Vintage Hayes Smartmodem 2400B internal ISA dial-up modem card, a classic piece of early PC networking hardware from the late DOS era. This unit features dual RJ11 ports labeled line and phone, onboard speaker for authentic dial tones and handshake sounds, and the original Hayes chipset that helped define modem communication standards. Designed for use in IBM-compatible systems with ISA slots, this card is ideal for retro computing enthusiasts, BBS hobbyists, or collectors looking to restore or display period-correct hardware. A great addition for vintage PC builds, telecom history collections, or anyone interested in early internet and data communication technology.