ocr: Ou ubsttatimber reserved 1 4 hard disk driver (XL only) 2 8 Printer Driver 3 12 Sound Driver 4 16 Disk Driver 5 20 Serial Driver port A input 6 24 Serial Driver port A output 28 Serial Driver port B input 7 32 Serial Driver port B output 8 36 AppleTalk .MPP Driver 9 40 AppleTalk .ATP Driver 10 44 reserved 11 48 Calculator 12 52 Alarm Clock 13 56 Key Caps 14 60 Puzzle 15 64 Note Pad 16 68 Scrapbook 17 72 Control Panel 18 notu used 124 not used 31 Figure 3DThe Unit Table
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 (''The Postman Always Clicks Twice'')_iso/Dev.CD 199301.iso/Technical Documentation/Inside Macintosh/SpInside Macintosh/SpInside Mac PICTs/SpInside Mac 019/SpInside Mac 019 - Figure 3/SpInside Mac 019 - Figure 3.PNG)