If you were on this side of the pond it would be easy.
The 8085A is a really common part with many vendors and all work.
Also if a different one gets hot (they nominally run warm not hot to the
touch)
check to see if there is a bus or address driver shorted or stuck in the
wrong direction.
Make sure the 8085A is the only warm part.
Allison
On 11/07/2016 06:32 PM, Adrian Graham wrote:
Hi folks,
Still working on this STC Executel and it looks like the CPU isn't too good
given how hot it gets within a minute or so. The display is the same whether
there's a CPU physically present or not. I built this circuit to test it:
http://saundby.com/electronics/8085/freerun.shtml
Using a 4mhz crystal the address lines are all over the place - I'm using a
logic analyser rather than LEDs.
Has anyone got a spare they'd like to sell me? I'm struggling to think of
something I've got that may have a socketed 8085...