Author: Anders Carlsson <anders.carlsson@sfks.se>
System: MSX1
Language: MSX BASIC 1.0 (Microsoft Extended)
Source code ASCII: 121 characters
Executable size: 138 bytes (CAS file)
Size after loading: 98 bytes
Size after execution: 161 bytes

How to run:

1. Start a MSX emulator like RuMSX, BlueMSX
2. Mount the CAS file as a tape, make sure to rewind it in the emulator
3. Load the file with CLOAD
4. RUN

The program repeats each pattern twice, and utilizes the MOD operator to
determine which line to draw.

Executable size is calculated with FRE(0) before and after loading the program.