To the best of my knowledge, you can't, not without some additional software. 16 or 32 bit settings are the only user settings available in XP. I vaguely recall seeing some software that opened up an 8 bit option but I don't recall the name or where, exactly, I saw it. I suggest you search for " How to set 8 bit color quality on Win XP"
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Rightclicck on Desktop. Select Properties. Select the Settings tab. Adjust resolution and color depth to suit your needs. Hit OK.
I'm presuming you're referring to display resolution. If you meant something else, please clarify.
In that case, my answer should give you what you're asking for. Which may or may not be what you want, since you didn't tell us why you want it.
Sorry,I meant color quality.
Refer to the answer I gave HERE a few days ago. XP is the same and 256 colour mode is one of the options.
That's the one I was looking to quote but couldn't find it.
Neither could I - Maybe the author deleted it. (I think deleted items still lurk in the system.) I had a comment to link back to it from though.
8-bit-colour software (e.g. Doom) can run under XP, but what is it you're trying to use? L