Search found 49 matches

by Sauraen
Sat Sep 26, 2015 3:00 pm
Forum: Sound
Topic: New Documentation: An authoritative reference on the YM2612
Replies: 859
Views: 372784

Re: New Documentation: An authoritative reference on the YM2612

Okay, I got Test Register $2C! $2C:7 - Selects whether the TEST pin is an output or input. (Presumably 0 = output, 1 = input, since power-up state is output.) $2C:6 - Goes to the same unit as the TEST pin's input wire, which is a small control unit at the upper right of the EG. I will try to figure ...
by Sauraen
Tue Sep 22, 2015 2:03 pm
Forum: Sound
Topic: New Documentation: An authoritative reference on the YM2612
Replies: 859
Views: 372784

Re: New Documentation: An authoritative reference on the YM2612

More info! http://i.imgur.com/yt0p3IV.jpg http://i.imgur.com/J5lfNGM.jpg This is, as I had expected, the address decoder table of the YM2612. Note that bits 0, 1, and A1 from the bus (they're in order 0-7 then A1) go directly to the control unit on the left; bits 2 and 3 go to the control unit as we...
by Sauraen
Mon Sep 21, 2015 2:28 pm
Forum: Sound
Topic: New Documentation: An authoritative reference on the YM2612
Replies: 859
Views: 372784

Re: New Documentation: An authoritative reference on the YM2612

Note that the YM2608 uses that register range (and $10-$1F as well). The YM2612 is pretty much the YM2608 with a lot of features removed (and the DAC slapped in). I started working on the die shot of the YM2203, since it's clearer and easier to read than the one of the YM2612. I'm not quite done wi...
by Sauraen
Sat Sep 19, 2015 10:19 pm
Forum: Sound
Topic: New Documentation: An authoritative reference on the YM2612
Replies: 859
Views: 372784

Re: New Documentation: An authoritative reference on the YM2612

Hi everyone, this is Sauraen from the MIDIbox forums . I'm the one who made MIDIbox FM V2.1 / V2.0 , and the 32-bit OPL3 driver for MIOS32 (the MIDIbox operating system). I'm now working on MIDIbox Quad Genesis , a similar synth with four YM2612s and four SN76489/SN76494/SN76496es. But that is a top...