Typing Letters To I/O Window

This is page contains 6502 ASM source code using the 6502 MAS. It requires the 6502 MAS because it makes use of its I/O window. This is an example of how to put typed characters to the I/O window.

    .ORG $800

input:
    LDX $E004 ;see if character typed
    CPX #$00  ;if zero no character typed
    BEQ input ;go back to start
    STX $E001 ;if not zero, put it to screen
    JMP input ;go back to start