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Old 2nd Dec 2022, 12:54 pm   #65
SiriusHardware
Dekatron
 
Join Date: Aug 2011
Location: Newcastle, Tyne and Wear, UK.
Posts: 11,484
Default Re: Tesla Programmer

Can I ask you which Arduino pins you're using to:-

-Drive the 9 PROM address pins
-Read the 4 data bits in
-Write the 4 data bits out
-Toggle the VCC supply volts to the chip
-Enable data output from the chip

Since all of these connections from mine to Chris's PCB will be by flying wires I am not committed to a particular connection scheme so it might make sense if I adopt roughly the same pin-> function scheme as you, especially if I switch to the UNO.

Where I'm driving address lines on a PROM or some such I tend to use the A0... to Ax... (analogue) pins as high as they go on the particular Arduino for the address lines before continuing on with pins 2,3,4.... (1 and 2 being tied up with the comms to the host).
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