ZeusWPI/ass_messages
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inline read_duration function

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This commit is contained in:
Tibo Ulens 2021-10-08 13:58:38 +02:00
parent f42ac8bafd
commit 4b385cf8f0
1 changed files with 18 additions and 11 deletions
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29
messages.asm
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@ -158,9 +158,16 @@ newline:
;; - bx ;; - bx
;; - cx ;; - cx
beep: beep:
call read_duration ; get duration from keyboard (in al) ;; Read duration (0-16 supported)
mov ah, 0x00 ; read keypress
int 0x16
;; Read ASCII character is in al
sub al, 'a' ; normalise (a=0, b=1, c=...)
;; interrupt 0x16, ah=0 returns the read scancode in ah
;; so ah must be reset
mov ah, 0 mov ah, 0
push ax ; store on stack push ax ; store on stack
;; move 182 (0b10 11 011 0) into al ;; move 182 (0b10 11 011 0) into al
;; bit 7-6 = channel select (2, PC speaker) ;; bit 7-6 = channel select (2, PC speaker)
@ -299,15 +306,15 @@ readbyte:
;; ;;
;; CLOBBERS ;; CLOBBERS
;; - ax ;; - ax
read_duration: ;read_duration:
;; Read duration (0-16 supported) ; ;; Read duration (0-16 supported)
mov ah, 0x00 ; read keypress ; mov ah, 0x00 ; read keypress
int 0x16 ; int 0x16
;
;; Read character is in al ; ;; Read character is in al
sub al, 'a' ; normalise ; sub al, 'a' ; normalise
;
ret ; ret
;; Variable to store color mode information for writing to the screen ;; Variable to store color mode information for writing to the screen
color_mode: db 0x02 color_mode: db 0x02