[comp.sys.atari.st] Hooking up a MONO monitor

st.chairman@canremote.uucp (ST CHAIRMAN) (12/13/89)

 Recently I been wondering about hooking up a MONO monitor to my ATARI
ST system, since I have only the ATARI SC1224 (Color) monitor. --- I
know I can run out and buy a ATARI SM124 (Mono) monitor and hook it up,
but I have been wondering since I own many other monitors for my
different computers, if there was a way to hook up a monitor like a TTL
one on a IBM. ---- Since I knew a lot about electronics I decided to try 
a hook up to the TTL IBM monitor I have, but all I got was a black
screen. ---- Looking at the wiring I could not see why it didn't work,
unless the SYNC levels are not matched to the TTL type. ---- Does anyone 
out there know how to hook up a third-party monitor to the ATARI ST?
 
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    / //    MTST Metro Toronto ST User Group Librarian
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greg.trice@canremote.uucp (GREG TRICE) (12/13/89)

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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