Two-Speed Receive Method to Prevent Printer Interface Time-Out
Original Publication Date: 1986-Jan-01
Included in the Prior Art Database: 2005-Mar-08
A technique is described whereby two-speed interface controls are incorporated between a host computer system and an attachment communications interface so as to prevent a "time-out" interrupt condition. Time-out conditions could cause faulty interruptions in applications requiring extensive operations of attachment devices, such as printers printing high resolution graphics. The two-speed interface control concept provides an inexpensive method of eliminating faulty time-out interrupts by using a circular 1K memory buffer and by regulating the rate of data flow to an attachment device. An algorithm allows data flow to the attachment to proceed at either high speed or low speed by using increment counters to detect and control the data reception rate.