[BITS 16]
;;; Call BIOS to populate equipment bitv in the HARDWARE buffer.
GET_EQUIPMENT_LIST:
        xor ax, ax
        int 0x11
        mov [wEquipmentBitvector], ax
        ret

;;; Call BIOS to get the system memory size.
GET_MEMORY_SIZE:
        xor ax, ax
        mov ah, 0x88
        int 0x15
        add ax, 1024
        mov [wMemorySize], ax
        ret
        
GET_TIME:
        xor ax, ax
        int 0x1a
        push es
        push si
        mov es, cx
        mov si, dx
        mov cx, WORD [es:si]
        mov [wSystemClock], cx
        pop si
        pop es
        ret

; Enable the A20 address line, so we can correctly address
; memory above 1MB.
ENABLE_A20:     
        mov	al, 0xD1
        out	0x64, al
        nop
        jmp .here
.here:  mov	al, 0xDF
        out	0x60, al
        nop
        jmp .there
.there: ret