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#1 04-07-2014 15:25:38

cdesp
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Location:  : Kilkis, Macedonia, Greece
Registered: 27-07-2008
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Video Circuits - Monochrome Composite

These are the schematics for the CPLDs i am using to produce the video signal.
Also the Character ROM interface.
XC9572 is producing the HSYNC,VSYNC, and PIXEL CLOCK.
XC95108 has the logic to read bytes from RAM select text or graph mode and of course output the pixels
to an AD724 chip which along with HSync and VSync is producing the Composite signal.

http://www.newbrainemu.eu/components/com_agora/img/members/6/VideoBrd.jpg

This image has been resized, click here to view the full-sized image.




These are general use boards for XC9572 or XC9536 and for the 84pin XC95108
http://www.newbrainemu.eu/components/com_agora/img/members/6/plcc44-adaptor-v2-dsn.jpg

This image has been resized, click here to view the full-sized image.

http://www.newbrainemu.eu/components/com_agora/img/members/6/PLCC44-Adaptor-v2.jpg

This image has been resized, click here to view the full-sized image.



On this board i had to connect manually the TCK PIN
http://www.newbrainemu.eu/components/com_agora/img/members/6/PLCC84-Adaptor.jpg

This image has been resized, click here to view the full-sized image.

 


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