🚀 go-pugleaf

There is no problem in hooking up any monitor - providing it has a 
horizontal scan frequency of 35.7kHz. The IBM one is nowhere near this, 
nor are most cheap mono monitors. They are available, but won't be very 
cheap; at least as much as a genuine Atari one. If you have some 
electronics knowledge you can modify a monitor to work on the new 
frequency, but it's a fairly extensive modification and I wouldn't do it
on one you've just bought. Alternatively you might prefer to design your
own and build it from scratch if you like that sort of thing. Mono 
monitor circuitry is pretty rudimentary and quite fun to play with. But 
if you just want to use it - buy an SM124!
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