YM2151

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Equivalence table
Rebadged as Found on PCB (manufacturer)
BS901 Afega, Danbi, F2System, Omega System, SemiCom
CA5101 Jeil Computer System
CY5001 Afega
KA51 Omega System, Semicom
PD2001 Afega
U6651 Semicom

FM Operator Type-M (OPM)

Pinout

DIP24
         +---\/---+
Vss(GND) | 1    24| ØM
    *IRQ | 2    23| Ø1
     *IC | 3    22| Vdd(+5V)
      A0 | 4    21| S0
     *WR | 5    20| SH1
     *RD | 6    19| SH2
     *CS | 7    18| D7
     CT1 | 8    17| D6
     CT2 | 9    16| D5
      D0 |10    15| D4
Vss(GND) |11    14| D3
      D1 |12    13| D2
         +--------+

Frequency

DIP24
Set reader to FREQ, put black probe to GND, red probe to 23 and to 24 to measure CPU clock

External links

YM2151 page on Wikipedia

Files