Search found 13 matches

by kasrym
Sat Nov 29, 2014 5:10 am
Forum: Newbies
Topic: Hello. Is this a 6502?
Replies: 27
Views: 3393

Re: Hello. Is this a 6502?

Would adding 2 22pF caps between both pins of the crystal and ground force the clock to oscillate?

I have read both of the pdfs on your primer, and the circuit you have at the top is the one that I am using, I just didn't know if anything is omitted to simplify it. I could do a Colpitts, but I ...
by kasrym
Sat Nov 29, 2014 4:39 am
Forum: Newbies
Topic: Hello. Is this a 6502?
Replies: 27
Views: 3393

Re: Hello. Is this a 6502?

Would adding 2 22pF caps between both pins of the crystal and ground force the clock to oscillate?
by kasrym
Thu Nov 27, 2014 6:56 am
Forum: Newbies
Topic: Hello. Is this a 6502?
Replies: 27
Views: 3393

Re: Hello. Is this a 6502?

Thanks Mike. One of the fun things about accelerated AA courses are the loss of things. I vaguely remember anything about hysteria.
I wasn't exactly hysterical about it, but I remember being up against a deadline, and my blood pressure had reached an unhealthy level because of it! :shock:

Put in ...
by kasrym
Thu Nov 27, 2014 6:26 am
Forum: Newbies
Topic: Hello. Is this a 6502?
Replies: 27
Views: 3393

Re: Hello. Is this a 6502?

It does sound primarily like a clock problem. The reset circuit, not being debounced, is not adequate, but is probably not what's keeping it from toggling the address lines. The 7805 takes about 1.5V minimum, so if you're starting with 6V from the batteries if they're pretty new, you'll only get 4 ...
by kasrym
Thu Nov 27, 2014 6:20 am
Forum: Newbies
Topic: Hello. Is this a 6502?
Replies: 27
Views: 3393

Re: Hello. Is this a 6502?

nyef wrote:
Isn't that oscillator circuit supposed to have a couple of capacitors from each side of the crystal to ground? I'm not seeing any...
That's what I thought, but every schematic I've seen doesn't have them or specify values.
by kasrym
Thu Nov 27, 2014 5:26 am
Forum: Newbies
Topic: Hello. Is this a 6502?
Replies: 27
Views: 3393

Re: Hello. Is this a 6502?

Is 2MHz too high since my chip is non-suffixed?
by kasrym
Thu Nov 27, 2014 3:07 am
Forum: Newbies
Topic: Hello. Is this a 6502?
Replies: 27
Views: 3393

Re: Hello. Is this a 6502?

Here's my clock as of now.
by kasrym
Thu Nov 27, 2014 2:45 am
Forum: Newbies
Topic: Hello. Is this a 6502?
Replies: 27
Views: 3393

Re: Hello. Is this a 6502?

I have a 330ohm in series with the led. And 3.17k for NMI and IRQ. With a logic circuit I built on the top of the board I am not getting a clean high or low on 4 and 6. My clock signal should be clean, but I wont jave access to a scope until Dec 8th. Its clocked at 2MHz with a 7404 and a 1.8 across ...
by kasrym
Thu Nov 27, 2014 1:20 am
Forum: Newbies
Topic: Hello. Is this a 6502?
Replies: 27
Views: 3393

Re: Hello. Is this a 6502?

Ok. So to try to get this up and running, I am setting it for the NOP code. It comes on, the lights toed to the address bus are randomized and then it cuts off. Same result when I remove the clock. Any ideas?
by kasrym
Wed Nov 26, 2014 8:56 am
Forum: Newbies
Topic: Hello. Is this a 6502?
Replies: 27
Views: 3393

Re: Hello. Is this a 6502?

Thanks for the link Ed. Wouldn't the ready pin show a 1 since it's tied high?
by kasrym
Wed Nov 26, 2014 8:41 am
Forum: Newbies
Topic: Hello. Is this a 6502?
Replies: 27
Views: 3393

Re: Hello. Is this a 6502?

I will definitely go through your primer. And credit is due for the page its not mine. I actually found it off this site.
by kasrym
Wed Nov 26, 2014 8:09 am
Forum: Newbies
Topic: Hello. Is this a 6502?
Replies: 27
Views: 3393

Re: Hello. Is this a 6502?

Woot. Thanks for the quick response. I am trying to get it up and running, but for the project all I am getting is the lights to be solid. I dont know if its my oscillator. If I pull the power off my 7404 I get no change.

The project I am doing is http://www.reocities.com/SiliconValley/2072 ...
by kasrym
Wed Nov 26, 2014 7:52 am
Forum: Newbies
Topic: Hello. Is this a 6502?
Replies: 27
Views: 3393

Hello. Is this a 6502?

Greetings,
I am wanting to build a small setup, but I am needing to confirm if this 6502 is legit. Thanks!