monitor tweaking

Chuck Guzis cclist at
Tue Nov 29 11:06:46 CST 2005

On 11/28/2005 at 6:48 AM Chris M wrote:

>to what extent is it advisable to use a say ~350 line
>monitor with a 400 line video output? 

It depends on the construction of the monitor.  Most should be able to
survive the increase in horizontal frequency.  

When the PC was still young, there were quite a few machines around with
Hercules -compatible mono displays that wouldn't run CGA games.  I came up
with a program called SIMCGA that used a small timer-driven TSR to
duplicate every other line of the CGA display on the HGA screen.  It was
necessary to tweak the scan frequencies a bit to get things to work, but we
found that most monitors put up with it just fine.


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