C64 EPROM PLA replacements). It sort of works, but with mixed results, better on some boards than others.
this video shows you can get a similar effect by adding some additional capacitance to the pin.
diagnostics cartridge and test harness and with an assortment of games it seems to run well,
* N.B. when I say black screen, this is video sync but only a black screen displayed. This is different from no video sync, which usually indicates the VIC II chip is at fault.