tcc: Initial commit

README.md

@@ -1,5 +1,6 @@
 # fox32 Demos and Tutorials
 
+ - [boot](boot) - bootable demo programs
  - [demos](demos) - demo programs
  - [tutorials](tutorials) - getting started tutorials
  - [cputest](cputest) - CPU test suite

boot/tcc.asm

@@ -0,0 +1,29 @@
+; tiny code christmas in fox32 assembly. draws a little pattern to the screen
+; run this as a boot sector (i.e. pass to fox32 as a bootable disk)
+
+    opton
+    org 0x00000800
+
+    mov r11, 479 ; Y counter
+y_loop:
+    mov r10, 639 ; X counter
+x_loop:
+    mov r0, r10
+    mov r1, r11
+    add r1, 16
+    mov r2, r10
+    xor r2, r11
+    rem r2, 3
+    mul r2, 128
+    or r2, 0xFF000000
+    call [0xF004201C] ; draw_pixel_to_background
+    dec r10
+    ifnz rjmp x_loop
+    dec r11
+    ifnz rjmp y_loop
+
+    rjmp 0
+
+    ; bootable magic bytes
+    org.pad 0x000009FC
+    data.32 0x523C334C