800XL MOD?

[conda]

Does anyone know what these MOBO changes do on this 800xl? It won't boot, so I have no clue what the heck this is.

 

There is some small circuit board plugged into one of the chip slots on the left, and there is a switch on the cart holder. There there are a bunch of wires going around to different places.

 

 

 

[Curt Vendel]

Well, I see an Omnimon upgrade, looks like Basic was upgraded too, not sure on that daughterboard though, but it looks familiar, its not a memory upgrade, not quite sure what to make it up, a better shot of the daughterboard to see the chips more clearly would help.

 

 

 

Curt

[conda]

I finally got it to work. It seems to be some sort of video mod. When I plug in the DIN cord, the switch on the cart slot changes from normal video to a different video. Can't really explain it. I have to replace the keyboard to check into it further--only a few keys work. This is a weird setup.

[Shawn Jefferson]

That certainly looks like a memory upgrade too. 256k probably, since it almost looks like I can see "256" on the chips, and you have the wires going to the PIA.

 

Probably a Claus Buchholz type upgrade? The video upgrade might be a SuperVideo. There is a switch in this mod that will switch OFF the composite video, when using Chroma-luma. You get a slightly better picture that way.

 

Is it BASIC you get when you boot up without OPTION held down? If so, it's probably rev. C that is put in there. (?)

[conda]

Yes, basic boots up when it is turned on, but when the mod switch is on the video is black (or brown) text on a pinkish background. Ugly if you ask me.