From f7733f1e740d37c4c9cd6ff53a33ea7b6d8f7f0e Mon Sep 17 00:00:00 2001
From: pantonshire <tom@tomandtally.co.uk>
Date: Sat, 29 Jun 2024 11:12:32 +0100
Subject: [PATCH] estoy loopin

---
 boot0.s | 30 +++++++++++++++++++++++++-----
 1 file changed, 25 insertions(+), 5 deletions(-)

diff --git a/boot0.s b/boot0.s
index f7551ac..71f1f90 100644
--- a/boot0.s
+++ b/boot0.s
@@ -20,17 +20,37 @@ bits 16
   mov ax, 0xb800
   mov fs, ax
 
+  ; Set VGA mode
+  ; https://mendelson.org/wpdos/videomodes.txt
   mov ah, 0x00
   mov al, 0x03
   int 0x10
 
-  ; Hi!
-  mov word fs:[0x0000], 0xc048
-  mov word fs:[0x0002], 0xc069
-  mov word fs:[0x0004], 0xc021
-
+  ; Reveal the true nature of jen
+  xor bx, bx
+  mov ax, 17
+loop:
+  cmp ax, bx
+  jle done
+  lea si, [womble + bx]
+  mov dh, [si]
+  mov di, bx
+  shl di, 1
+  mov byte fs:[di], dh
+  mov byte fs:[di + 1], 0x1f
+  inc bx
+  jmp loop
+
+done:
   hlt
 
+womble:
+  db "jen is a womble!"
+
+  ; TODO: enable A20
+
+  ; TODO: load a second stage
+
   ; TODO: grab all the info we can from bios interrupts and deliver it to ths OS nicely
   ; e.g. in a fixed memory location