Its a very rare occasion that I cannot dump a 16L8 device. There has only ever been once in the past where I have failed in this and that was with a Namco chip that uses heavy feedback.
Recently I’ve been trying to dump the HAL16L8 device from an Amstrad 6128 but its just not happening.
The chip seems to have some kind of flip flop implementation that I cannot reliable dump automatically or figure it out in my head.
I’ve tried quite a few different approaches but cannot get this to work. Even with a logic analyser setup its quite elusive.
I’ve been through all the info I can find online and while it all makes sense, it does not help me implement the equations properly.
The devices I’ve tested are locked so cannot be read out with a programmer but if you have anything to offer or can even supply a proper dump then could you please pass it on.