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Author Topic: CIA Question for FPGA Experts  (Read 3644 times)

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Offline downix

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Re: CIA Question for FPGA Experts
« on: November 28, 2007, 05:44:36 PM »
Don't see why it would be that difficult.  How about I mess with the MiniMig's limited CIA's and see if I can expand them to full complience?
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Offline downix

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Re: CIA Question for FPGA Experts
« Reply #1 on: November 28, 2007, 06:37:33 PM »
Quote

Plaz wrote:
@downix

Quote
Don't see why it would be that difficult. How about I mess with the MiniMig's limited CIA's and see if I can expand them to full complience?


Awesome if you could use minimig as a headstart. Minimig CIA should be similar to those used on A500/2000/3000. I don't know if the surface mount versions on A1200/4000 are different.

Plaz

Not internally, no.  Incidentally, the C128 had a CIA as well.
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Offline downix

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Re: CIA Question for FPGA Experts
« Reply #2 on: November 28, 2007, 07:42:54 PM »
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Plaz wrote:
@Zac67

Thanks for the CIA lesson. Interesting about using 8520's in even a C64.

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Are 8520s hard to get? Vesalia has them in stock for 6.90€ (DIL) or 3.90 (PLCC) - no way to beat that price with an FPGA!


I saw that today also. I wonder how their stock is holding up. Has any one made CIAs in 10 years?

Plaz

Don't think so, but I'm studying the MiniMig's one as we speak so who knows.
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Offline downix

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Re: CIA Question for FPGA Experts
« Reply #3 on: November 28, 2007, 11:35:26 PM »
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Belial6 wrote:
@Downix

You know, I'm really looking forward to seeing something come out for the MiniMig from you.  Almost every time you post, you sound like you really know what you are talking about.  Instead of just telling people to forget it, you will point out the difficulties, and frequently give advice on how to over come the challenge.  This lends to your credibility.  Unfortunately, I, like most, have become very skeptical over the years, so I will withhold judgment until I see something tangible.  I am particularly interested in seeing your MiniMig external bus.  It would be great to add another name to list of people who have delivered on the MiniMig.


If you'd like I could post the schematics now, it's getting the PCB bits done that I drag my feet on.
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