Extensions of MSX BASIC
Since MSX BASIC was meant to be expandable from inception, it was possible to write add-on modules quite easily. Support for specific hardware was commonly added by means of expansion cartridges, which also served as the interface to the hardware in question. MSX Disk-BASIC is an example, bundled in the cartridge that provides the hardware interface to the disk drives, it adds commands to access the floppy disk drives.
Exploring the MSX BASIC extensibility it was possible to extend MSX BASIC solely via software. A very interesting extension to the MSX BASIC 1.0/1.1 was Screen IV, a tweak of MSX BASIC adding the mixed graphic/text mode Screen 4 (hence its name Screen IV), with 64 x 24 characters and Screen 2 resolution for graphics (256 x 192 pixels, 16 colors).
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