On 25/10/2015 08:27, "tony duell" <a...@p850ug1.demon.co.uk> wrote:
>> Further digging into available eproms that the programmer can read reveals >> it CAN read 2532s, specifically the MCM2532 which the datasheet tells me has >> the same pinout as the 2332. I still get "reverse insertion error" so I'm >> guessing my PROMs are toast. > > As others have said, normally when putting a smaller chip into a programmer > with a bigger socket you keep the 'bottom row' of pins -- including ground -- > in the same position for all chips. A look at the pinouts will show why. But > as > you can read 2716s that's not the problem. > > Often 'reverse insertion error' means the chip drew the wrong supply current > -- > often far too much. Which does suggest your ROMs are dead :-( Ah, OK, that makes sense. Bad ROMs and low-quality sockets are the chief reasons for dying PETs so it doesn't surprise me. I've found some 2532s pretty locally so hopefully they'll be with me on Tuesday and I can test yesterday's soldering. Wish there was a more local hobby/electronic shop here - I miss being in a city but only for that reason :) Given that there are schematics for PET testing boards like the PETVET I'd like to build my own. Nearest component place is M*plins and they're not what they used to be. Cheers! -- Adrian/Witchy Binary Dinosaurs creator/curator Www.binarydinosaurs.co.uk - the UK's biggest private home computer collection?
