A takky Mac…..

[Trash80toG4]

How'd that work running off an LCIII? The 630 tops out at 800 x 600 SVGA, 832 x 624 16" Mac in 8-bit and the LCIII lacks SVGA?

edit: no board in that form factor supported 1024x768 until the 6360/6400 generation. Does that LCD support 640x480 VGA?

 

[-SE40-]

Hi @Trash80toG4 ….

Thats why I checked, and was curious what it would picture.
Using the adapter dongle I got with the 630, set to 1024x768
I got the image shown, with the LCIII.
Or at least I believe its set to that resolution….will check!
Before repapping the 630 board, I did check its functionality
with this dongle and a dell monitor without a issue.
Maybe the controller with the display scales?
Anyhow, anyways it works, at least with a LCIII.
Pretty sure it will work again with the 630 board lateron
(if cleaned and recapped correctly).

 

[Trash80toG4]

Caffeine deprived WAG would be is that the panel's controller is scaling 640x480 VGA to fill the LCD's 1024x768 XGA field.

If you had the adapter on the 630 it's more than likely set to handle VGA/SVGA at a minimum and VGA would be what you're seeing from the LCIII?

Quick test would be to install GraphicConverter. Create 640x480 and 320x240 pixel colored box images to see what portion of the LCD they cover. 320x240 will likely cover one quarter of the panel. When you have the 320x240 image take it a step further. You can spec the addition of 320 and 240 pixels to put the colored box into one of the corners on a white field in the resulting 640x480 image. With the three images in a folder, you can choose it and run a slide show so each test image displays at full screen in sequence.

Pixel playtime!

 

[retr01]

According to Apple, the LCIII did not support 1024x768 resolution. Note below the resolutions available up to 8-bit (256 colors) or 16-bit (thousands of colors) video based on VRAM. The resolutions shaded in green are provided by the LCIII whereas the resolutions shaded in yellow are not.

So, I am not sure where 1024x768 came from.

 

[Trash80toG4]

It's not.

 

[-SE40-]

Dont shoot me!

I only said that the display and adapter where set at 1024x768, and shown you guys what this display did output.
Just tested this to be sure that this display would be usable after conversion with its new frame. And its looking promissing sofar.

But its good to know the LCIII graphic limitations. Thank you guys for that info.

(edit -630 maybe better?)

 

[Trash80toG4]

You said the VGA Adapter setting was 1024/768, but were going to check that out.

There's almost always one switch setting that covers both 640x480 and 1024x768 @60Hz. There is usually one setting that covers anything thrown at it onto a MultiFreq Display.

edit: can't imagine any other case than the LCD controller scaling 640x480 to fit. Fab little controller board/LCD combo! If it'll scale 16" it's perfect!

 

[-SE40-]

Here are the settings

 

[Trash80toG4]

Cool, but what do they represent according to the manual? Running off to work, so:

Video Adapter Docs Scan Dump

I've tried to collect some prime examples of Mac Video Adapters and Adapter Cables along with the Documentation for them over the past 20 years or so. A question came up about a four DIP Switch adapter, this is the only similar adapter that I've found. The small pamphlet's pages were compiled...

68kmla.org

 

[retr01]

It looks like the DIP switches are set to 3458. I can't find that setting in various DIP charts. Closest I could find was 3456 for a 2-page monochrome at 1152x870 resolution. Hmmm. The LCD monitor must have scaled down to 1024x768. Yet, 1152x870 is not supported by the LCIII.

Hey @-SE40-, did DIP switches set at 3458 when you tested the LCD screen successfully with the LCIII?

 

[-SE40-]

Yes, 630 and LCIII did work with this adaptor.
Never changed it as it did simply function….
Maybe there is a better setting?

 

[mg.man]

Hate to burst the bubble... but I believe you have one of these:

...and if so, the answer is on the other side:

3, 4, 5, 8 = 640x480 I'm afraid.

 

[mg.man]

It'd be worth trying 2, 4, 5, 8 - which is 832×624 = the highest resolution the '630 on-board video supports. See if your panel will sync on that.

 

[Trash80toG4]

That'd be fabulous, but not very likely. If it's scaling 640x480 VGA, it'll likely scale 800x600 SVGA to 1024x768 XGA as well. Running that quarter panel slide show I suggested in GraphicConverter will tell the tale if you set images up for both resolutions.

 

[retr01]

That adapter with a chart ready to refer to on the bottom is very clever. I don't see helpful features like that much anymore. Almost all adapter folks make it so cheap and throw in a small piece of paper with print so small and hard to read.

 

[-SE40-]

Thanks @mg.man , I wasnt in yesterday, so could not check.
So mystery (partly) solved…..

 

[Trash80toG4]

3, 4, 5, 8 = 640x480 I'm afraid.

No fear! That's fabulous, an autoscaling controller/panel combo for the Compact form factor is great news!

 

[mg.man]

I've asked @-SE40- to try the 832x624 switch combo and report back. Will be interesting to see if there some Mac resolution support in his flat panel circuitry - I would not be totally surprised, though the resulting image may not look great!

What's bugging me most, however, is why the '630 doesn't support 1024x768. It supposedly has 1Mb of VRAM, so this should be possible?
Rather than divert this thread, I've posted a parallel one to discuss :

https://tinkerdifferent.com/threads/why-doesnt-the-performa-630-and-friends-support-1024x768.1916/

 

[-SE40-]

@mg.man , thanks for that.
Still have to figure out some cables/connections/PSU
on the 630,….Before I can try….
Was also planning to make a blue scsi boot micro SD for the LCIII to try out disk jockey maybe thats a solution for now?

 

[-SE40-]

tested conform requested setting on the LCIII……..(moire effect is caused by camera BTW)