POKEY 16-bit mode and other AUDCTL settings - A7800 emulation
Thought I'd go ahead and start this thread ...
As some of you may know, the POKEY chip has a lot of neat features, most of them controlled from the AUDCTL register. This register covers everything from changing the base clock (to pitch some or all channels up or down an octave), a hi-pass filter, and a 16-bit filter which lets you expand your note range into 16-bit, and lets you reach into the low bass range, or play higher accuracy high notes which are impossible in normal 8-bit mo
So I have tried another tune ... this time, the theme from Bubble Bobble.
I used the following setup:
AUDCTL=$70 (join channels 0 and 1 in 16-bit mode, clock channels 0 and 3 at 1.79 Mhz)
Channels 0 and 1 are distortion 12, in 16 bit mode
Channel 2 is distortion 2, clocked at 1.79 Mhz mode
Channel 3 is distortion 10, no special settings.
The idea is ... by clocking channel 2 at 1.79 mhz, the frequencies are transposed up to a playable range usin
