Just finished a write up... my clock is finally up and running. No cheating with PICs, all 6502 here!

http://www.hack.net/nixie

Thanks for the help with my questions here guys, I ended up going with the 6522 per your suggestions!

-Ryan Brooks

Thanks for your help last night, Lee. Looking back, I guess I was up too late! Thank you!

-Ryan

Ph2 AND !R/W

By !R/W you mean R/_W from the 6502 but inverted correct? thnx

Hi all,

Updating my little 6502 design and wanted to use a '573 and '541 for i/o instead of the typical 6522.

For output, the 573 (aka 373 with a different pinout), would be set up with OC\ (1) tied low and E (11) as:
Ph2 NAND !R/_W AND OSEL
where OSEL is an active high signal for my address, no ...

Here's a possible problem and question:

Do I need to qualify my r/w* with P2, or just my CS* to my SRAM?

Thanks again.

Wow. Thanks for the responses.

On the SRAM test: yes, I am doing some writes to the sram, then some reads from eprom, a write to a different location in sram and then back to read the original values that I wrote. I learned some time ago that one write/read cycle even w/o a ram in the socket can ...

Hi All,

Thought I'd ask this question before I give up for the evening and go to bed. I'm currently bringing up a very simple 6502 system; 2kx8 sram, 8kx8 eprom, '138 decode and a latch as an output device for debugging.

I wrote a couple test programs that completed without errors, but as soon as ...