Mainframe Calculator

Purpose

This calculator is designed mainly for mainframe programmers working through memory dumps or interactive debuggers. It lets you enter a value in hex, decimal, or octal for each working row, apply plus or minus, and automatically calculate the total.

Main rows

• BASE is your starting value.
• OFFSET 1 through OFFSET 4 are additional values you can add or subtract.
• TOTAL is calculated automatically from the editable main rows.

Number entry

• Type in Hex, Decimal, or Octal; the other number fields in that row update automatically.
• Use the + / - button to control whether the row adds to or subtracts from the total.
• Notes is a free-text field for your own comments.

Alignment code

This code appears between the Hex and Notes boxes. It shows boundary alignment of the Hex value.

• D = doubleword boundary, divisible by 8.
• F = fullword boundary, divisible by 4 but not 8.
• H = halfword boundary, divisible by 2 but not 4.
• Blank = no boundary match.

SaveArea rules

• >>>>> copies whatever main row the cursor is currently in to that SaveArea row.
• <<<<< loads that SaveArea row into whatever main row the cursor is currently in.
• First click into one of the main rows so the calculator knows which row is active.

Buttons

• Instructions opens this instruction page as a modal dialog.
• Reset clears editable values back to zero, clears editable notes, restores signs to plus, and recalculates the total.

Keyboard use

• Use Tab to move through fields and buttons.
• Use Enter or Space on buttons.
• Use Esc to close the Instructions window.