1 Meg Agnus?
Steve,
I'd suggest getting a good memory test program and testing all your
CHIP ram. What you are describing sounds like a memory failure at the top
of the 512K of CHIP RAM on your motherboard.
If everything is setup correctly, the machine should have no problems
setup for 1Meg of CHIP without the A501 installed. Another thing to check
is to see if the trace cut is really a trace cut, and not just a pin
lifted out of it's socket on the Gary chip.
Dean
DKB Software