An entry for the
 Vintage Computing Christmas Challenge 2021

Author:             Geir Straume
System:             Commodore Plus/4
Language:           6502 (DASM Assembler)
Source code length: 2414 bytes
Executable length:  51 bytes
Actual code length: 37+2 bytes (*)
How to run:         Install VICE, start the
                    'xplus4' emulator and
                    drag and drop the prg
                    file into it.

(*) The code depends on two of the bytes in
the BASIC stub.