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20190305 142831.jpg.358170d3db35611bd2ad24ab899e610b.jpg
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The MacRescue upgrade board apparently clips on to the existing logic board on a Macintosh 128K or Macintosh 512K to provide extra RAM capacity and a SCSI interface. In at least one example, a ribbon cable ran from the upgrade board to a 25-pin port on the rear of the unit.

The unit in the pictures indicates this was manufactured in 1989 by Computer Care.