KP row 4 and LCD segments and 0456-55 pin 10 7 KP row 5 and LCD segments 8 KP column 3 9 KP row 1 and LCD segments 10 KP row 2 and LCD segments 11 0456-55 pin 7 12 0456-55 pin 5 13 KP column 4 14 KP row 3 and LCD segments and 0456-55 pin 3 15 KP row 8 and LCD segments and 0456-55 pin 1 16 KP column 5 and 0456-55 pin 10 17 batt - 18 batt + 19 LCD common 4 20 LCD common 3 21 LCD segments 22 LCD segments 23 LCD segments and 0456-55 pin 19 24 LCD segments and 0456-55 pin 18 25 LCD segments and 0456-55 pin 17 26 LCD segments and 0456-55 pin 16 27 LCD segments 28 LCD segments 29 LCD segments 30 LCD segments 31 LCD segments 32 LCD segments 33 LCD segments 34 LCD segments 35 LCD segments 36 LCD segments 37 LCD segments 38 LCD segments 39 LCD common 2 40 LCD common 1 0456-55 1 pin 9 and 0456-56 pin 15 2 NC 3 pin 8 and 0456-56 pin 14 4 NC 5 0456-56 pin 12 6 NC 7 0456-56 pin 11 8 pin 3 9 pin 1 10 0456-56 pin 6 11 NC 12 batt - 13 batt + 14 NC 15 NC 16 0456-56 pin 26 17 0456-56 pin 25 18 0456-56 pin 24 19 0456-56 pin 23 20 NC 21 NC 22 NC 23 NC 24 NC 25 NC 26 0456-56 pin 3 27 NC 28 0456-56 pin 4 84 LCD segments MS M8 M7 M6 M5 M4 M3 M2 M1 ES E2 E1 - - - - - - - - - - | | | | | | | | | | | | | | | | | | | | - - - - - - - - - - - - | | | | | | | | | | | | | | | | | | | | - . - . - . _ . - . - . - . - - - STAT DEG RAD GRAD PROG LCD signals pin 40 pin 39 pin 20 pin 19 37 STAT DEG GRAD RAD 36 MS M8E M8F M8G 35 M8D M8C M8A M8B 34 M8DP M7E M7F M7G 33 M7D M7C M7A M7B 32 M7DP M6E M6F M6G 31 M6D M6C M6A M6B 30 M6DP M5C M5F M5G 29 M5D M5E M5A M5B 28 M5DP M4C M4F M4G 27 M4D M4E M4A M4B 22 M4DP M3C M3F M3G 21 M3D M3E M3A M3B 3 M3DP M2C M2F M2G 4 M2D M2E M2A M2B 6 M2DP M1C M1F M1G 7 M1D M1E M1A M1G 9 ES E2E E2F E2G 10 E2D E2C E2A E2B 14 PROG E1E E1F E1G 15 E1D E1C E1A E1B