apple iic monitor a2m4090 horizontal width adjustment

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apple iic monitor a2m4090 horizontal width adjustment
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hello,

Cant find the way to adjust the gorizontal width size of the picture. Look at the picture i attached. i want to use all the screen width with no black margins.

i think i tried every potentiometer/knobs i have found on the board, they do all the other things accept what i'm looking for

 

any help on this ?

 

 

 

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Last seen: 2 years 3 months ago
Joined: Mar 31 2020 - 19:55
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You'll need to adjust the

You'll need to adjust the width coil, internally, on the Monitor //c.

 

Apple_IIc_Monitor_A2M4090.pdf

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Last seen: 1 year 9 months ago
Joined: Apr 4 2020 - 06:01
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Timelord thank you , i know

Timelord thank you , i know that and i tried reading the Sams manual but cant find the right coil to do that, i tried evryone (i think)

 

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Last seen: 2 years 7 months ago
Joined: Dec 18 2021 - 14:30
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I know this post is a bit old but,

I'm having the same issue. I just repaired a A2M4090 that was dead. It's model is G090H and it does not have the L505 coil that the Sam's manual refers to. Infact there are no identifiers in the 500 range on my mainboard that I can see. Is there some other way to adjust the horizontal size on this model of the pcb? it's the only thing stopping this monitor from being a near perfect display.

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Last seen: 2 years 7 months ago
Joined: Dec 18 2021 - 14:30
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Maybe this is normal?

While trying to find a schematic for the revision of the monitor I have, G090H, I've seen a lot of pictures of this monitor displaying software and I haven't seen one that has the image extend to the horizontal edges yet. Maybe this is normal and doesn't need to be adjusted. I didn't have this computer in it's hey day and I can't remember what it looked like the few times I did use one. Prince of Persia looks great on this monitor I have. The aspect ratio looks correct. So maybe the image isn't supposed to extend to the horizontal extents.

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Most of those CRTs of that

Most of those CRTs of that era the picture doesn't go all the way to the edge of the glass.  Usually there is a fair gap  A lot of those tubes have a lot of curvature towards the outter part of the face and that can introduce a lot of distortion to the image.

 

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Last seen: 2 years 7 months ago
Joined: Dec 18 2021 - 14:30
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Thank you. I figured as much.

Thank you. I figured as much. I was a child when these were popular and had a C64 that I just plugged up to a standard television. My band teacher, who I was very fond of,  had a //c that was already quite long in the tooth by the time I saw it and I don't really remember how the screen looked other than being monochrome green. We'd play Lemonade Stand on it and some other game that I can't find now. It was a very simple "driving" game that used ascii characters I believe where you basically had to keep a square in between the two curving lines that I assume represented a road. Good old warm and fuzzy memories of that little green screen.

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