I figured out how to program the chip correctly. Found the setting in the Topwin software. Was hard to figure out with badly translated sofware and manual.

Thank you all for the help, I finally got it going. This last problem was just a simple problem with my program and the address I was using to write to the 6551.

I have just 1 last question Michal Kowalski's Simulator to compile my program. my EEPROM is at E000-FFFF so for it to compile and use ...

I am using a TTL Oscillator. All the control pins look to be correct and are all tied low, or properly low.

Maybe I will try a crystal.

If the 6551 is not transmitting shouldn't the TxD pin be running low Instead of High?

Well I got the new chip, but I am still having problems. CTA and RTS are both low, so it should be able to send, but it wont the RxD and TxD pins stay high with no movement. If I pull the TxD wire I will get gibberish on the pc. anyone have any other ideas?

Well, With all the problems I have been having with it I ordered a G65SC51P-2 and will try that when it arrives and report back if it helped

Thanks for the tips, I have changed to code to be sure that it checks the TX buffer, and double checked my wireing, From what I can tell it should work with even just the tx and rx conneted and the other pins grounded.

the RTS pin is alwase high, what conditions cause it to run high?

*=$E000 ...

I have tried many different wiring Schematics this is the one I have setup now http://members.multimania.co.uk/leeedavison/6502/acia/index.html

I am using a 9pin Null modem cable to my computer. I am using putty and have tried all the different flow controlls but can just not get it to work. When ...

It would be nice if digikey would cary it.

Yea, The chip is a bit more, but Apatco is in Canada and if asked will give you a quote with the exact shipping, I ordered a 65c02, 65c22 and 65c816 and shipping was only $1.04

And coming from canada there will be no duty or broker fee's

They where very quick to respond to the shipping questions ...

Well it took me longer then I want to admit to figure it out...but.
It was a simple problem with the simple program I made to loop around, When I mad it, I was telling the Assembler the program was at 0000 so it would burn properly with my chip writer. so when it would loop using a label it would ...

Thanks, Looks like I will get it from Apatco they have much better shipping rates. However both WDC and Apatco, do not supply the 65c51 for some reason

I Want to buy a WDC 6c02, 65c22 and 65c51 and maybe a 65c816 but I can not find a place to buy one. It looks like I could buy some of them(not the 65c51?) from WDC Directly but as I live in canada they want $25 to ship and a $15 handling fee(plus duty and taxes) it looks like Digikey nor Jameco has ...

I have Brand boarded a simple 6502 computer but it does not seem to want to function correctly, and I lack some of the tools that may be needed to test, but maybe someone can help me out.

When I turn the unit on with some basic commands in the memory all it wants to do is turn all the address lines ...

Well, once again I cleaned up the code and added some extra comments.

Removed a lot of the fluff from the 6551 IRQ functions still need to add some more stuff to make it fully functional but it should at least print the welcome msg and print it again when I enter the "ver" command

http://pastebin ...

Yea some of the comments got messed up when I pasted some, commands got changed and the comments did not. I tried to clean it up a bit here is a updated past. Besides that anything else scream out as bad?

http://pastebin.com/4fwMGnbj