Initial CommitHEADmain

1 files changed, 49 insertions, 0 deletions

diff --git a/boot.asm b/boot.asm
new file mode 100644
index 0000000..f80ba16
--- /dev/null
+++ b/boot.asm
@@ -0,0 +1,49 @@
+;; This thing is licensed under Creative Commons Zero v1.0 Universal, which essentially means
+;; "Public Domain".  (You can do anything you want without asking for permission).
+;;
+;; SPDX-License-Identifier: CC0-1.0
+;;
+;; To compile
+;; $ nasm -f bin -o boot.bin boot.asm
+;;
+;; To run
+;; $ qemu-system-i386 -fda boot.bin
+;;
+;; You can also run this by burning it to a floppy or a hard drive but I am not to be held
+;; responsible for any lost partitions, filesystems, or bootloaders.
+
+BITS 16
+
+    mov ax, 0xB800
+    mov es, ax
+    xor di, di
+
+    mov ax, 0xBB20
+    mov cx, 80*5
+    rep stosw
+
+    mov ah, 0xDD
+    mov cx, 80*5
+    rep stosw
+
+    mov ah, 0xFF
+    mov cx, 80*5
+    rep stosw
+
+    mov ah, 0xDD
+    mov cx, 80*5
+    rep stosw
+
+    mov ah, 0xBB
+    mov cx, 80*5
+    rep stosw
+
+halt:
+    cli
+    hlt
+    jmp halt
+
+    ; There's still ~463 bytes free here
+
+    times 510-($-$$) db 0
+    dw 0xAA55