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Test the Olduino Board

At this point you can test the olduino board on its own and with the 1802.

First I usually continuity check power and ground at each chip to the serial connector and the 30 pin membership card connector and make sure I don’t have a short. Then I connect the power/serial cable and check for +V everywhere it ought to be.

At this point I will disconnect the power and install a programmed atmega328p chip. A terminal program at 57600 baud on the attached PC should show the atmega saying something like “run1802….” a couple of seconds after power is applied or after reset is pressed.

I would then power off, insert the rest of the chips, and power on briefly to make sure nothing is heating up.

If that’s ok I would risk installing the olduino on the cpu card. Again, check for anything heating up.

If that’s all fine, you can exercise the 1802 a bit if, right after reset or power on, you send a ? from the terminal program. This tells the AVR to install a tiny program in the 1802 and run it. This is just 7B 7A 30 00, but you should see the Q LED light at half power and if you have a scope or logic analyzer you can test for an on/off sequence.

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