Comtrol Hostess 554

Comtrol Hostess 554 ... buffering that reduces the number of system interrupts and increases system throughput. It's hard to find a more economical or simple way to enhance multiuser system performance.

Using a single expansion slot, Hostess 554 controllers can connect four, eight, or sixteen asynchronous serial devices such as terminals and printers. Like all Comtrol products, Hostess 554 gives you the freedom of choice and the flexibility to grow. Upgrade modules allow growth from four to eight ports. To increase users beyond eight, try the 16-port controller. And when you need more than 16 users, add up to four controllers in your PC.