7 Nov
2016
7 Nov
'16
10:52 p.m.
On 11/07/2016 03:32 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...
Got any old Adaptec SCSI controllers for PC? How about an old XT MFM
controller? Wangtek QIC36 tape controller?
The 8085s are all over the place. If you're buying NOS, I'd probably
go for the 80C85. Tundra made a pretty good one.
--Chuck