Everex Systems EV231C PWA-00219-00 ISA I/O Card DB25 DB9 Serial Parallel

Everex Systems EV231C PWA-00219-00 ISA I/O Card DB25 DB9 Serial Parallel

The Everex Systems EV231C is an ISA-bus I/O expansion card that adds serial and parallel port connectivity to IBM PC/XT/AT-compatible systems. It carries part number PWA-00219-00 and is silk-screened with manufacture details from Everex Systems Inc. The card provides both a DB25 parallel port and a DB9 serial port via a rear bracket, allowing a host system to connect to printers, plotters, external modems, and other serial or parallel peripherals.

Specifications & What's Included

• Manufacturer: Everex Systems Inc.
• Model: EV231C
• Part Number: PWA-00219-00
• Bus Interface: ISA (8-bit edge connector)
• Ports: DB25 (parallel) and DB9 (serial) on rear bracket
• Main controller IC: M6003x-series (large PLCC/QFP, center of board — full marking partially legible as M60031008J / 8488)
• Additional logic ICs: Multiple SN74LS-series TTL logic chips (SN74LS374N, SN74LS245N, SN74LS245AP, SN74LS240N visible)
• Form Factor: ISA card, half-length
• Country of Manufacture: Japan (per PCB label)
• Card only — no cables or accessories included

Applications

ISA I/O cards like the EV231C were a standard component of IBM PC-compatible systems from the early-to-mid 1980s through the early 1990s. In the ISA era, base PC configurations often shipped with limited or no built-in I/O, so cards like this one were used to add serial ports (for modems, mice, terminals, and serial printers) and parallel ports (for dot-matrix and early laser printers, and external storage devices). The EV231C dates to the mid-1980s ISA expansion card era and is compatible with IBM PC, XT, and AT bus machines as well as ISA-compatible clones of that period. Today these cards are sought by collectors and enthusiasts restoring vintage PCs, hobbyists building period-correct machines, and technicians maintaining legacy industrial or scientific equipment that still relies on ISA-bus hardware.