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IBM 5160 - Some examples of [62X0890][68X4370] BIOS ROM sets
IBM sourced its ROM's from various makers. This page shows some examples of that variation.
U19:
• 32K x 8-bit
• IBM part number 68X4370
• Supplied here as an AMI S23256B
U18:
• 32K x 8-bit
• IBM part number 62X0890
• Supplied here as a Motorola SCM66115P