Stub serial

messages.asm

@@ -21,6 +21,9 @@ mov dh, HEIGHT
 mov dl, WIDTH
 int 0x10
 
+;; Turn on interrupts
+sti
+
 ;; Set cursor to bottom of screen
 mov dh, HEIGHT
 mov dl, 0x00
@@ -28,10 +31,33 @@ mov bh, 0x00
 mov ah, 0x02
 int 0x10
 
+;; Start serial connection
+mov ah, 0
+mov al, 0b11100011
+mov dx, 0
+int 0x14
+
 .loop:
-        ;; Read character
-        mov ah, 0x00
-        int 0x16
+        ;; Print a '.' to debug
+        mov ah, 0x01
+        mov al, '.'
+        mov dx, 0
+        int 0x14
+
+
+        ;; Check status of COM1
+        mov ah, 0x03
+        mov dx, 0
+        int 0x14
+
+        ;; If not ok, wait
+        and ah, 0x01
+        jz .loop
+
+        ;; If ok, start reading character
+        mov ah, 0x02
+        mov dx, 0
+        int 0x14
 
         cmp al, 0x0d ; newline
         je .newline