From c053056b8effb5c35454f8e90548f43be0ce1ef0 Mon Sep 17 00:00:00 2001
From: Uko Kokņevičs
Date: Sat, 24 Feb 2024 18:01:09 +0200
Subject: Initial Commit

---
 boot.asm | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 boot.asm

(limited to 'boot.asm')

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
-- 
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