25 Oct
2015
25 Oct
'15
4:17 a.m.
On 25/10/2015 08:27, "tony duell" <ard at p850ug1.demon.co.uk> wrote:
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?
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 :-(