Mark McCague wrote:
> I've a few questions about some Apple/Mac to PC VGA Monitor Adapters I have
> lying around. One is a Unimac 82D, another is the Unimac - fly and the last
> one is unmarked but has 10 dip switches.
>
> 1) Anyone know how the one with 10 dip switches is configured?
Many (if not most of them) of these adapters use the same dip switch
settings. Here are the settings for my Interex (But I don't remember if
it has 10 switches or not.):
------------------------------------------------------------------------------------
Universal Mac Video Adapter I-178a and I-178b
MONITOR
RESOLUTION SETTING
12" RGB 512x348
13467
13" RGB 640x480 66Hz 1467
PORTRAIT
640x870
23467
VGA/SVGA
640x480/800x600 60 Hz 2367
15" TILT N/A
2467
16" COLOR 832x624
1367
19" COLOR 1024x768 1267
21" COLOR 1152x870 123467
2 PG MONO 1152x870 3467
NTSC
N/A 12467
NTSC/PAL
N/A
12367
HI-RES 12-14" up to 640x480 1467
MULTI SCAN 14" up to 832x624 146789
MULTI SCAN 16" up to 1024x768 14679
MULTI SCAN 21" up to 1280x1024 14678
> 3) Whats the difference between seperate sync and sync on green and also
> between c.sync1 and c.synch2?
Your monitor will determine this. If you get a picture, don't mess with
these settings.
> 4) Does it matter which graphics card Mac, or Monitor you run?
Absolutely! Both the graphics card and monitor determine what
resolutions you can use.
> 5) Is there any difference in signal quality between these adapters?
No. These adapters merely replicate the hardware wiring in Apple
Monitors that the Mac uses to determine what monitors they are.
> 6) Does it matter which version of the Classic OS you run 7 through 9 ?
No, other than what's different in the monitor control panel.
> 7) I've tried using the Unimac 82D and the Unimac - Fly on a PC 17" monitor,
> at 832x624. The monitor emits a high pitched sound when used with the
> Unimac - fly but only at this resolution. All other resolutions are fine.
> 1024x768 runs fine for example. Any thoughts why this would be. I assume the
> refresh rates are the same.
A monitor emitting a high pitched whine usually means a failing flyback
transformer or a bad resolution/frequency setting. If it goes away when
you change the resolution, don't use that resolution again...that's not
compatible with that monitor.
Assuming the refresh rates are the same is a BAD idea...they vary a lot.
Many monitors have built-in controls, often they will diosplay the
resolution and frequencies they're set to.
--
Bruce Johnson
University of Arizona
College of Pharmacy
Information Technology Group
Institutions do not have opinions, merely customs
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