YES, this is what I'm looking for: simple and 6502 driven!
Thank you very much !!!

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I have updated the 65SPI project on my website. I had originally set all of the Slave Select (SS) outputs to default to low. However, most if not all SPI devices have active-low SS pins. I have updated the device to initialize with the SS pins high and updated the datasheet accordingly.

Thanks to Andre for pointing this out. I had corrected this with the SBC-3 and SBC-4 versions, but forgot to go back to the original 65SPI and fix it there.

Here's a link to the 65SPI Page:

http://sbc.rictor.org/io/65spi.html

There's a download link at the bottom of the page.

Daryl

One thing to note on the topic of the XC9572 CPLD is that Rochester Electronics are still making them. Trouble with them is that they have a minimum purchase price of $100(probably USD) on them, and unfortunately, they aren't available in PLCC, but it appears that the 3.3v ones(100-pin TQFP only) can be run at 5v(just from a quick look at the datasheet).

These might be viable, but it may be a bit of a pain to do. It would probably need a breakout board(in my ignorant opinion).

Many thanks to Dr Jefyll for bringing up Rochester Electronics, here.

Just to be unambiguous, Rochester has a 100 dollar minimum per order, not per item.

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x86?  We ain't got no x86.  We don't NEED no stinking x86!

Ooh, good thing you picked up on that, BDD. That would've bit someone where it hurt.

You're welcome! But I'm just as surprised as you are. (I only searched a few parts, but I found stuff I thought I'd never see again.)

Huh? Are we looking at the same site?? What I get is 100 dollar minimum per line (ie, quantity of a single item), and a 250 dollar minimum per order (or pay the difference as a service charge).

"Note: To meet the $100 line minimum the minimum order qty for this part is 295."
"Note: Orders under $250 can be completed if you agree to accept a service charge."

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In 1988 my 65C02 got six new registers and 44 new full-speed instructions!
https://laughtonelectronics.com/Arcana/ ... mmary.html

A group-buy could make that workable - if 10 people want something, it could be approx $10 each, double that for shipping, and that's a good price for something you can't get anywhere else - even if you end up with lots of parts when you only needed two or three!

Oops! You are right! I apparently can't see that print due to color, but my wife, who happened to be looking over my shoulder as I was reading your post, could see it. Good thing I have her around.

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x86?  We ain't got no x86.  We don't NEED no stinking x86!

Hullo, Mrs Dinosaur! Nice to have you with us!

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In 1988 my 65C02 got six new registers and 44 new full-speed instructions!
https://laughtonelectronics.com/Arcana/ ... mmary.html

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x86?  We ain't got no x86.  We don't NEED no stinking x86!

Step 1 of converting the 65SPI from a Xilinx 9572 to Atmel 1504 is finally done. I have a successfully compiled JED file. I had to remove a few features to get it to fit.

Step 2 will be trying to optimize the code to fit a few features back into the design, if possible.

Step 3 will be to actually test a ATF1504 on my SBC-4 using the CF adapter and the ENC28J60 Ethernet module.

Stay tuned. My progress will be slow, but I'll do my best to keep it moving.

Daryl

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Please visit my website -> https://sbc.rictor.org/

Was this due to insufficient logic resources, insufficient pins, or both?

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x86?  We ain't got no x86.  We don't NEED no stinking x86!

Really not sure... it would not provide a fit report for some reason and the error reports I could find talked a bout conflicts with clocks. I suspected the latches I had were the problem so I eliminated the clock divider and associated latches. I had also added some intermediate logic to help simplify some of the state machine logic. The current resource usage is:



I have enough pins but the logic cells are nearly maxed so that may have been one problem.

The current setup has all features except the SPI clock divider. There are 2 clock choices: use PHI2 or an external shift clock. 95% of the time I ran the SPI clock direct from PHI2 on both SBC-3 and SBC-4, so I'm not too worried about losing that option. I really need to go back now and verify all the other logic translated correctly and that the state machine functions are still correct.

Daryl

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Please visit my website -> https://sbc.rictor.org/

Are you letting the fitter decide where to place pins?

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x86?  We ain't got no x86.  We don't NEED no stinking x86!

In my experience, it mainly refuses to spit out a fit report if you have a semantic (not syntactic) error in the CUPL code. E.g. you make reference to a NODE's output, without defining the necessary inputs (such as .d & .ck) for it to know what kind of NODE it is.

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Want to design a PCB for your project? I strongly recommend KiCad. Its free, its multiplatform, and its easy to learn!
Also, I maintain KiCad libraries of Retro Computing and Arduino components you might find useful.