[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Attention assembly programmers...

A while ago someone posted about how to read the joystick on a //gs in native
mode.  They said that it was possible to read both paddles at once and there-
fore get much more accurate readings.  I don't recall exactly how to do this,
but I've been trying the following: strobe the analog paddle reset ($c070)
and then read locations $c064 and $c065 and wait until both return to zero.
The code I've been using is...

resetin	=     $e0c070
buttons	=     $e0c061
joy0	=     $e0c064

pad0	dw    0
pad1	dw    0

read_joy sep  #$30
	stal  resetin
	rep   #$30
	stz   pad0
	stz   pad1
]LUP    ldal  joy0
	bit   #$ff
	beq   ~j1
	inc   pad0
~j1	bit   #$ff00
	beq   allread?
	inc   pad1
allread? and  #$ffff
	bne   ]LUP
	ldal  buttons
	rts

Can anyone point out my (obvious?) mistake if I have gotten the basic method
correct?

Question #2: Why do oscillators in the DOC need to be paired to output sound?
I have gotten sound out of the DOC by only turning on ONE osc. (albeit a bit
weak) at a time.  Aside from the restriction that an osc. cannot be in SWAP or
AM/SYNC mode when playing alone, what other restrictions are there?  Also, I
haven't tried this yet, but when a generator (paired osc.) is in SYNC mode but
both output to different channels, which channel does sound go to?

Thanks for any tips...email at: andrep@balboa.eng.uci.edu


----
The University of CA, Irvine has nothing to do with these comments.  They are
only responsible for making me a smarter, poorer person.