[rescue] VGA Scan Conversion

J. Alexander Jacocks jjacocks at mac.com
Thu Aug 18 15:17:16 CDT 2011

On Thu, Aug 18, 2011 at 4:11 PM, Nate Raymond <nraymond at gmail.com> wrote:
> On Thu, Aug 18, 2011 at 4:04 PM, J. Alexander Jacocks
<jjacocks at mac.com>wrote:
>> I have a Dell 2001fp, which, though an otherwise excellent LCD (IPS
>> panel, lots of inputs, etc.), claims to be multisync, but is not.  The
>> specs are:
>> Horizontal scan range   31 kHz to 80 kHz (automatic)
>> Vertical scan range     56 Hz to 76 Hz, exception 1600 x 1200 at 60 Hz
>> (from http://support.dell.com/support/edocs/monitors/2001fp/EN/specs.htm)
>> But, I have found that it will not do 640x480 at 66 or 640x480 at 75, which
>> are within it's supposed range.  I've found the same on several other
>> LCDs that I own.
> Are you sure it's not because the Dell 2001fp lacks sync on green?  Early
> macs didn't have composite sync, they did sync on green, and some monitors
> (like that NEC mentioned and quite often ViewSonic) support both composite
> sync and sync on green, while Dell monitors don't support sync on green
> (that I know of).


No, the Dell LCDs that I have (2001fp, 2405fpw) both support SoG, as
demonstrated by connecting them to my DEC 3000/400 AXP, which requires

Good thought, though.

- Alex

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