HP 82208A/C Serial Interface Kit

[asciacca]

The major difference between the IBM compatible A version and the DOS compatible C version of the 82208A software is that the A version supports RS232 ports 1-4, COM1-4 and BIOS ports which has allowed it be used with USB devices as contrasted against C version which only support RS232 ports 1 and 2. This is what makes the C version only DOS compatible.