updates

1 files changed, 33 insertions, 0 deletions

diff --git a/ROMs/hello_world.dat b/ROMs/hello_world.dat
new file mode 100644
index 0000000..6cdacff
--- /dev/null
+++ b/ROMs/hello_world.dat
@@ -0,0 +1,33 @@
+.org $1FFF
+JMP program
+
+font:
+    .include "font.bin"
+
+program:
+    MOV 13, V0 ; Load character #12
+    MOV 0, V1 ; X position
+    MOV 0, V2 ; Y position
+    MOV 1, V3 ; Color (1 = white)
+    CALL write_char ; Call function to write character
+    SUS
+
+write_char:
+    ; V0: Character to write
+    ; V1: X position
+    ; V2: Y position
+    ; V3: Color
+    ; Write a character to the screen at (V1, V2) with color V3
+    
+    MUL V0, 64 ; V0 = Character * 64 (character size)
+    MOV AX, V0 ; Store result back into character
+    
+    MUL V2, 64
+    ADD AX, V1
+    MOV AX, V4 ; V4 = X position + Y position * 64 (screen index)
+    
+    MOV [V0 + $1FFF], V5 ; Read character
+    MUL V5, V3 ; V5 = Character * Color (color index)
+    MOV AX, V5 ; Store result into V5
+    MOV V5, [V4 + $3FFF] ; Write character to screen memory
+    RET
\ No newline at end of file