Ys IV: The Dawn of Ys

Ys IV: The Dawn of Ys is Hudson's take on Ys IV and the final entry in the series to be released on the PC Engine.

Hudson took significant liberties with the development of this port, and the differences in plot means it's not to be confused with the other game known as Ys IV... or the other one... or that one either.

Debug Mode#

To enable debug mode, the byte at 21-bit address $D1CBA needs to be constantly replaced or substituted with the value of $01. This can be achieved in Mednafen by following these keyboard instructions:

• ALT + C
• Command: 2 (Cheat Search...)
• Command: 1 (Add Cheat)
• Name: Debug Mode
• Type: S
• Address: $D1CBA
• Value: $01
• Enable: Y
• Add cheat confirmation: Y

To use the debug mode on a real system, or an emulator without cheat functionality, patch track 2 and track 32 at offset $218AB (assuming 2048-bytes-per-sector rip), replacing $9C with $8D.

Debug Area#

Choose "Beginning" at the title screen to start in a special debug area, with various NPCs you can talk to to activate various debugging features.

Debug Menu#

To activate the debug menu in-game, hold I while pressing II.

• STAT: Set debugging flags.
• EXP: Add 100 exp.
• GOLD: Directly set gold quantity.
• HP/MP: Manipulate current HP and MP.
• GOODS: Select and add items to the inventory.
• MUSIC: Play CD-DA music and ADPCM voice acting.
• FLAG: Set game state flag(?).
• F-MAP: View game state flags(?).