Happy New Year Everyone!
Over my 3 days off, I threw down a WDC6502 onto a breadboard. I did a modified 'Ben Eater', where I was driving the clock with a sketch I had written for Arduino Mega 2560. Unfortunately it didn't work, all I got on Address and Data lines was $FF. I don't have a scope, just a cheap TTL/CMOS logic probe. I haven't had time to get back into it, just I do have time while at work to read all these informative posts.
So, in Ben Eater's 6502 build, he doesn't use any pull-ups. When I read the datasheet for the WDC 65C02, I see this on the RDY line.
Quote:
The RDY pin no longer has an active pull up. It is suggested that a pull up resistor be used on this pin when not being used. The RDY pin can still be wire ORed.
I don't see this warning on any other lines, so... to pull-up or to not pull-up (with a resistor).
And what should the value of said resistor be. I see stuff ranges from 330 to 3.3 K.
Help!
Walter