D3578-69001 is represented by #8 in the diagram below.
4
C3190-69139 Module
Electronics module - Contains power supply, cooling fan, main logic PC board, and interface connectors
8
C2065A Memory
4MB, 80nS, 36-bit SIMM memory module - For HP Plotters, LaserJet IIISi, 4/4M, 4Si/MX and other models.
8
C2066A Memory
8MB, 80nS, 36-bit SIMM memory module - For HP LaserJet IIISi, 4/4M, 4Si/MX
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