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PostPosted: Mon Nov 19, 2018 9:10 pm 
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Joined: Mon May 25, 2015 2:25 pm
Posts: 693
Location: Gillies, Ontario, Canada
That would be fun for sure.

The intersting thing is that even the Vulcan-74 board fully running only required 300mA to operate!
I was actually running it right off the +5V on the VIC-20 Cart port.

I have a large box full of brand new LM323 VRegs as well (VIC-20 style) , so I might as well use them.
No doubt, that beefy 3 amp monster will stay 100% cool since JetPack is 100% CMOS tech.

Brad



mojo wrote:
You could just build a switch mode power supply... Or even a linear one, but using discrete components.

Back in the day efficient switch mode PSUs were possible, just not common due to cost.


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PostPosted: Wed Nov 21, 2018 5:15 pm 
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Joined: Mon May 25, 2015 2:25 pm
Posts: 693
Location: Gillies, Ontario, Canada
Here is the final IO Buffer and Expansion RAM schematic.

Image

Viewable size...

http://lucidscience.com/temp/jpsch-io-nov18l.png

I have been picking away at the Video Generator now the VIC and MOAB get along.
Will have some photos and a video to show off on my next free Sunday hacking day.

Funny thing about the Video Generator... I have to build it completely in order to test it.
All counters, comparators, memory, sync logic, DAC, mixer, etc.


Brad


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