Thanks for all the info! I'll try it out as soon as I've put my lab back together (probably in a few more weeks). This Corvid thing is getting in the way of my hobbies!

This is exactly what I needed! Thanks for the thorough details, I'll try it out this weekend.

Cheers.
Daniel

0.1uF caps, 220/330 resistor for the LED?
What is that component close to C28?

Cheers,
Daniel

Thanks for the gerber files! I ordered some to test it out for my ATF1504 chips.
Do you have a BOM for the other components?

Cheers,
Daniel

Hi Gordon, great to hear from you, I recently looked at your blog as I'm interested in other peoples designs and I really like your idea of using an atmega for SD card input etc. to avoid bitbanging it on the 6502.

My design actually already uses an atmega4809 chip, initially just as a bootloader ...

This document: http://ww1.microchip.com/downloads/en/DeviceDoc/doc0737.pdf
seems to indicate that only ATF1500 family devices from Atmel support the OE extension, although it's interesting that the Lattice GAL chips support it. I've seen documents claiming per pin OE support on the ATF22V10C as ...

Got it! Thanks for all the helpful tips everyone.
I'm going to try some things out and report back, maybe there is a way to get this working with either the power down pin or some other way (if I can find other peoples code for the ATF22V10 that should work).

Agreed, I do have a few lattice chips and no I'm not planning to sell this :) so I'll stick with them for now. It's just unfortunate I can't use any of my atmel chips I've bought.

I'm new to wincupl (not a great experience for writing code imho) so I wrote the logic in another editor. I wasn't sure ...

FWIW, Atmel's "zero power" series GALs power down the internal product-term circuitry when it's not required to save power, but the outputs are still correctly latched and driven. Those parts should however support the tri-state product term as well.

Yes I saw that section but like you say, tri ...

I've tried to but there are a lot of things I don't fully understand in there and OE / Output Enable is mentioned 2-3 times total and never with any details (as far as I can find).
It's specifically the output enable term that I want more details on.

To clarify, the programming seems to be working, although I'll run some more tests to triple check that, but the OE "flag" on the output pins don't seem to make any difference at all and since I'm not really clear on how this is achieved on the actual array, I'm stumped whether this is:
1. Supported ...

Good idea and I tried a standalone GAL vs ATF test already for this reason.
The output is correct on all the pins except for the tri-state when BOOTUP_OE is high. If I set BOOTUP_OE to high (with direct wiring), I get tri-state out on the lattice GAL chip but no difference at all using ATF (which ...

Yeah, I've heard a lot about that but the programmer claims to support these chips (TL866II+ programmer).

Hi!
I wonder if anyone here has experience with the Atmel ATF22V10C chips and using/programming them?

Since the Lattice versions has been discontinued I bought some of the Atmel chips but programming them I've seen some issues.
I use one of these for memory bank selection, basically replacing A13 ...

Hi everyone, I've been using these forums for quite a while but my project is growing so I figured it's time to create an account and bother the experts around here with (hopefully) a mix of hard and easy questions I've stumbled upon.

I'm yet another software guy but I got the theory in school ...