gbadev : Message: Reading old posts

gbadev

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Message #4106 of 15019 |

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 :)

Fri Jun 1, 2001 11:54 am

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Message #4106 of 15019 |

Expand Messages	Author	Sort by Date
I've been playing around with nokturn's second tutorial (fields of battle) but I seem to have run into a small snag. I decided to try creating a simple title...	Chris Pepin cpepin1@...	May 26, 2001 11:29 am
... You also have to reset the key input register. Once a flag is cleared, it will remain cleared until you set it again. while (!(P1 & KEY_START)) { P1 =...	Jason Wilkins fenix@...	May 26, 2001 1:03 pm
... Hmm, on second thought, thats not it, because you are looking for a single key press. I actually think that problem is that P1 has not been declared ...	Jason Wilkins fenix@...	May 26, 2001 1:06 pm
... Well that didn't seem to work. ORiginally I had it declared like this. typedef unsigned short u16; #define P1 ( u16 )0x04000130 So I changed it...	Chris Pepin cpepin1@...	May 26, 2001 8:16 pm
your problem is that the keys are active low, you seem to want to display the pic until the start key is pressed so you must use ~KEY_START (unless you have...	Kiasecto kiasecto@...	May 26, 2001 11:17 pm
... Thanks. That seemed to do the trick, though you did forget the first bracket. ;-) Chris Pepin cpepin1@... ... Tom Swift and His Electronic Web ...	Chris Pepin cpepin1@...	May 27, 2001 2:56 am
Hi! ... 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...	Manu / Debugger g.manu@...	Jun 1, 2001 7:16 pm
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...	Kiasecto kiasecto@...	Jun 1, 2001 11:48 pm

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