Back in the day, I got my hands on an old B&W workstation monitor. At the time, it was comparatively large, and very sharp, but it only had a single coax connection on the back, which accepted a signal with embedded timing information. I had to make an adapter with a couple of transistors (to do a timing pulldown) and resistors (to mix the colour channels) and write a custom X display mode line, but it enabled a random old second graphics card to drive it as a second monitor.
Back in the day, I got my hands on an old B&W workstation monitor. At the time, it was comparatively large, and very sharp, but it only had a single coax connection on the back, which accepted a signal with embedded timing information. I had to make an adapter with a couple of transistors (to do a timing pulldown) and resistors (to mix the colour channels) and write a custom X display mode line, but it enabled a random old second graphics card to drive it as a second monitor.