View source for YMF278B

'''FM Operator Type-L 4 + wave Table Synthesizer (OPL4)'''

=Pinout=
<pre>
            QFP80-(24x16)-14X20MM
+---------------------------------------------+
|  1 A0    |           | 41 WD4   |           |
|  2 A1    |           | 42 WD3   |           |
|  3 A2    |           | 43 WD5   |           |
|  4 *CS   |           | 44 WD2   |           |
|  5 *RD   | 25 *MCS0  | 45 WCO   | 65 VSS    |
|  6 *WR   | 26 *MCS1  | 46 MD6   | 66 *MWR   |
|  7 *IC   | 27 *MCS2  | 47 MD1   | 67 MA6    |
|  8 Vdd   | 28 *MCS3  | 48 MD7   | 68 MA9    |
|  9 *IRO  | 29 *MCS4  | 49 MD0   | 69 MA7    |
| 10 D0    | 30 *MCS5  | 50 *MRD  | 70 MA8    |
| 11 D1    | 31 NC     | 51 MA16  | 71 MA17   |
| 12 D2    | 32 Vdd    | 52 MA0   | 72 Vdd    |
| 13 D3    | 33 NC     | 53 MA15  | 73 MA18   |
| 14 D4    | 34 NC     | 54 MA1   | 74 MA19   |
| 15 D5    | 35 NC     | 55 Vdd   | 75 MA20   |
| 16 D6    | 36 *MCS6  | 56 MA14  | 76 XO     |
| 17 D7    | 37 Vss    | 57 MA2   | 77 XI     |
| 18 Vss   | 38 *MCS7  | 58 MA13  | 78 Vss    |
| 19 CLKO  | 39 *MCS8  | 59 MA3   | 79 *TST1  |
| 20 BCO   | 40 *MCS9  | 60 MA12  | 80 *TST2  |
| 21 LRO   |           | 61 MA4   |           |
| 22 DO0   |           | 62 MA11  |           |
| 23 DO1   |           | 63 MA5   |           |
| 24 DO2   |           | 64 MA19  |           |
+---------------------------------------------+
</pre>

=Frequency=
'''QFP80'''<br>
Set reader to FREQ, put black probe to GND, red probe to 19, 77 and 78 to measure CPU clock

=External links=
[https://en.wikipedia.org/wiki/Yamaha_YMF278 Yamaha YMF278 page on Wikipedia]
[http://www.vorc.org/text/column/hally/ymf2xx.html Yamaha chips page on vorc.org]

=Files=
<gallery widths="150px">
File:ymf278b.pdf|YMF278B Datasheet
</gallery>

[[Category:Sound Chips]]
[[Category:QFP80-(24x16)-20x14mm]]