Star Gate Avanstar 100e 70125A-07 EISA Multiport Serial I/O Card DB-78 RS-232

Star Gate Avanstar 100e 70125A-07 EISA Multiport Serial I/O Card DB-78 RS-232

The Star Gate Technologies Avanstar 100e is a multiport asynchronous serial I/O board designed for EISA-bus computers. It provides multiple RS-232 serial ports via a single high-density DB-78 connector on the bracket, allowing servers and workstations to support a large number of serial devices — terminals, modems, printers, and other RS-232 peripherals — through one expansion slot. Manufactured by Star Gate Technologies Inc. in Solon, Ohio.

Specifications & What's Included

• Brand: Star Gate Technologies Inc. — Solon, Ohio
• Model: Avanstar 100e
• Part Number: 70125A-07
• Secondary Part Number: 006-3301028
• Bus Interface: EISA (Extended Industry Standard Architecture)
• Card Format: Full-length EISA expansion card
• External Connector: High-density DB-78 female connector on bracket (for serial port fan-out cable)
• Serial Standard: RS-232 asynchronous multiport
• PCB: Green, populated with multiple DIP ICs and one central QFP/PLCC controller chip
• Includes: Card with installed bracket only — no fan-out cables included

Applications

EISA multiport serial cards like the Avanstar 100e were used in late-1980s through mid-1990s server and workstation environments to connect large numbers of asynchronous RS-232 serial devices — including character terminals (VT100/VT220-compatible and similar), external modems, serial printers, and point-of-sale equipment — to a single host system. EISA was a 32-bit extension of the original ISA bus, introduced around 1988 as an industry alternative to IBM's MCA bus, and was widely adopted in higher-end servers and network hosts of that era before PCI displaced it in the mid-1990s. The Avanstar 100e targets multi-user computing environments requiring dense serial port concentration, such as Unix/Xenix servers supporting dumb-terminal sessions. These cards are still sought today for legacy system maintenance, retro computing, and environments running older Unix-based or DOS multi-user operating systems that depended on EISA-bus hardware.