56K PCMCIA modem

The large yellow part bottom-left is a transformer to isolate the phone line from the PC. Top-left parts are various line interface components. 2 Large chips handle the digital signal processing and PCMCIA interfacing. Metal can top-centre is crystal for timing purposes.

Underside, 'ISSI' chips are RAMs providing data storage for the digital signal-processing, the 2 longer chips are flash rom chips containing the operating software.