Casio PT-280

Chip: NEC D23C256EAC-092 (DIP28, /CS (active low), OE (active high))

Print:
~~~~~~~~~~~~~~~~
 NEC JAPAN
 D23C256EAC 092
 8831KX702
~~~~~~~~~~~~~~~~

Lossless converted waves are included for your sampling delight.

================================================
Percussion sound chip with maskrom: OKI (MS)M6294-02  (might someday be dumped as well)

Print:
~~~~~~~~~~~~~
 M6294-02
 OKI
      883005
~~~~~~~~~~~~~


I'll see if can palpate a way to dump this chip 16kbyte maskrom as well,
yet maybe it can only be done via decapsulation (which anyways may happen someday).
If I do, it will also be in some later update, and even if not, there will
be sample-perfect captures of all the rom drum waves.
I've already desoldered it and looked into its controls; its output is tdm with separate
time slots for each voice channel (4 voice time slots, each 4 clocks; 15.625kHz samplerate).
There are also some outputs (seemingly four separate voice outputs), but they are likely inactive
and not implemented in its firmware.


Edward d-tech
www.dtech.lv
