| 1234567891011121314151617181920212223242526272829303132 |
- ;;;
- ; print_string
- ; ------------
- ; Print a string from memory.
- ;
- ; Parameters:
- ; - bx: pointer to string
- ;
- ; Internal Variables:
- ; - ah: scrolling teletype BIOS routine code
- ; - al: Byte containing character to print
- ; - bx: shifting pointer to string
- print_string:
- pusha ; save the state of all registers to the stack
- mov ah, 0x0e ; scrolling teletype BIOS routine code
- print_string_start:
- mov al, [bx] ; load first letter into `al'
- cmp al, 0
- je print_string_end ; if null-termination then return
- int 0x10 ; print the letter
- add bx, 0x1 ; offset to next character
- jmp print_string_start ; go back to beginning
- print_string_end:
- mov al, 0xA
- int 0x10
- mov al, 0xD
- int 0x10
- popa ; return the state of all the registers
- ret
|
