Method of Communication Between a PC and a 68000-Based System Using PARALLEL Ports
Original Publication Date: 1989-Nov-01
Included in the Prior Art Database: 2005-Jan-29
An inexpensive yet fast way to communicate between a PC and a Motorola 68000-based system is described in the following method. This method could be used for any device that needs to connect to a PC through a parallel port for both input and output. By modifying a PC parallel printer port one can communicate bidirectionally with the 68000-based system via one of its 68230-based parallel ports using all 8 bits. The throughput of this link can reach 100 Kbytes/sec on an AT, but with the addition of some error prevention code in the programs a 30 Kbyte/sec rate is achieved. The previous method of data transfer was a serial link running at 19.2 KBd ... approximately 2 Kbytes/sec. Other parallel data transfer methods would have required a purchased Parallel I/O card or a home-grown interface developed to link to the PCAT bus.