From 72bb6ddc77b137f639cbc6c515b37e2bc0a4c8cc Mon Sep 17 00:00:00 2001
From: Jeremiah Orians <jeremiah@pdp10.guru>
Date: Fri, 20 May 2016 21:10:56 -0400
Subject: [PATCH] Started to incorporate notes into this project

---
 notes.org | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)
 create mode 100644 notes.org

diff --git a/notes.org b/notes.org
new file mode 100644
index 0000000..047db0e
--- /dev/null
+++ b/notes.org
@@ -0,0 +1,48 @@
+* Platform specific information
+** 8086
+*** Default memory map
+16-bit mem map	(seg:off)
+0x0000:0x0000 -> 0x0000:0x0500  BIOS stuff
+0x0000:0x0500 -> 0x0000:0x2100  root
+0x0000:0x2100 -> 0x0000:0x3300  fat
+0x0000:0x3300 -> 0x0000:0x6c00  14,25kb free space
+0x0000:0x6c00 -> 0x0000:0x7c00  IDT and GDT (256 desc. eatch)
+0x0000:0x7c00 -> 0x0000:0x7e00  bootsector
+0x0000:0x7e00 <- 0x0000:0xffff  ~32,5kb stack for boot
+0x1000:0x0000 -> 0x9000:0xffff  576kb free space
+0xa000:0x0000 -> .............  VGA mem etc.
+
+*** Restart code
+To restart the segment loaded from the bootsector:
+68007C		; push 7C00
+C3		; ret
+
+For an intersegment restart:
+6A00		; push 0
+68007C		; push 7C00
+CF		; iret
+
+* Testing notes
+** Making blank floppy disk images
+dd if=/dev/zero of=$filename.img count=1440 bs=1k
+
+** Changing floppies inside of qemu
+While qemu is running it is possible to change floppies
+To achieve this you first must enter the qemu monitor by pressing:
+Ctrl-Alt-Shift-2
+
+You then may change the floppy by typing:
+change $drivename $filename
+
+for example to use the file blank_floppy.img in the A drive:
+change floppy0 blank_floppy.img
+
+** Building binaries for testing
+*** stage0_monitor
+There are literally hundreds of ways of building the root bootstrap binary.
+All that is required is a simply hex compiler written in any language on
+any system available to the user.
+This repository contains a hex compiler written for linux in hex and assembly as
+well as a platform independent C implementation.
+Then to complete the build process write to the master boot record of a floppy disk.
+Or should you desire simply use qemu to boot the compiled file directly.