KWANDA: An Interactive Display Subroutine

KWANDA is an enhanced version of the QANDA (DEC-12-FISA) subroutine designed for the PDP-12 computer. It maintains the core requirements and calling sequence of QANDA while introducing five key modifications:

• Expanded Answer Field: Supports up to 99 characters using a 2-digit octal format.
• Memory Flexibility: The subroutine no longer needs to reside in the current instruction field.
• Teletype Access: Provides I/O capabilities for the teletype from any core segment.
• Faster I/O: Utilizes recommended faster teletype I/O routines to reduce flicker on large displays.
• Control Character Support: Allows users to terminate display operations and select alternate program options via control keys during execution.

The document provides details on calling sequences, important memory addresses, and specific requirements (PDP-12A with 1000 octal core locations).