Sharp PC-1261 Service Manual page 7

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8-1. PC-1261 flat type PWB circuit diagram
Since the first production unit the P-COS type RAM unit (2 KB x 5) has been used for the PC-1261 memory PWB unit.
But, in some of PWB unit in future, it may be superseded by the flat type PWB unit that consists of the 8 KB flat packaged
RAM (UPD4364G-20L), composed of the flat packaged the P-COS type RAM (2 KB x 4), and the 2 KB RAM (HM6116 or
TC5711 ).
The P-COS type PWB unit will be in supply for service parts for the time being.
The flat type PWB unit is interchangeable with the P-COS type by the whole unit.
NOTE: P-COS means the printed circuit board on which LSI chips are directly bonded.
8. CAUTION ABOUT THE PC-1261 MEMORY PWB UNIT {P-COS AND FLAT TYPES)
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PC-1260
PC-1261