debs3759 wrote on 2021-06-20, 03:00:
Thanks. Guess I need to find an affordable MDA monitor then.
If it is just about testing MDA and CGA cards, and not about period-correct retro operation of that systems, getting a converter like the MCE2VGA or the OSSC might be an easier way that also occupies less space in your home.
On the other hand, if you want to seriously use an MDA or Hercules(-like) card on a CRT monitor, i strongly recommend you getting an original MDA-type or Hercules-type monitor, not a multi-sync one. The refresh rate of MDA/Hercules is 50 Hertz, and on CRTs it's only acceptable if you have a screen with medium-persistence phosphor. Most color monitors (even CGA/MDA/EGA/Super-EGA multi-sync ones that properly sync to MDA) have short-persistence type phosphor which eliminates ghosting, but causes unacceptable flicker with 50 Hz refresh rate.
Side-note: long-persistence type phosphor is used on radar tubes or other displays that update in the range of once a second, and is generally not used in monitor applications.