A500 Weird Switch

[Super TWiT]

My A500 came in the mail today, and it seems to be working great but has a few oddities. The biggest of these is a strange switch that is installed on the front of the computer above the keyboard. It seems to have no purpose. Also, when plugging it into the TV, there is a loud humming noise coming from it. To top it all off, the trapdoor cover is missing. Mainly my confusion comes from the switch. Any ideas?

[Super TWiT]

I thought it might be a rom switcher too, but after starting it, flicking it, and starting it again it still displays ver. 1.3. Are these things hard to take apart. Maybe I should just get in there and see if its wired.

[Super TWiT]

I did infact get this from ebay, and it does say ICD on it. So you think the switch may be to a flicker fixer? I noticed the trap door cover was ripped off, so I think if it had one of these it was probably removed and sold sold separately.

[Super TWiT]

bm07 I congratulate you. After opening up the Amiga it turns out it was in fact an adspeed cpu upgrade. They must have literally drilled a hole in the top of the case to put that switch in! Thats what I call talent.