Preliminary MSX support

docs/api/command-line.md

@@ -22,6 +22,7 @@ Extension will be added automatically,
 no extension for BBC micro program file,
 `.inf` for BBC Micro metadata,
 `.d88` for PC-88 disk images,
+`.rom` for MSX cartridge images,
 `.tap` for ZX-Spectrum tape images.
 
 * `-s` – Generate also the assembly output. It is not compatible with any assembler, but it serves purely informational purpose. The file has the same nam as the output file and the extension is `.asm`.

docs/api/target-platforms.md

@@ -4,7 +4,7 @@
 
 Currently, Millfork supports creating disk- or tape-based programs
 for Commodore, Apple, BBC and Atari 8-bit computers, NEC PC-88, ZX Spectrum 48k, Amstrad CPC, CP/M,
-and cartridge-based programs for Commodore 64, VIC-20, Famicom/NES and Atari 2600,
+and cartridge-based programs for Commodore 64, VIC-20, MSX, Famicom/NES and Atari 2600,
 but it may be expanded to support other 6502-based and Z80-based platforms in the future.
 
 To add a custom platform yourself, see [the custom platform adding guide](./custom-platform.md).
@@ -78,6 +78,8 @@ The compiler emits tape images.
 
 * `zxspectrum_8080` – Sinclair ZX Spectrum 48k, using only Intel 8080 instructions
 
+* `msx_crt` – MSX 16kB cartridge, using only 16kB RAM
+
 * `gb_small` – a tiny 32K Game Boy program. (experimental)
 The compiler emits GB files.
 Read [the Game Boy programming guide](./gb-programming-guide.md) for more info.