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hoglet67 / RGBtoHDMI

Bare-metal Raspberry Pi project that provides pixel-perfect sampling of Retro Computer RGB/YUV video and conversion to HDMI
GNU General Public License v3.0
838 stars 114 forks source link

Output from MDA original card not showing first three columns! #371

Closed gfmoore closed 6 months ago

gfmoore commented 6 months ago

Hi, thanks for your work on this.

I am using it to output to a old VGA display (but have tried also on a HDMI display) and with it set to MDA I get the output as I expect, but it is missing the first three columns as shown in the image. I have no ideas how to adjust this and can find no references on a web search. Chat GPT of no use either ;)

IMG_20240318_163317 1

Thanks for any help/advice.

IanSB commented 6 months ago

@gfmoore Try adjusting the H offset value in the Geometry menu. Use Save Configuration to save any changes.

gfmoore commented 6 months ago

Brilliant, set it back to zero and all very good, many thanks.

IanSB commented 6 months ago

@gfmoore Are you using a genuine original IBM MDA? If so then perhaps that should be the default setting (I don't have one myself so I have to rely on user submitted profiles which sometimes are not setup entirely correctly). Also there is another adjustment in the Sampling Menu: "Pixel H Offset" which can be used to fine tune the offset to pixel accuracy. (You need to check both the right and left hand edges of the screen to ensure that video is not missing a pixel)

gfmoore commented 6 months ago

Yes it's a genuine MDA card (version 2) I think, without the headers for the light pen. I set the offset to zero and it seems good. I'll check the right side tomorrow, but I think it's ok.

Regards, Gordon Moore @.***

From: IanSB @.> Sent: Tuesday, March 19, 2024 5:13:59 PM To: hoglet67/RGBtoHDMI @.> Cc: Gordon Moore @.>; Mention @.> Subject: Re: [hoglet67/RGBtoHDMI] Output from MDA original card not showing first three columns! (Issue #371)

@gfmoorehttps://github.com/gfmoore Are you using a genuine original IBM MDA? If so then perhaps that should be the default setting (I don't have one myself so I have to rely on user submitted profiles which sometimes are not setup entirely correctly). Also there is another adjustment in the Sampling Menu: "Pixel H Offset" which can be used to fine tune the offset to pixel accuracy. (You need to check both the right and left hand edges of the screen to ensure that video is not missing a pixel)

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