yeah that was me who said that (i think)
i found that vgba or igba or both allow you to
write to unused bits in registers and allow you to read the
data you wrote to usused bits back as what you wrote,
which stuffs things up,
bit wise operators work perfectly...
i have used reg&= ~bit etc with no problems

----- Original Message -----
From: Manu / Debugger <g.manu@...>
To: <gbadev@yahoogroups.com>
Sent: Friday, June 01, 2001 9:54 PM
Subject: [gbadev] Reading old posts


> Hi!
>
> I was reading some old messages then i readed this:
>
>
> > also some emulators stuff up things with the unused bits so make sure to
> > only use the proper bits
>
> Can anyone explain me this? I'm getting really ESOTERIC results with some
of
> my logical operations (especially when doing and nots to clear bits) and
i'm
> very confused...
>
>
> Thanks for any help :)
>
>
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