VGA adapter with Blow Up and VGA/RGB switch

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dhedberg
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Re: VGA adapter with Blow Up and VGA/RGB switch

Postby dhedberg » Mon Jun 10, 2019 1:54 pm

Looks like Chris already have another batch coming up in his store soon:
https://www.exxoshost.co.uk/forum/viewt ... 002#p23000

Please note that I have nothing to do with these adapters any longer. Chris (exxos) is manufacturing them nowadays and is the one to contact for support, etc.

That is, unless you bought one directly from me of course.
Daniel, New Beat - http://newbeat.atari.org. Like demos? Have a look at our new Falcon030 demo and feel the JOY.

jd
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Re: VGA adapter with Blow Up and VGA/RGB switch

Postby jd » Mon Jun 17, 2019 11:01 am

I have now migrated to an older monitor (Sony CPD-M151) and the Falcon + dhedberg's adapter seems alot happier 976x752x16x50Mhz clock . TOS desktop requires a solid desktop (or you get some banding), Magic seems fine with it's default background. Not bad for a non 'multisync' monitor.

Note sure if it's been posted already but I was going through doitf030 archive and spotted the below which could be of some use.

In this file you can find for each monitor some values for the video registers.

For example the text for a NEC Multisync 3D is:
"640x480" 25 640 672 768 800 480 490 492 525
"800x600" 45 800 840 1224 1264 600 600 606 624
"800x600" 36 800 824 896 1024 600 601 603 625
"1024x768" 46 1024 1064 1224 1264 768 777 785 817 i

* The 1st column is the name of the video mode.
* The 2nd is the Dot Clock. This is the pixel clock for the
video processor. It is the same CLOCK with the BlowUp.
* The 3th column is the hdisp (Horizontal Display). This is
the horizontal resolution of the screen. In BlowUp it is
the XRES value.
* The 4th column is the hsyncstart (Horizontal Synchro
Start). This is the distance (in pixels) between
the horizontal synchro and the beginning of the screen.
It is in BlowUp the LEFT BLANK.
LEFT BLANK = hsyncstart-hdisp.
* The 5th column is the hsyncend (Horizontal Synchro
End). This is the distance (in pixels) between
the horizontal synchro and the beginning of the screen.
It is in BlowUp RIGHT BLANK.
RIGHT BLANK = hsyncend-hdisp.
* The 6th column is the htotal (Horizontal Total).
This is the width of a line in total: synchros +
screen. In BlowUp this value is displayed in W:
parameter. RIGHT BLANK should be adjusted to have the
same value in htotal and in W:.
* The 7th column is the vdisp (Vertical Display).This is
the vertical resolution of the screen. In BlowUp it is
the YRES value.
* The 8th column is the vsyncstart (Vertical Synchro
Start). This is the distance (in pixels) between
the vertical synchro and the beginning of the screen.
It is in BlowUp the UPPER BLANK.
UPPER BLANK = vsyncstart-vdisp.
* The 9th column is the vsyncend (Vertical Synchro
End). This is the distance (in pixels) between
the vertical synchro and the beginning of the screen.
It is in BlowUp BOTTOM BLANK.
BOTTOM BLANK = vsyncend-vdisp.
* The 10th column is the vtotal (Vertical Total).
This is the number of lines used in total in one screen:
synchros + screen. In BlowUp this value is displayed in H:
parameter. BOTTOM BLANK should be adjusted to have the
same value in vtotal and in H:.

Note:
Vertical synchro seem to don't work with the values
so try differents ones if it doesn't work.


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