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Post by Pyrofer on Sept 27, 2016 15:26:47 GMT
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Post by eslapion on Sept 28, 2016 15:10:13 GMT
I looked at the adapter and I suppose it provides much better results than ordinary resistor and diode solutions.
Something I don't get, however, is why you use an antiquated and expensive solution like the GAL22V10. It's an expensive chip, consume lots of power, big footprint.
Why not a lightweight chip like the XC9536XL like we use for PLAnkton? There are also many low cost/low power CPLDs from many other manufacturers.
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Post by Pyrofer on Sept 29, 2016 14:51:46 GMT
The datasheet said it was low power! It's a 5v native chip. It's got a footprint that I can hand solder. I had some GALs available when I was designing the board.
If the part you have fits the bill, why go out of your way to find a replacement? I get your point. In the future I will probably look into using more modern easily available chips but it's very much a case of just getting the job done with the parts and skills available.
I actually doubt this will be the final thing I make regarding the C128 VDC output but until I learn to program an FPGA this is the best I could do at the time.
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Post by eslapion on Sept 30, 2016 11:02:57 GMT
@pyrofer FPGAs are certainly overkill with a capacity of thousands of gates (hundreds of...).
However, the GAL22V10 from 4 up to 10$ depending on the speed. The fastest XC9536XL costs 2.50$
Since this is used on a display application with a dot clock of 16MHz, I assume you want a fast response.
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