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IBM 5170  -  One example of a [6480090][6480091] BIOS ROM set



6480090_6480091_1.jpg Photo source:
www.myoldcomputers.com



Type 1 motherboard pictured, not type 2.  Presumeably, an early owner of the IBM 5170 installed IBM's "30 MB hard drive upgrade kit", a kit which replaces the original BIOS ROM set with a later set dated 06/10/85.