AT&T 6300 mono monitor

From: Chuck Guzis <cclist at sydex.com> On 12/23/2012 05:29 PM, Chris Tofu wrote: So you have a 6300 or M24 that you've used the Eagle 5151 clone with? I'm surprised that it worked. The 6300 outputs a 640x400 display, so the frequencies are actually closer to VGA than monochrome.? (about 30KHz horizontal/60Hz vertical, if memory serves).? IBM hi-res CGA mode was emulated by doubling each horizontal line. C: a VGA horizontal scan rate is 31.5 khz. Off the top of my head I don't know what a 5151s is, about 22-23 khz allowing for overscan. A Tandy 2000 or AT & T 6300s is about 25 khz. A vga has 480 lines of resolution (although there is that 400 line mode, which could possibly mean vga monitors are dual frequency. Anyone?). 400 is closer to 348 then 480. I've used a 6300 with an Acer AL1916W display with very nice results. It's not monochrome, but it's very sharp. C: I'm sure you're relating your success w/that monitor accurately, but is it a multiscanner? I can't even understand how a ttl video signal is compatible w/a monitor that expects 1 volt peak to peak rms. You can, using jumpers (and removing a PAL on some versions) disable the inboard video and add an EGA or VGA card.? I'm not aware that the BIOS has any support for a standard MDA card.? The 6300 is odd in that the video card also serves to couple the motherboard to the bus converter board, so it can't simply be removed. I think it'd probably toast a 5151 display. ?C: I'm at a loss to understand why you think that. And no I've never plugged anything foreign into a 6300, but a ttl monitor seems the natural choice.