"Peter L. Peres" <plp@ACTCOM.CO.IL> wrote:
> 1.8432 MHz This sounds weird but it is 3.57 MHz / 2 (NTSC color carrier).

No, it isn't.  1.8432, 3.6864, and 18.432 MHz are all routinely used because
they conveniently divide down to common baud rates.  They have no
particularly good relationship to television scan rates or color carrier
frequencies (either NTSC or PAL).