Re: Mac to VGA Adapter Question

[a_specto@alcor.concordia.ca (Mitchell Spector)]

 "Bryan Parkoff" <BParkoff@satx.rr.com> wrote:

>"Mitchell Spector" <a_specto@alcor.concordia.ca> wrote in message
>>     There is a _rare_ exception where these Mac-to-VGA adapters can
>> be used on the IIgs. That is if the monitor supports lower horizontal scan
>> frequencies in addition to standard VGA frequencies. A handful of older
>> VGA monitors could drop down to 15.75 kHz (NTSC scan rate) but they
>> were unusual a decade ago and don't at all exist today--at least to the
>> best of my knowledge.
>>
>    My monitor is Sony Multiscan W900.  It does have NTSC switch.  I believe
>that it supports least 30.0KHz.  I don't know if it has 15KHz.

    If it indeed has a switch for "NTSC mode", that implies 15.75 kHz/horz.
That doesn't seem to be the case though, looking at the data sheet for 
the Sony GDM-W900 (its range is 30 to 96 kHz). Is this your monitor..?

http://www.ita.sel.sony.com/support/displays/legacy/specs/gdmw900.html

>Now, you
>mentioned that there is rare adapter that allows to cause Sony Multiscan
>W900 to accept 15KHz using Sony's NTSC switch.  Please advise.

    The adapter isn't rare, it's a dual VGA/NTSC *monitor* that's rare.
These Mac-to-VGA adapters usually come in the box with current
day monitors, and most companies will ship you one free if yours
didn't include one (Viewsonic does, or at least used to, provided
you purchased one of their monitors).

    It's basically a pin adapter with DIP switches, though I'm fairly
sure the IIgs ignore the DIP settings. You need a monitor that
supports NTSC rates. The Sony CPD-1302 is one such monitor.

Mitchell Spector
a_specto@alcor.concordia.ca