MicroVitec M1438S in combination with VGAOnly

Firestone · 28 May 2020, 21:42

I have always uses either Super72: Super Highres Laced or DBLPal: Highres no Flicker with my A1200 with M1438.

Today I have been experimenting with different monitor-drivers with this monitor to see if i was able to fill the left and right borders im cobination with VGAOnly installed and using 31Khz-modes.

I am aware that it's possible to fill the screen with for example PAL:Highres.

But these 1438-monitors... were they not able to fill the screen back in the days even when they were connected to a PC? For example with 640x480 or 800x600?

The closest I can find is Multiscan: Productivity
With overscan I can reach 656 x 495, and there are still black borders on the left and right side.

The reason that I'm trying to use 31Khz-modes is that I feel that the picture is more stable and a bit lighter.
The strange thing is that on 1438, the grey Workbench-color seem to me like they are a little bit greenish for some reason. I can remember that from the old days too.
I got two of them, one Amiga-brandet and one MicroVitec, and they both show the same result.
Compared to Commodore 1942 the colors on the 1942 seems to be much more accurate.

Please refresh my memory!

DDNI · 28 May 2020, 22:58

I have one of these in storage. Will dig it out and tinker over the weekend.
It needs recapped though as the picture rolls and whines a bit. Do you know of a BOM and instructions for those?

Firestone · 28 May 2020, 23:07

Thanks!
No I'm sorry. Maybe this will help? : http://stardot.org.uk/mirrors/www.bb...20Monitors.pdf

robinsonb5 · 28 May 2020, 23:45

The VGAOnly driver does reduce how much of the screen you can fill in multiscan modes - I found with my 1438 the best results came from DblNTSC without VGAOnly installed - but no, you can't completely fill the borders. The best you can do is use an overscan hack and MonEd - there are various options on Aminet. (I think some of them work better on KS3.0 than 3.1, though - I'm sure on my A4000 back in the day I managed to get Video overscan (something like 768 x 450) DblNTSC on Workbench. The trade-off was that horizontal autoscrolling no longer worked.

Firestone · 29 May 2020, 00:17

Thanks a lot robinsonb5, I'll check a few setups with VGAOnly disabled and using DblNTSC.

28 May 2020, 21:42	#1
Firestone Registered User Join Date: Apr 2013 Location: Norway Posts: 249	MicroVitec M1438S in combination with VGAOnly I have always uses either Super72: Super Highres Laced or DBLPal: Highres no Flicker with my A1200 with M1438. Today I have been experimenting with different monitor-drivers with this monitor to see if i was able to fill the left and right borders im cobination with VGAOnly installed and using 31Khz-modes. I am aware that it's possible to fill the screen with for example PAL:Highres. But these 1438-monitors... were they not able to fill the screen back in the days even when they were connected to a PC? For example with 640x480 or 800x600? The closest I can find is Multiscan: Productivity With overscan I can reach 656 x 495, and there are still black borders on the left and right side. The reason that I'm trying to use 31Khz-modes is that I feel that the picture is more stable and a bit lighter. The strange thing is that on 1438, the grey Workbench-color seem to me like they are a little bit greenish for some reason. I can remember that from the old days too. I got two of them, one Amiga-brandet and one MicroVitec, and they both show the same result. Compared to Commodore 1942 the colors on the 1942 seems to be much more accurate. Please refresh my memory!

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28 May 2020, 22:58	#2
DDNI Targ Explorer Join Date: Mar 2006 Location: Northern Ireland Posts: 5,431	I have one of these in storage. Will dig it out and tinker over the weekend. It needs recapped though as the picture rolls and whines a bit. Do you know of a BOM and instructions for those?

28 May 2020, 23:07	#3
Firestone Registered User Join Date: Apr 2013 Location: Norway Posts: 249	Thanks! No I'm sorry. Maybe this will help? : http://stardot.org.uk/mirrors/www.bb...20Monitors.pdf

28 May 2020, 23:45	#4
robinsonb5 Registered User Join Date: Mar 2012 Location: Norfolk, UK Posts: 1,153	The VGAOnly driver does reduce how much of the screen you can fill in multiscan modes - I found with my 1438 the best results came from DblNTSC without VGAOnly installed - but no, you can't completely fill the borders. The best you can do is use an overscan hack and MonEd - there are various options on Aminet. (I think some of them work better on KS3.0 than 3.1, though - I'm sure on my A4000 back in the day I managed to get Video overscan (something like 768 x 450) DblNTSC on Workbench. The trade-off was that horizontal autoscrolling no longer worked.

29 May 2020, 00:17	#5
Firestone Registered User Join Date: Apr 2013 Location: Norway Posts: 249	Thanks a lot robinsonb5, I'll check a few setups with VGAOnly disabled and using DblNTSC.

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