On the v1.3 bios that i posted the i/o address is located at 0x38-0x39.
However on the v1.5 bios that ineverland and you posted the i/o address is located at 0x36-0x37.

http://www.vcfed.org/forum/showthread.php?48760-Need-help-when-use-isa-to-usb-card-in-IBM-5160!/page4

0x20 sectors per track,and 0x40 headers

Using BIOS ROM
400 880 bytes from C:\ to C:\
32 seconds
80286 @ 12MHz