[Coco] FM-77AV video sync problems

[Bob Devries]

Searching the web shows that Japan in fact uses both 50 and 60 Hz @ 100VAC.

http://en.wikipedia.org/wiki/List_of_countries_with_mains_power_plugs,_voltages_and_frequencies


This being the case, it could well be that the FM-77AV is set for 50HZ 
operation. This would definitely cause serious rolling of the picture if 
used with a 60HZ monitor.

This is the problem we Aussies faced when OS9 Level 2 came out. The GIME was 
programmed for 60HZ operation in the boot, and when used on a TV that did 
not have any H & V adjustments, it was very difficult indeed to get it to 
work right. Even when using the CM-8 monitor, the Horizontal and Vertical 
adjustments were all over to one end of the potentiometer range.

--
Regards, Bob Devries, Dalby, Queensland, Australia

Isaiah 50:4 The sovereign Lord has given me
the capacity to be his spokesman,
so that I know how to help the weary.

website: http://www.home.gil.com.au/~bdevasl
my blog: http://bdevries.invigorated.org/

----- Original Message ----- 
From: <KnudsenMJ at aol.com>
To: <coco at maltedmedia.com>
Sent: Wednesday, April 12, 2006 11:08 AM
Subject: Re: [Coco] FM-77AV video sync problems


>
> In a message dated 4/9/06 3:53:28 PM Eastern Daylight Time,
> linville at tuxdriver.com writes:
>
>>I  suppose this could be a 50/60Hz issue...?  What is the power  cycle
>>rate in Japan?
>
>
>
> Pretty sure Japan is 60 Hz, same as North America.  But you're right,  the
> voltage is lower, nominally 100V to our 117.
>
> When you play with the sync hold knobs on the monitor(s), is one extreme
> rolling slower (ie, closer to sync) than the other extreme?  It sounds 
> like  your
> horiz sync is OK, it's the vertical.
> Maybe the sync pulse polarity is wrong, but then, you should be able to
> "stall" the image in the center for a few seconds with the Vert Hold knob.
> --Mike K.
>
>
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