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Re: Superboard Colour RGB and composite interface

Posted: Fri Jun 07, 2019 4:45 am
by Steve Gray
Ok, so the board is almost complete. I decided to go with the RGBI mode only and not emulate OSI mode. I also added a configuration header for selecting sync, a "Gonbes Out" connector, and power output. There's one final double-check to do before sending the boards out.

I have created a project webpage with information and schematics etc here:

http://6502.org/users/sjgray/projects/osi-600d-colour/

Comments and feedback are appreciated. I will update the page when board is sent out and when it arrives.

Steve

Re: Superboard Colour RGB and composite interface

Posted: Tue Jun 11, 2019 8:33 pm
by Steve Gray
I had to fix the RGB output header.. I had it backwards...

The boards have been sent off to DirtyPCBs.com. I have ordered 12 for the first batch. They will be coming on the slow boat from china so I expect them in about 3-4 weeks.

Steve

Re: Superboard Colour RGB and composite interface

Posted: Wed Jun 12, 2019 6:21 pm
by Steve Gray
So, here's a picture of the breadboard version with the colour write jumper fix.
FixedColorWriting.jpg
FixedColorWriting.jpg (345.66 KiB) Viewed 1497 times
The colour looks much sharper than it appears from my phone's camera.

Boards were in production today.

Steve

Re: Superboard Colour RGB and composite interface

Posted: Wed Jun 12, 2019 7:18 pm
by dave
Beautiful!

Re: Superboard Colour RGB and composite interface

Posted: Fri Jun 14, 2019 12:55 am
by Steve Gray
Been writing some demo software....

Here is a colour chart for 48-column mode:
colour-chart-48-sm.jpg
colour-chart-48-sm.jpg (270.92 KiB) Viewed 1479 times
oops, I see a typo..

Re: Superboard Colour RGB and composite interface

Posted: Fri Jun 14, 2019 5:50 pm
by Steve Gray
Just a note about the above.. my breadboard is connected via an Amiga SCART cable which has its own resistors on the rgb lines, so the colours you see above are not optimized. The optimal values for the final pcb will need to be determined so that the normal and intense colours are more distinct.

Steve

Re: Superboard Colour RGB and composite interface

Posted: Thu Jun 27, 2019 3:42 am
by Mark
WinOSI is getting Steve's C1E RGB upgrade as well!
image.gif
image.gif (10.75 KiB) Viewed 1309 times

Re: Superboard Colour RGB and composite interface

Posted: Thu Jun 27, 2019 4:24 am
by Steve Gray
Nice! Can't wait. Will we be able to emulate the RGB upgrade BEFORE the boards actually arrive? ;-)

Steve

Re: Superboard Colour RGB and composite interface

Posted: Wed Jul 24, 2019 3:26 am
by Steve Gray
The Colour boards arrived today. I will be building one or two this week.

Steve

Re: Superboard Colour RGB and composite interface

Posted: Wed Jul 31, 2019 1:02 am
by Scott Larson
I always wondered how OSI did NTSC color. It looks like the circuit relies on the slight delay of a 7404 to jab the subcarrier at the right phase to produce a color. That can't possibly work.