; AL = Character
BIOS_WriteTTYChar:
    ;MOV AL, [0]
    MOV AH, 0Eh
    INT 10h
    RET

BIOS_SetVideoMode13H:
    CMP BYTE [CurrentVideoMode], 0x13 ; Prevent a switch if we're already mode 13.
    ; This prevents clearing the framebuffer if clearing wasn't intended
    JE .already
    MOV AX, 0x0013
    INT 10h
    MOV BYTE [CurrentVideoMode], 0x13
    .already:
    RET

BIOS_SetVideoMode03H:
    CMP BYTE [CurrentVideoMode], 0x03 ; Prevent a switch if we're already mode 03.
    ; This prevents clearing the framebuffer if clearing wasn't intended, and also whenever
    ; we show an error in fallback mode, and then call an error handler, the latter will not
    ; clear the screen by switching from 03 to 03.
    JE .already
    MOV AX, 0x0003
    INT 10h
    MOV BYTE [CurrentVideoMode], 0x03
    .already:
    RET