|•||ROMS marked '5000026' and '5000027'. Photos at here.|
|•||The 'Upgrading and Repairing PCs' book (Scott Mueller), and most other information sources, do not include this BIOS in their list of BIOS' for the IBM 5160.|
|•||To date, I am only aware of one person with a set of 08/16/82 BIOS ROMs.|
|•||The IBM 5160 was announced on March 1983.
The date of both the 08/16/82 BIOS and 11/08/82 BIOS precede that date, with the latter being some 7 months prior to March 1983.
So at least 7 months before 5160 announcement, IBM found reason to produce another revision of BIOS.
|•||An observation is that the model byte (A.K.A. model code, ID byte) in the 08/16/82 BIOS is FF, reflecting a 5150 (PC). Refer to here.|
|•||Following are some possibilities that I can think of:
• The 08/16/82 BIOS was not released to the public.
• Some 08/16/82 BIOS equipped 5160's that IBM held on to internally, eventually made it into the public domain.
• Although the 08/16/82 BIOS was replaced by the 11/08/82 BIOS at least 7 months prior to 5160 announcement, IBM did not consider the 08/16/82 BIOS to be 'unreleasable', and consequently, already-manufactured stocks of 08/16/82 BIOS ROM chips went out in some early batches of the 5160.