This is the first BIOS for the IBM 5170.
It is dated 10JAN84.
It is found in type 1 motherboards running at 6 Mhz.

U27 has the IBM part number of 6181028, and is 32K in size
U47 has the IBM part number of 6181029, and is 32K in size

8 bit checksum of 6181028 = 36
8 bit checksum of 6181029 = CA
                           ----
                    added = 00


There are two BIN files in this ZIP file:
1. BIOS_5170_10JAN84_U27_6181028_27256_6MHZ.BIN  --> Use this to create a U27 using a 27256 EPROM (rated at 150nS or faster)
2. BIOS_5170_10JAN84_U47_6181029_27256_6MHZ.BIN  --> Use this to create a U47 using a 27256 EPROM (rated at 150nS or faster)