beholder wrote:
Ok! Got my first serial data sent back and forth between my computer and the SBC!!!!!
Hurray!
I bet that feels good. Congrats!
Quote:
It's so bizarre, all I have to do is switch the oscillator with the arduino and it works! I can see in my terminal window the word "OK"
At least now I know is something to do with my 1MHz can oscillator.
Is it still the same oscillator with the TTL output? The 74HC541 you're using as a buffer actually isn't appropriate, as its inputs aren't rated to accept TTL levels -- just as the inputs on the 'C02 aren't rated to accept TTL levels. (It's more or less a fluke that the 74HC541 made any improvement. But it's not unusual to see bizarre stuff in circumstances like this.)
Do you have a 74HC
T541 -- or some other 74HCT chip -- that you could use as the buffer? 74HCT chips do accept TTL levels at their inputs.
Alternatively, you could try adding a pullup resistor (say 2.2 or 3.3K) from the osc. output to VCC. Better yet, get rid of that darn oscillator and replace it with the proper part!
-- Jeff
_________________
In 1988 my 65C02 got six new registers and 44 new full-speed instructions!
https://laughtonelectronics.com/Arcana/ ... mmary.html
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