Description:
Universal Comm Slot card provides internal 28.8k modem via external RJ-11 jack. Uses the serial signaling in CS or CSII slot, and is usually accompanied by a blank cover to fill Modem port (port becomes unusable when CS or CSII modems are installed; Apple OEM version of port cover is 815-2130, unsure if GV shipped their own.)
Identifying Numbers:
TelePort™ Platinum V; A809; IEJA809; 05-3900 C1; 815-1581 REV. C
Onboard logic:
Rockwell ..(presumed); Atmel AT27C010 45JC; Winbond W24257AS-35; Motorola MC33179D XAF545; Motorola MC33179D XAE545; Motorola ACT00 XAB543; Motorola HC4053 FDS550; Philips 74HC4053D A05320Q; Rockwell R6723-13 9611 A98207-3; Rockwell RCFSP R6674 16 9552 A89466-2

Description:
PowerBook 500 series modem provides 14.4Kbps? communication via an external RJ-11 jack. Shipped by Apple as the OE modem for the 500 series in applicable markets.
Identifying Numbers:
PowerPort/Mercury for PowerBook 500 Series; Model A540; IEJA540; FAB 05-1000 C; SBC-2B 94V-0 22-94
Onboard logic:
AT&T V32-INT2-SF