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Macintosh Picture Format  |  1990-06-29  |  2.5 KB  |  720x960  |  1-bit (2 colors)  |  [PICT/MDRW]
   ocr: 54321 00000 8808 1 Ground 2 +5 volts 3 Ground 4 Mouse X2 (VIA quadrature signal 5 Mouse X1 (SCC interrupt signal) 6 (not connected) 7 Mouse switch 8 Mouse Y2 (VIA quadrature signal) 9 Mouse Y1 (SCCi interrupt signal) Figure 8DPinout for Mouse Jack