From 7a8d2bcd75d88a5429937bf551878c55e1dcf0fd Mon Sep 17 00:00:00 2001
From: Melodi <62381002+Melodi17@users.noreply.github.com>
Date: Wed, 6 Aug 2025 22:36:34 +1000
Subject: moved everything to seperate projects, and started compiler work +
 push and pop instructions added

---
 ROMs/hello_world.asm | 42 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 ROMs/hello_world.asm

(limited to 'ROMs/hello_world.asm')

diff --git a/ROMs/hello_world.asm b/ROMs/hello_world.asm
new file mode 100644
index 0000000..1d812fb
--- /dev/null
+++ b/ROMs/hello_world.asm
@@ -0,0 +1,42 @@
+.org $1FFF
+JMP program
+
+font:
+    .include "font.bin"
+
+program:
+    MOV 0, V0 ; Load character #12
+    MOV 0, V1 ; X position
+    MOV 0, V2 ; Y position
+    MOV 1, V3 ; Color (1 = white)
+    CALL write_char ; Call function to write character
+    SUS
+
+write_char:
+    ; V0: Character to write
+    ; V1: X position
+    ; V2: Y position
+    ; V3: Color
+    ; Write a character to the screen at (V1, V2) with color V3
+    
+    MUL V0, 64 ; V0 = Character * 64 (character size)
+    MOV AX, V0 ; Store result back into character
+    
+    MUL V2, 64
+    ADD AX, V1
+    MOV AX, V4 ; V4 = X position + Y position * 64 (screen index)
+    
+    MOV V4, [$EFFF] ; Debug
+    
+    MOV [V0 + $2003], V5 ; Read character (1FFF + 4 since jump address is 1FFF)
+    MOV V5, [$EFFF] ; Debug
+    AND V5, $01 ; Mask to get first bit (color)
+    MOV DX, V5
+    MOV V5, [$EFFF] ; Debug
+    MUL V5, V3 ; V5 = Character * Color (color index)
+    MOV AX, V5 ; Store result into V5
+    
+    MOV V5, [$EFFF] ; Debug
+    
+    MOVB V5, [V4 + $402F] ; Write character to screen memory
+    RET
\ No newline at end of file
-- 
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