I'm pretty sure the A1200 spits out a 15khz signal by default, requiring a 1084 or equivalent monitor.
It does but if you use the VGAonly driver it will display flicker-free on a VGA monitor with only a simple adapter. If you want to run games that hit the hardware directly and run in NTSC/PAL modes then you need a scandoubler to display them on a VGA monitor.
You can get an internal scan doubler for the A1200 at
Software Hut but it isn't cheap. It'll cost you as much as the A1200 or a used monitor.
