Hey all
>IE0 is to enable/disable interrupts from a lightpen/mouse connected to the
>v9938/58. However, in the MSX system the mouse is read through the PSG and a
>lightpen is most of the time not connected (you'll have to solder on your
>VDP to do that... there is no connector for it).
Oops I think I completelty messed the bit numbering in my previous post.
My Portar doc says this lightpen/mouse thing is done by bit IE2 (that's bit #5
of register 1), whereas IE0 (bit #5 of register 0) is the vertical retrace
enable. Surely my docs are wrong then?
>On MSX it is #FF by default. However, this is not specified in the MSX
>system (in fact IM1 is the only official interrupt-mode, although IM2 can be
>used too) so it can actually have any value because of a distortion or so...
>All programs should fill the entire area from I*256 to (I+1)*256 (INCLUDING
>the last byte!!!)...
I know this method already (as a matter of fact it's the one I chose just to
make sure everything worked ok). I just wanted to know if I could assume any
defalut value.
>I wrote a very extended article about it in one of the most recent
>XSW-Magazine issues... You should really take a look at that. But it's in
>Dutch, though.
Pity my Dutch's a bit too crusty these days :)
Thanks Laurens
Jorge
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