[comp.sys.ibm.pc] EGA display -> NTSC analog question

john@uwmacc.UUCP (John Jacobsen) (01/09/87)

This is a question a faculty member at my university has for all you
net.people.  Any information or pointers of any kind would be appreciated.


    We need to display the output from an IBM AT using the IBM EGA
display card on standard NTSC (National Television Standards
Committee) composite video ANALOG monitors.  Although there is an EGA
mode with NTSC compatible sweep-rate, to my knowledge, all the modes are
RGB (Red/Green/Blue) DIGITAL.
    The monitors are existing units installed in several of our lecture
halls and are designed to handle either standard broadcast signals or NTSC
line level video -- analog only.
    Can we do this via some modification to the EGA board, an external
adaptor or is an different video display card the only alternative?
If a new display card is required, what is the best choice to keep as
much compatibility with our other AT's using the standard IBM EGA?


John E. Jacobsen
University of Wisconsin -- Madison Academic Computing Center
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