Dungeon Master for PC-9801

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Editions

Version 2.0 Japanese, 8-bit graphics: Dungeon Master (Japan, PC-9801)
8-bit FTL Logo
Dungeon Master (Japan, PC-9801)
8-bit Title
Dungeon Master (Japan, PC-9801)
8-bit Main Menu
Dungeon Master (Japan, PC-9801)
8-bit Credits
Dungeon Master (Japan, PC-9801)
8-bit Dungeon view
Dungeon Master (Japan, PC-9801)
8-bit Inventory
Version 2.0 Japanese, 16-bit graphics: Dungeon Master (Japan, PC-9801)
16-bit FTL Logo
Dungeon Master (Japan, PC-9801)
16-bit Title
Dungeon Master (Japan, PC-9801)
16-bit Main Menu
Dungeon Master (Japan, PC-9801)
16-bit Credits
Dungeon Master (Japan, PC-9801)
16-bit Dungeon view
Dungeon Master (Japan, PC-9801)
16-bit Inventory

Retail price: ¥9800
Known versions:

These versions consist of PC-9801 disk images in HDM format.
Dungeon Master for PC-9801 2.0a (Japanese) Original (Not working).hdm

This is an image of the original floppy disk (except the copy protection sector) and cannot be started because of the copy protection.

Dungeon Master for PC-9801 2.0a (Japanese) Cracked.hdm

Dungeon Master for PC-9801 2.0b (Japanese) Original.hdm

This is an image of the original floppy disk. This version is newer, contains some bug fixes and is not copy protected.

To apply the crack, follow these steps (this applies to version 2.0a, version 2.0b is not copy protected and does not need cracking):

Open the file NECIO.EXE in a hexadecimal editor.
Go to offset 1CF1h and replace ‘74 03 EB 62’ by ‘EB 64 EB 62’. This will remove the protection check when you start a new game.
Open the file FIRES.EXE in a hexadecimal editor.
Go to offset 2636Dh and replace ‘26 FF 5F 58’ by ‘90 90 90 90’. Although not mandatory for the crack to work, this will disable attempts to read the copy protection sector from the floppy disk, which would fail anyway when using a copied disk.
Go to offset 263A3h and replace ‘4F 74 01’ by ‘4F 74 00’.
Go to offset 263BDh and replace ‘4F 74 03’ by ‘4F 74 00’. This will cause copy protection sector checks to always succeed.