Author Topic: ARM CPU + z80 GPUS?  (Read 3128 times)

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Offline sirus20x6Topic starter

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ARM CPU + z80 GPUS?
« on: September 21, 2012, 02:16:09 am »
So I've never ever done anything like this but I have this mad idea




and here is my progress


Front:




Back:



Is this sane/doable? do you think I'll need any glue logic? I picked up a couple of ATF22V10C chips. which is atmels version of a gal22v10 but I don't think I'll have to use them.

I've got to figure out chip select on the z80 side the video dac I have is a ADV7125 and that feeds a ad723aruz which is what the uzebox uses.
« Last Edit: September 21, 2012, 02:36:47 am by sirus20x6 »
 

Offline poptones

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Re: ARM CPU + z80 GPUS?
« Reply #1 on: September 21, 2012, 02:26:18 am »
Why?
 

Offline sirus20x6Topic starter

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Re: ARM CPU + z80 GPUS?
« Reply #2 on: September 21, 2012, 02:34:55 am »
for fun? and to learn ARM
 

Offline Zad

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Re: ARM CPU + z80 GPUS?
« Reply #3 on: September 21, 2012, 02:44:46 am »
Well it will be an adventure certainly! Although ARMs are plenty fast enough to bit-bang VGA and analogue video through simple resistive DACs.

Offline sirus20x6Topic starter

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Re: ARM CPU + z80 GPUS?
« Reply #4 on: September 21, 2012, 03:00:59 am »
well i already have a 24bit dac and the video encoder chip. this will get me composite and s-video out.

Anyone have an idea of how to clock all these chips? my ad723 requires 3.58mhz (NTSC frame burst) so the z80s will run at 6 times that for 21.48 and the ARM chip is 50mhz so 14 times 3.58mhz will get me 50.12mhz. I hear these shift registers top out at 25mhz which is perfect.
 


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