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TE AMP 1-1734530-1 female VGA connectorTE AMP
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Ceramic Capacitor, 0.1uF, 0805 |
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Through-hole 150Ω resistorYageo
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KiCADKicad
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NEC PC-8801mkII digital RGB video to VGA adapter
When I bought an NEC PC-8801mkII computer from Japan a few years ago, one of the big problems that I ran into was a lack of video cables. Not only does the PC-8801mkII use an uncommon 8-pin DIN video connector, but it sends digital RGB video (1 bit per channel) at TTL levels and a 15 or 24kHz horizontal sync, which most monitors cannot handle.
This adapter was developed as part of a project for the leaded solder blog. You can see my blog posts about its development at these two links:
- Part 1, a mystical journey to PC88 colour video, covers my initial development of the board.
- Part 2, the last ride of PC88 colour video, covers my changes to fix the backwards pinout.
I decided that I would adapt the "8-pin DIN" problem first. Using this adapter, I could connect the PC-8801mkII to a 24kHz-capable VGA monitor (in my case, an NEC MultiSync 1970NX LCD) and finally view colour video on the system:
This adapter has been serving me well for years, and I have since found out that the pinout is also shared with several other Japanese computers, including the Fujitsu FM-7, NEC PC-6001mkII, and NEC PC-9801UV.
In 2021, I added decoupling caps to the design in order to reduce the incidence of "jailbars" in the output video signal.
NEC PC-8801mkII digital RGB video to VGA adapter
*PCBWay community is a shared platform and we are not responsible for any design issues.
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thegirlg33k Dec 21,2021
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