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Home Forums 68kMLA VGA on Compact CRT? — #5
Post #5 by Bunsen
Source Forum68kMLA
CategoryHardware
Post DateSat, 28 Nov 2009 - 20:45
Original URLhttps://68kmla.org/bb/threads/vga-on-compact-crt.19126/
Post
TV may be more viable than VGA, it seems. Although a roughly equal amount of hacking would be involved, most of the components will be subject to a lower frequency, from the figures above.

The trick is that TV signals are interlaced, thus only displaying half the number of lines per field. So a PAL field is only 288 lines, and thus the vertical scan rate is lower than that of a compact. By good fortune, the horizontal scan rate is lower as well.

Interlacing could be achieved by slightly bumping or lowering the vertical deflection on alternating fields.

mp.ls