Robotron graphics garbage (right edge)

DarrenF

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Getting the graphics garbage on the extreme right edge of the video in Robotron. I'd be able to adjust it off the screen if needed. Everything works/plays just fine, and there's no corruption in the normal gfx area... only way over there on the right. Just wondering if this is normal for Robotron, or an indication of a problem with the CPU board's horiz. blanking circuit (or something else)...

Add'l info:

Robotron ROM board & Rev. C CPU board. Same CPU board does not have this issue with Stargate or Joust ROM boards. Also tried the Robotron ROM board with another Rev. C CPU board (the ony other working one I've got ATM), and get the same issue.

[unable to get image upload to work... will try again shortly...]

In the mean time, here's some ASCII art!
Code:
+----------------+
|               &|
|  ROBOTRON:    #|
|    2084       *|
|               %|
|               @|
+----------------+
 
Last edited:
from what i'm told these are normal, you can get them almost off the screen but what you can't is suppose to get covered up by the bezel.
 
Normal. Eugene and Larry discovered that the last byte or two on the right side of the screen normally are not displayed, so they used it as scratchpad. Because of some timing differences on boards and monitors it can sometimes appear. Just use the grid pattern in the diagnostics to adjust it out using the monitor controls.

ken
 
Normal. Eugene and Larry discovered that the last byte or two on the right side of the screen normally are not displayed, so they used it as scratchpad. Because of some timing differences on boards and monitors it can sometimes appear. Just use the grid pattern in the diagnostics to adjust it out using the monitor controls.

ken

Thanks, Ken. I've read about the "garbage" lines at the TOP of Williams games (http://seanriddle.com/lines.html) but I've never seen any documentation (or photos) describing anything on the RIGHT.

I only ever saw it because my test monitor expects a negative h-sync, and the wms positive h-sync causes the image to shift left a few inches... exposing the extreme right portion of the raster, and this "garbage". Anyhow, just wanted to make sure everything is copesetic befor selling it...
 
Looks like they got image uploading fixed.
Image attached...
 

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