UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Connecting BBC B to VGA Flatscreen Monitor.

neon indicator · 25th Apr 2011, 10:57 pm

Most Multisync monitors do 480p minimum, not the 576i needed for BBC RGB or Composite, as that's about 1/2 the line frequency.

You can use a suitable cable for Amiga, Atari, Acorn, BBC to SCART (RGB or Composite) and B&W on S-Video (sometimes colour with Composite to S-Video adaptor).

"multisync" usually referred to ability to do VGA (about 32kHz Line rate as it's progressive 60Hz) and SVGA (About 40kHz). Some could do EGA and CGA also (all progressive 60Hz) Some did 1024 x 768i 43Hz, which is Interlace, not progressive, but about same line rate (about 33kHz) as VGA

AFAIK all BBC machines did 625 line (i.e. 576i, 15.625KHz line rate) so won't work with most "multisync" at all, even if you interface the LM1881 to VGA H & V and tie RGB together to get white.

25th Apr 2011, 10:57 pm	#14
neon indicator Retired Dormant Member Join Date: Jun 2010 Location: Co. Limerick, Ireland. Posts: 1,183	Re: Connecting BBC B to VGA Flatscreen Monitor. Most Multisync monitors do 480p minimum, not the 576i needed for BBC RGB or Composite, as that's about 1/2 the line frequency. You can use a suitable cable for Amiga, Atari, Acorn, BBC to SCART (RGB or Composite) and B&W on S-Video (sometimes colour with Composite to S-Video adaptor). "multisync" usually referred to ability to do VGA (about 32kHz Line rate as it's progressive 60Hz) and SVGA (About 40kHz). Some could do EGA and CGA also (all progressive 60Hz) Some did 1024 x 768i 43Hz, which is Interlace, not progressive, but about same line rate (about 33kHz) as VGA AFAIK all BBC machines did 625 line (i.e. 576i, 15.625KHz line rate) so won't work with most "multisync" at all, even if you interface the LM1881 to VGA H & V and tie RGB together to get white.