Commander X16

the value 9F will still be lingering on the data lines because of bus capacitance. I was wondering if that was it or if the KERNAL was doing it. That makes sense. I'm going to look even closer at the signals on the scope and see if I missed something on the write cycle. Thank you. I really apprecia...

I appreciate your response Kelli. I don't think that is it though as I can read the correct data from the device. I just can't seem to write anything other $9f to it. Somehow the KERNAL knows when IO is present (I still haven't wrapped my head around how it does this). For instance, if I don't have ...

Hello everyone, I've been working on a 10/100 NIC for a few weeks now and I almost have it working. For some reason though when I try to write to the card at IO3 ($9f61) or any other IO address, it always writes a $9f to the device. The chip that I am using for the ethernet controller is the Wiznet ...