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948 B
948 B
Yamaha YM2151
the sound chip powering several arcade boards and the Sharp X1/X68000.
it also was present on several pinball machines and synthesizers of the era, and later surpassed by the YM2414 (OPZ) present in the world-famous TX81Z.
effects
10xx
: set noise frequency of channel 8 operator 4. 00 disables noise while 01 to 20 enables it.11xx
: set feedback of channel.12xx
: set operator 1 level.13xx
: set operator 2 level.14xx
: set operator 3 level.15xx
: set operator 4 level.16xy
: set multiplier of operator.x
is the operator (1-4).y
is the mutliplier.
17xx
: set LFO speed.18xx
: set LFO waveform.xx
may be one of the following:00
: saw01
: square02
: triangle03
: noise
19xx
: set attack of all operators.1Axx
: set attack of operator 1.1Bxx
: set attack of operator 2.1Cxx
: set attack of operator 3.1Dxx
: set attack of operator 4.