What is your experience as regards to inserting an EPROM the wrong way into the socket - does it always result in instant death for the EPROM?
The EPROM is a n AT27C1024 for Mega CD 2 region free bios. After getting rid of the old bios and installing a bios socket I dicked up and put the bios in the wrong way - tried it a few times but just got a black screen. Then noticed my mistake, put it back in the correct way but still just a black screen.
I ordered another one, but since I cut my stock bios out and desoldered the remains I don't have a bios to test with at the moment to verify whether its the region free bios that got fried or whether its another problem altogether. I don't have an EPROM programmer to verify the chip contents or burn a new one myself.
The EPROM is a n AT27C1024 for Mega CD 2 region free bios. After getting rid of the old bios and installing a bios socket I dicked up and put the bios in the wrong way - tried it a few times but just got a black screen. Then noticed my mistake, put it back in the correct way but still just a black screen.
I ordered another one, but since I cut my stock bios out and desoldered the remains I don't have a bios to test with at the moment to verify whether its the region free bios that got fried or whether its another problem altogether. I don't have an EPROM programmer to verify the chip contents or burn a new one myself.