Video Scaler for MDA, CGA, EGA to VGA Adapter Toshiba T1000 Amstrad PPC640-Built
£27.95
It should auto switch to MDA or EGA if connected, and pressing the auto button should centre it. but I'm unable to test that as my units only have CGA output, which works great. You could then connect to a VGA to HDMI + HDMI to USB.
