From 6c0ed6f7bb728734077c2830ea3681f6a54feddc Mon Sep 17 00:00:00 2001
From: "B. Watson" <urchlay@slackware.uk>
Date: Sat, 26 Apr 2025 05:49:57 -0400
Subject: Makefile: add DOS 2.5 test target.

---
 .gitignore        |   2 ++
 Makefile          |   6 ++++++
 README.txt        |  20 ++++----------------
 dos25_4drives.atr | Bin 0 -> 133136 bytes
 4 files changed, 12 insertions(+), 16 deletions(-)
 create mode 100644 dos25_4drives.atr

diff --git a/.gitignore b/.gitignore
index dc34f28..6342bfb 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,5 @@
+.*.swp
 reloc.atr
+reloc25.atr
 *.o
 *.xex
diff --git a/Makefile b/Makefile
index 6e1a27f..ed90eae 100644
--- a/Makefile
+++ b/Makefile
@@ -1,3 +1,9 @@
+all: reloc.atr reloc25.atr
+
+reloc25.atr: reloc.atr
+	cp dos25_4drives.atr reloc25.atr
+	axe -w autorun.sys reloc25.atr
+
 reloc.atr: reloc.xex hello40.xex hello41.xex mkrelocxex.pl autorun.sys
 	cp dos_20s.atr reloc.atr
 	axe -w autorun.sys reloc.atr
diff --git a/README.txt b/README.txt
index 5505d95..6c0a188 100644
--- a/README.txt
+++ b/README.txt
@@ -223,11 +223,7 @@ $00 40 - code_init
 
 High byte relocation table:
 
-$02 $40 ; hi byte of JSR $4007 operand
-$05 $40 ; hi byte of JSR $400E operand
-$09 $40 ; hi byte of LDA $4015 operand
-$10 $40 ; hi byte of LDA $4016
-$00 $00 ; terminator
+TODO: finish and fix.
 
 Program loads from $4000 to $4016. If MEMLO was $1CFC, the relocator
 will move the program to $1D00 - $1D16 and set MEMLO to $1D17. The
@@ -243,18 +239,10 @@ However, the relocator and tables are only used once, and can be
 overwritten afterwards (so they count as free memory).
 
 Relocation Table Format
+-----------------------
 
-Current implementation:
-
-A list of addresses that need to be adjusted (high bytes of absolute
-addresses), 2 bytes each, terminated with $00 $00.
-
-Possible future implementation:
-
-Bitmap. One bit per byte in the file. 1 if the address needs
-adjusting, 0 if not. This *probably* will actually be smaller than
-the list of addresses. Also has the advantage of being a fixed size,
-easily calculated/predicted.
+Bitmap. One bit per byte in the file, read from high bit to low. 1 if
+the address needs adjusting, 0 if not.
 
 The relocator is 256 bytes long or less.
 The GR.0 display list with a 16K cart in is at $7C20.
diff --git a/dos25_4drives.atr b/dos25_4drives.atr
new file mode 100644
index 0000000..2c2c85b
Binary files /dev/null and b/dos25_4drives.atr differ
-- 
cgit v1.2.3