Table of Contents

Keyboard details

(Again, someone should please verify this and double check my work.)

Row/Column to Port translation

The keypad matrix row and column lines are connected to PIOC lines (port C, general purpose I/O).

The ON key is tied to PC10 and FWUP. it is not part of the matrix.

Port pinKeypad connection
PC0 Keypad column 0
PC1 Keypad column 1
PC2 Keypad column 2
PC3 Keypad column 3
PC4 Keypad column 4
PC5 Keypad column 5
PC6 Keypad column 6
PC11 Keypad row 0
PC12 Keypad row 1
PC13 Keypad row 2
PC14 Keypad row 3
PC15 Keypad row 4
PC26 Keypad row 5

Key to Row/Column translation

Row 0 Row 1 Row 2 Row 3 Row 4 Row 5
Column 0 N I/YR PV PMT FV Amort
Column 1 CshFl IRR NPV Bond % RCL
Column 2 Input ( ) +/- Backspace
Column 3 Up 7 8 9 Divide
Column 4 Down 4 5 6 X
Column 5 Shift 1 2 3 -
Column 6 0 . = +