Start on box drawer

Author: commonkestrel

examples/box.asm

@@ -0,0 +1,38 @@
+@define SCREEN_WIDTH 80
+@define SCREEN_HEIGHT 25
+@define BOX_WIDTH (SCREEN_WIDTH - 2)
+@define BOX_HEIGHT (SCREEN_HEIGHT - 2)
+
+@define TR_CORNER 0xBB 
+@define BR_CORNER 0xBC
+@define BL_CORNER 0xC8
+@define TL_CORNER 0xC9
+@define WALL 0xBA
+@define DASH 0xCD
+
+jmp [_start]
+
+/// math = ./math
+@include <math/mul.asm>
+
+_start:
+    call [draw_top]
+    call [draw_bottom]
+    call [draw_left]
+    call [draw_right]
+    halt
+
+draw_top:
+    mv A, 1
+
+
+    ret
+
+draw_bottom:
+    ret
+
+draw_left:
+    ret
+
+draw_right:
+    ret