Search found 4 matches

by MatCat
Thu Oct 10, 2019 4:38 am
Forum: Newbies
Topic: Having problem getting W65C02S to work Paired with ATMEGA644
Replies: 10
Views: 2174

Re: Having problem getting W65C02S to work Paired with ATMEG

I have already done EA nop gen test, it will cycle all the way around the full address space, so the address is certainly communicating properly, which also makes me think data is as well if it can read EA's. I am at this point thinking all 3 of these are either fake or bad from the seller I got ...
by MatCat
Wed Oct 09, 2019 5:26 pm
Forum: Newbies
Topic: Having problem getting W65C02S to work Paired with ATMEGA644
Replies: 10
Views: 2174

Re: Having problem getting W65C02S to work Paired with ATMEG

Yes, I have it doing 100 cycles now during reset, doesn't make a difference.
by MatCat
Wed Oct 09, 2019 2:40 am
Forum: Newbies
Topic: Having problem getting W65C02S to work Paired with ATMEGA644
Replies: 10
Views: 2174

Re: Having problem getting W65C02S to work Paired with ATMEG

arranged my loop as specified above but no dice, same output, also I am starting to really wonder why RWB isn't working, sometimes goes high and stays high, often times it just stays low, I have measured with scope and multimeter the 6502 is just not driving RWB high and I have no idea why.
by MatCat
Tue Oct 08, 2019 6:22 pm
Forum: Newbies
Topic: Having problem getting W65C02S to work Paired with ATMEGA644
Replies: 10
Views: 2174

Having problem getting W65C02S to work Paired with ATMEGA644

So I paired a W65C02S with an ATMEGA644A to do some testing, below I have the output from serial as well as the source code running to interact with the 6502, howver as you can see from the output its not quite working right. It properly follows the FFFC vector, and appears to read the first opcode ...