|Note 1||In the 11/08/82 BIOS revision, 720K diskette operation is partially supported. More information is here.|
|Note 2||Refer to the diagram here.
In the 11/08/82 BIOS revision, chip U19 contains part of cassette BASIC and thus is not critical to operation of the computer (only cassette BASIC is lost).
For that reason, if the POST discovers that U19 has failed, the POST will display "F6000 ROM" and allow booting to continue.
This is not the case for the later BIOS revisions, because in those, U19 also contains part of the BIOS. If U19 fails in those, the motherboard will appear 'dead'.
|Note 3||A 1.2M floppy drive is a high density (HD) drive. The floppy controller that IBM supplied in the IBM 5160 (photo) does not support HD operation.|
|Note 4||See here for details of a possible problem caused by the 05/09/86 BIOS.|