Advice needed for Mac2VGA adapter

[MacSE/30]

Hi,

I have a Mac IIvi and want to use a VGA/SVGA monitor with it. I have Rasterops Mac2VGA adapter. It has switches on it. Both 640 x 480 (VGA) and 832 x 624 (This is not SVGA and donno what it is?) do not work. My monitor has horizontal 31.5 to 38 kHz and vertical 50 to 90 Hz scan frequency. I guess Rasterops adapter has a fixed frequency and does not fall into these frequencies.

There are lots of Mac2VGA adapters on ebay. I want one that works in VGA and SVGA mode.

Can you guys recommend a Mac2VGA adapter?

Thanks.

 

[register]

The best commercial available adaptor i have seen has a shielded metal housing with a shielding lid over the DIP switches and all information for proper configuration printed onto it. I do not know the manufacturer, but if you have a choice take one that meets this description.

In case you are skilled to make your own adaptor, get the appropriate information on this web page:

http://www.fortunecity.de/wolkenkratzer/486/60/15pvgaada.htm

Sense pin codes are given there, too, so you can configure the adaptor to allow for the resolution of your choice. Do this only if you are used to this kind of fixes.

 

[MacSE/30]

The best commercial available adaptor i have seen has a shielded metal housing with a shielding lid over the DIP switches and all information for proper configuration printed onto it. I do not know the manufacturer, but if you have a choice take one that meets this description.
In case you are skilled to make your own adaptor, get the appropriate information on this web page:

http://www.fortunecity.de/wolkenkratzer/486/60/15pvgaada.htm

Sense pin codes are given there, too, so you can configure the adaptor to allow for the resolution of your choice. Do this only if you are used to this kind of fixes.

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=120165446662

Are you talking about the one on the left. It's from viewsonic. I have one of that but currently unable to find it. Anyway it does not do 800 x 600. It does 832 x 624 whatever it is.

 

[Gil]

This is what I have:

LINK

Works great, no complaints. Got it for 99 cents on ebay.

 

[Forrest]

According to this link http://docs.info.apple.com/article.html?artnum=112195, the IIvi can only do 512 x 384 or 640 x 480. Your monitor also needs to support a refresh rate of 67 Hz - which was the old Mac standard.

 

[MacSE/30]

This is what I have:
LINK

Works great, no complaints. Got it for 99 cents on ebay.

I saw those on ebay. Can you get an 800 x 600 resolution to a SVGA monitor with that?

The thing that I do not understand is this 832 x 624 resolution. Is there such VGA monitor? VGA is 640 x 480 and SVGA is 800 x 600. Anybody has an idea about this resulution?

 

[~tl]

The thing that I do not understand is this 832 x 624 resolution. Is there such VGA monitor? VGA is 640 x 480 and SVGA is 800 x 600. Anybody has an idea about this resulution?

832x624 was common for Apple's monitors... not sure why it was chosen over the standard 800x600 though. Another one of Apple's quirky, non-industry-standard, decisions I guess!

 

[MacSE/30]

According to this link http://docs.info.apple.com/article.html?artnum=112195, the IIvi can only do 512 x 384 or 640 x 480. Your monitor also needs to support a refresh rate of 67 Hz - which was the old Mac standard.

With rasterops adapter I cannot get 640 480 resolution in my VGA monitor eventhough monitor supports 67 Hz.

 

[Gil]

This is what I have:
LINK

Works great, no complaints. Got it for 99 cents on ebay.

I saw those on ebay. Can you get an 800 x 600 resolution to a SVGA monitor with that?

The thing that I do not understand is this 832 x 624 resolution. Is there such VGA monitor? VGA is 640 x 480 and SVGA is 800 x 600. Anybody has an idea about this resulution?

I believe so, but I haven't tried. I use it at the max resolution.

 

[MacSE/30]

The thing that I do not understand is this 832 x 624 resolution. Is there such VGA monitor? VGA is 640 x 480 and SVGA is 800 x 600. Anybody has an idea about this resulution?

832x624 was common for Apple's monitors... not sure why it was chosen over the standard 800x600 though. Another one of Apple's quirky, non-industry-standard, decisions I guess!

Why would an Apple monitor needs a VGA adapter to work with an Apple or Macintosh computer?

I do not think 832 x 624 is an Apple standard.

:?:

 

[MacSE/30]

According to this link http://docs.info.apple.com/article.html?artnum=112195, the IIvi can only do 512 x 384 or 640 x 480. Your monitor also needs to support a refresh rate of 67 Hz - which was the old Mac standard.

Neither IIvi nor Q650 does not give 640 x 480 output with the rasterops adapter.

 

[trag]

The thing that I do not understand is this 832 x 624 resolution. Is there such VGA monitor? VGA is 640 x 480 and SVGA is 800 x 600. Anybody has an idea about this resulution?

832x624 was common for Apple's monitors... not sure why it was chosen over the standard 800x600 though. Another one of Apple's quirky, non-industry-standard, decisions I guess!

Apple was all about WYSIWYG. They chose their monitor resolutions so that there would be 72 dots per inch of screen real estate. 832 X 624 probably better matches 72 dpi on a 16" monitor than 800 X 600 does. Doing the math, I get a screen diagonal of 14.4" for 832 X 624 at 72 dpi. That is probably close to what 16" (AKA 17") CRTs actually delivered.

I liked that old philosophy much better than the current one of squeezing 1600 X 1200 dots into a 22" screen. Blech, who can read that after the age of 40?

 

[trag]

Why would an Apple monitor needs a VGA adapter to work with an Apple or Macintosh computer?
I do not think 832 x 624 is an Apple standard.

:?:

Heh. The Apple 16" Color Display does not work at any other resolution except 832 X 624. That was Apple's standard for 16"/17" displays.

The Apple 16" Color Display was the one with the big base that had what amounted to an ADB hub built in. It also had jacks to repeat the microphone input and speaker output.

The Apple 17" Multi Scan Display followed. It had the same base, but also supported other resolutions.

 

[Aoresteen]

AFAICR, I've used 832x624 with SVGA monitors flat screen 15". The screen flickers a bit then locks on and works just fine. I never use 640 x 480 if I can avoid it.

I was using a Viewsonic or Sony VGA adapter with my Quadra 605.

In fact, I don't have an Apple monitor. All my monitors are VGA\SVGA\XGA PC types - mostly flat screens now. I can get 1024 x768 with my PM6500 and my G3 B&W.

 

[register]

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=120165446662

The one I recommended is the one on the right hand side in the picture (red sticker).