Hi all;

I was reading through the instruction timing chart (table 6-5) of WDC's W65C02S datasheet (February 2004), as one does, and got a little confused when it comes to the behaviour of the BBRx and BBSx instructions.

It is my understanding that they have only 1 addressing mode which is really a ...

Thank you all for your feedback. I'm taking several points from this:


When an IC is declared "TTL compatible" it's more of a "for some values of TTL" statement than a formal declaration of adherence to the exact TTL thresholds.
You need some kind of historical awareness of what characteristics ...

Hi all;

I am measuring a solid 5V logic H level from the address bus output of a R65C02 that I am doing a project with, but the chip is designed to work at TTL levels and the Rockwell datasheet promises only at least 2.4V for a logic H.

In general I am interfacing to it using HCT logic, but as I ...