Seeking an ECL monitor (preferably for a dimple-top Sun base) and Sun 3 Keyboard and Mouse

On 27 Jan 2015, at 20:15, Ian Finder <ian.finder at gmail.com> wrote: The Sun mono monitor has a DB9 input, so this is probably a monitor for a CG3/ CG6 SPARC SBus card (there was also a bwtwo SBus card which provided ECL output IIRC). It's hard to find a picture of this monitor, I think this one from Wikipedia is the BNC type greyscale monitor: http://en.wikipedia.org/wiki/SPARCstation_10#mediaviewer/File:Sun_SparcStat… However, it's strange that the monitor has two BNC inputs - the grayscale monitor was usually driven by the Sync-on-Green signal, so it should require only one BNC connector. However, I haven't seen a Sun grayscale monitor in almost two decades. The hardware FAQ doesn't mention the frequencies accepted by the grayscale monitor. But I think it supports the same as the color monitor, since the grayscale simply uses the green (+sync-on-green) signal instead of RGB. The standard 1152x900 resolution ECL monitor's frequencies are 61.8 kHz horizontal and 66 Hz vertical. The color screen also supports a 61.8 kHz/ 66 Hz mode, so the frequencies seem to be compatible. Assuming the ECL-to-TTL converter solution works (will try in two weeks when I'm back in Germany), generating the analog grayscale signal should be a matter of reducing the signal voltage (1 Vpp instead of 5 V) and mixing in the H/V sync signals. This circuit by Tomi Engdahl might be a starting point (the first one it mixes the sync signals): http://en664r.blogspot.co.uk Mixing this to a sync-on-green signal is described here: http://www.epanorama.net/circuits/sync_r.html (if sync-on-green works with the monitor). Beware - I have tried none of these circuits, so checking the voltages and frequencies at the output before connecting a monitor is highly recommended... Hope that helps... -- Michael