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[keops]

Originally Posted by outofsanity

To fix the runtime error:
use an hex editor and change the bytes at offset 0x14030 from f7 f3 to 90 90
inside the PS10.EXE version 1.05 (from the csmtcpip patch).
Chasm works fine @640x400 inside dosbox with core=dynamic.

Thank you for your help. This is one of my favorite games and I'm glad I can now play fluently at 640x480. To offer compensation for your advice, I can give you my personal map made for Chasm: the Rift - Animal Funhouse - where you can fight with the enemies of your choice or set them to fight against each other.