This is a patch for Deep Dunegon: Madou Senki for FDS.
It adjusts the deathblow damage calculation.

When you score a deathblow, your attack power is tripled.
If you have an attack power over 85 (effectively 255 AP), this will overflow
the damage counter, which is restricted to 1 byte.
The game detects this, and attempts to compensate by raising your attack power
an additional time.
However, this results in you doing still less damage than a normal hit.

Two solutions: use which you think is better.
Patch 1 caps AP at 255.
Patch 2 will do 255 damage if overflow is detected.

Use the "eng" patch on top of a patched disk image of my translation.
Use the "jp" patch on top of an original Japanese disk image.