Reply To: Amstrad Mega PC with OSSC

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i’m having similar difficulties trying to get it to work with a 15khz RGB monitor – the Sony KX14CP1

So i’m taking the signals direct off the MegaPC board RGBHV

My monitor expects TTL level and i suspect this is the issue.

Looking at the MegaPc Service manual the RGBHV goes to the monitor where there is a Toshiba TA8631 RGB Chip but before the inputs there are 75ohm pull down resistors and an ‘in-line’ capacitor 47uf.

on the TA8631 datasheet it recommmends 51ohm pull downs.

I think i need to pull down the lines and also connect the grounds.

This may help you