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

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