Keyword Entry

Loads two machine code blocks, START and MAIN, that change keyword entry so that every keyword is typed out in full, letter by letter, instead of being entered with a single key in K mode. The loader runs START with RANDOMIZE USR 23300, loads MAIN, then lists itself with a flashing “hit enter” prompt. Its REM says lines 1 to 3 can be deleted once it has run.

This program is on side B of the Long Island Sinclair Timex (LIST) user group library tape #3.5, saved as KEYWORD68 followed by its CODE files START (51 bytes) and MAIN (224 bytes).

Program Analysis

Program Structure

Line 1 is the explanatory REM. Line 2 loads START, calls it at 23300 and loads MAIN. Line 3 clears the screen and lists the program. Nothing in the BASIC shows how the code works.

    1 REM ---  KEYWORD ENTRY ---      YOU MUST NOW ENTER ALL KEY      WORDS BY TYPING THEM IN         FULL       
    2 LOAD "START"CODE :              RANDOMIZE USR 23300:            LOAD "MAIN"CODE 
    3 CLS : BORDER 1: LIST :          PRINT AT 20,1; INK 2;           FLASH 1;"hit enter": STOP   :   REM YOU MAY DELETE LINES        1 TO 3 NOW.