Library feature coverage per platform

The following table shows which library features are implemented for which target platform as of version 0.3.4.

Legend:

✔️ – implemented
⚠️ – implemented, but only partially correctly
⭐️ – implemented, but only conditionally correctly
➖ – no hardware capabilities, or operation is hardware-dependent
❌ – not implemented

6502 computers

feature	C64	C16/Plus4	C128	VIC20	PET	Atari	Apple 2	BBC Micro
putchar	✔️	✔️	✔️	✔️	⚠️1	✔️	✔️	✔️
readkey	✔️	✔️	✔️	✔️	✔️	✔️	✔️	❌
readline	✔️2	✔️2	❌	✔️	❌	❌	✔️	❌
bell	❌	❌	❌	❌	❌	❌	✔️	❌
set_bg_color	✔️	✔️	✔️	✔️	➖	❌	❌	❌
set_border	✔️	✔️	✔️	✔️	➖	❌	➖	➖
hardware randomness	✔️3	❌	✔️3	❌	❌	✔️4	❌	❌
joystick support	✔️	❌	✔️	❌	❌	❌	❌	❌

Notes:

1. Doesn't clear quotation mode after printing a double quote character.

2. Requires BASIC ROM.

3. Uses the SID chip.

4. Uses the POKEY chip.

8080/Z80/6809 computers

feature	ZX Spectrum	PC-88	CPC	MSX	TRS-80	Tandy CoCo	Z1013	CP/M
putchar	✔️	✔️	✔️	✔️	✔️	✔️	✔️	✔️
readkey	✔️	✔️	✔️	❌	✔️	✔️	✔️	❌
readline	✔️	✔️	✔️	✔️	✔️	❌	✔️	✔️
bell	✔️	❌	❌	❌	❌	❌	➖	➖
set_bg_color	❌	❌	❌	❌	➖	➖	➖	➖
set_border	✔️	➖	❌	❌	➖	❌	➖	➖
hardware randomness	✔️	✔️	✔️	✔️	✔️	❌	✔️	⭐️1
joystick support	❌	❌	❌	❌	❌	❌	❌	➖

Notes:

1. Hardware randomness works if using the cpm_z80 target, as it requires a Z80 CPU.

Consoles

feature	NES	Game Boy	Atari 2600	Atari Lynx
putchar	❌	❌	❌	❌
readkey	❌	➖	❌	➖
readline	❌	➖	❌	➖
bell	❌	❌	❌	❌
set_bg_color	❌	❌	❌	❌
set_border	➖	➖	➖	➖
hardware randomness	❌	❌	❌	❌
joystick support	✔️	✔️	❌	✔️