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I've got junk of IBM PC 5170 type 1 motherboard.
This is very early Type 1 release of IBM PC 5170 BIOS.
Part No. : 6181024 (16KB) + 6181025 (16KB) = 6181028 (32KB) , 6181026 (16KB) + 6181027 (16KB) = 6181029 (32KB)