initial commit

1 files changed, 26 insertions, 0 deletions

diff --git a/README b/README
new file mode 100644
index 0000000..7a54f8a
--- /dev/null
+++ b/README
@@ -0,0 +1,26 @@
+This will be a commented disassembly of the Atari 8-bit computer
+Defender cartridge.
+
+I found 2 versions of the ROM. "defender.rom" is from here:
+
+http://www.atarimania.com/game-atari-400-800-xl-xe-defender_1561.html
+
+defender.8humans.rom is found in both the Holmes Archive and the TOSEC
+collection (Atari_8_bit_TOSEC_2012_04_23.zip).
+
+These are almost identical. See "notes" for differences between the two
+images. It turns out that the 8 humans version is a badly done crack,
+that must have been converted from a cracked XEX back into a ROM!
+
+$ md5sum *.rom
+e8d52b4aa33da38f99312f9aa8b48885  defender.8humans.rom
+8709351e76ec7c407e63c47ac53f8d19  defender.rom
+
+Disassembly is done with da65 (from the cc65 suite), using the old
+"edit the da65 .info file, disassemble, name things, edit again, etc"
+cycle. At some point, I'll clean up the formatting to make it look more
+human-readable, and use some conditional assembly (ifdefs) to allow
+assembling either version, and maybe as either a .xex or a ROM.
+
+At any point, you can check whether the disassembly really assembles
+back into the original ROM image by running "make test".