U15 provides a single 8-bit EPROM socket for the AMIBIOS ROM. The AMIBIOS for the SX CAT is designed specifically for the Chips and Technologies, Inc.
SCATSX CHIPSet.
U16 Keyboard Controller
The SX CAT uses an AT compatible keyboard controller that supports both 84-key and 101-key AT compatible keyboards. The keyboard controller also controls
the turbo LED control via the AMIBIOS.
U27 80387SX Math Coprocessor Socket
An optional 80387SX can be inserted in the U27 socket. The math coprocessor can vastly improve spreadsheet and CAD software performance. The math
coprocessor must be rated at the same speed as the processor.
Warning
Do not install or remove the 80387SX unless power is removed