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Macintosh Picture Format  |  1990-06-29  |  2.3 KB  |  720x960  |  1-bit (2 colors)  |  [PICT/MDRW]
   ocr: byte 0 channel B transmit buffer empty 4 channel B external/status changaouse vertical 8 channel B receive character available 12 channel B special receive condition 16 channel A transmit butter empimouse horizontal 20 channel A external/status change 24 channel A receive character available 28 channel A special receive condition Figure 6DLevel-2 Secondary Interrupt Vector Table