Epson HX-20 User Manual

Chapter 9

This chapter provides information of interest to technically-

sophisticated users. If you are just learning about computers, ignore

this chapter. Turn instead to the  Epson HX-20 BASIC Tutorial

and Reference Manual,  and learn how to program your HX-20. For

detailed specifications,  see  the  Epson HX-20 Technical Reference

Manual.  All specifications are subject to change without notice.

The HX-20 has two microprocessors for distributed and concurrent

I/O processing. The microprocessors (both 630l’s) communicate

with each other through their serial communications ports.