Connect CMM / CMM2 to 1084s Monitor

Author	Message
Volhout Guru Joined: 05/03/2018 Location: Netherlands Posts: 5994	Posted: 02:25pm 20 Jul 2021       Hi Vampire05, First of all, the 1084 monitor has RGB input that is more or less compatible with the old SCART RGB standard. It is analog, suitable for a 15.625kHz line rate. It has either composite sync in red, or composite sync on a separate connector. The composite sync has 0V level for both HSYNC and VSYNC combined. VGA is different. It has 31kHz or higher line rate, and has separate HSYNC and VSYNC signals. Depending on the VGA resolution, the HSYNC and VSYNC signals are inverted. Technically it is possible to combine HSYNC and VSYNC with some logic to a composite sync signal, but it is not possible to drop the VGA framerate from 31kHz to 15.6kHz, unless you buy a frame rate converter (b.t.w. these are available from China, I used one to play PC movies on my old CTR TV). If you apply 31kHz to an analog monitor or TV it is possible to destroy the monitor since some (non-multisync) monitor run the high voltage generator at the frequency of the line rate to avoid visible noise in the picture. Doubling the frequency (15.6 -> 31kHz) may destroy the high voltage generator. And... as proven before ...Google is your best friend.... You will destroy the 1084S when you connect it to a VGA signal... Edit: the CMM (CMM1) has an analog video mode (composite video) in black and white. That will work with the 1084. But does not provide color. Edited 2021-07-21 00:59 by Volhout