2012.03.30
Desastre Natural
Understood and hooked up sound HW in Little Robin, that is a weird
combination of 2 DAC sound chips, the video scanline register,
interrupt generation (irq lv 4 with an input port that defines the
kind of irq, currently hooked up with the video frame number) and
two lovely 16-bit port registers (one for each DAC) that alternates
the resulting 8-bit sound index according to an external source
(frame number % 16 with current implementation, as each “sound irq”
happens every 8 frames). And by alternation it means in the sense of
muxing between LSB or MSB of the aforementioned sound index (that is
obviously pointless if isn’t a form of protection).
http://www.youtube.com/watch?v=b0kC_pKGcwU&feature=player_embedded
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來源：http://mamedev.emulab.it/kale/?p=1674
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Desastre Natural
Understood and hooked up sound HW in Little Robin, that is a weird
combination of 2 DAC sound chips, the video scanline register,
interrupt generation (irq lv 4 with an input port that defines the
kind of irq, currently hooked up with the video frame number) and
two lovely 16-bit port registers (one for each DAC) that alternates
the resulting 8-bit sound index according to an external source
(frame number % 16 with current implementation, as each “sound irq”
happens every 8 frames). And by alternation it means in the sense of
muxing between LSB or MSB of the aforementioned sound index (that is
obviously pointless if isn’t a form of protection).
http://www.youtube.com/watch?v=b0kC_pKGcwU&feature=player_embedded
來源：http://mamedev.emulab.it/kale/?p=1674
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ポーラステーション
http://perryt0517.wordpress.com/
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