Strangely enough, I have seen this weird sequence of reads to $FFFE-FFFF, with some $0000 and $017F randomly appearing, on my very first attempt at moving a breadboard design to perfboard. After days of messing with it and not getting it to properly reset, I concluded the 6502 must have been damaged ...

I have been messing around with the ATF22V10C recently. The ecosystem is all but non-existing; however, WinCUPL and WinSim run decently on Wine (expect occasional crashes, but nothing unmanageable). As for actually programming the chip, the algorithm is public knowledge by now (link at the beginning ...