NEC computor help

[Timberland]

I ned help ,my machine uses an RGB 8 pin monitor plug and I need to convert to an vga. My monitor is going out of clarity and I can't see the image real well. It uses an PC-8091K cable
Thanks

 

[rjenkinsgb]

my machine uses an RGB 8 pin monitor plug

I'm not familiar with an 8 pin video connector?

Edit - looked up the NEC info, and a bit of searching shows that it's almost VGA compatible, signal-wise.

Info here (use google translate):

デジタルRGB(8ピン）はアナログRGBの夢を見れるか？ - おいらの趣味（興味）

皆様、こんにちは。 さて、昨日のPC-9801-15（1MB FDD I/F)は正常に稼働し、PC-9801FでDOSが起動しました。 DOSはこれ。 結果はこれ。 コンポジットモノクロ出力(640x200）でTVに映しているので見辛いです...

web.archive.org

8 pin DIN connector layout shown here:

A mystical journey to PC8801mkII colour video

I’ve been using the monochrome video cable on my PC88 ever since I built it. Colour video was a little more complicated, so I ended up designing a bunch of adapters to try and get it to work. I’m happy to announce that one of those adapters has finally worked!

www.leadedsolder.com

It's pretty much pin-to-pin by name for the VGA signals, but with 150 Ohm resistors added in series with the RGB lines to reduce the signal levels.

 

[ramondo]

You mention clarity,,, Is this a CRT monitor and have you checked for a focus adjustment. If the monitor is "well used" then maybe you could increase heater supply voltage with a step up transformer or take one heater wire and wrap around flyback core to increase voltage.