Epson PX-8 User Manual

4.6 Analog interface
The PX-S has a built-in analog interface, which allows analog signals (voltages)
to be converted into numerical data for handling by software in the PX-S. It
is often referred to as an Analog to Digital converter (abbreviated to AID).
The interface is located on the rear panel marked AID IN.
• External speaker
(3-pin jack)
No. Name
1 GND
2
ANIN
3
TRIG
NOTE:
Fig. 4.26
Note
Level
I/O
Analog input
0-2V
I
Trigger signal
TTL
I
The analog interface is not supported by BASIC but call be used with a short
machine code routine and a BIOS
call. An example of such a use is given in
Appendix H.
The specifications of the AID converter are as follows:
Input level:
Resolution:
Conversion time:
Maximum input level:
o to 2.0 V
6 bits
(32 mv)
140 p-s
4.5 V
4-36
4.7 Bar Code Reader Interface
The PX-S is equipped with a Bar Code reader interface.
Fig.4.27a
Bar Code data is a specially printed bar-code which can be read with a special
Wand, which
is plugged into the BRCD socket on the back panel of the PX-S.
Such codes are common
on food packages and many other products through-
out the world. Fig. 4.27b shows an example of a Bar Code, and the Wand used
to read it.
• Bar code reader
(3-pin jack)
No. Name
1 GND
2
BRDT
3
+5
4
Fig.4-27b
Note
Level
1/0
Ground
Bar code read data
TTL I
Turned
on and off by program 4.5-6V
The use of a Bar Code reader requires special applications software. It is not
supported by BASIC
or the PX-S operating system. Please consult your EP-
SON dealer for further information
on its availability.
4-37

Epson PX-8 Specifications

General

Brand	Epson
Model	PX-8
Category	Laptop
Language	English

Summary

Chapter 1 Overview

1.2 Hardware Configuration

Describes the PX-S hardware components, including CPU, memory, keyboard, display, and interfaces.

1.3 Software Configuration

Chapter 2 Starting Up and Operating the PX-8

2.1 Starting Up

Provides precautions for computer and AC adapter usage, and procedures before switching on the PX-8.

2.2 Operating The Computer

Details operating the computer, including keyboard functions, special keys, and screen modes.

2.2.2 Switching the PX-8 on and off

2.2.4 Alternative reset sequences

Chapter 3 Operating the Computer Under CP/M

3.1 What Is CP/M?

Introduces CP/M as a popular operating system for microcomputers and its advantages.

3.2 Files And File Names

Explains file storage, naming conventions, primary names, extensions, and wildcards.

3.3 Starting To Use CP/M

Details using CP/M, including disk drive names, changing disks, and warm starts.

3.4 Using The Keyboard Under CP/M

Describes keyboard functions under CP/M, including programmable function keys and character deletion.

3.6 The Concept of Logical And Physical Devices

3.7 The CP/M Built-In Commands

Lists and explains essential CP/M built-in commands like DIR, ERA, REN, SAVE, TYPE, and USER.

3.8 Using Utilities and Application Program with CP/M

Covers CP/M utilities (PIP, STAT, SUBMIT, XSUB, CONFIG, TERM) and application programs.

3.8.6 CONFIG

Chapter 4 Input and Output Devices and Optional Additions to the PX-8

4.1 Storage of Files and Data

Discusses file storage options including Microcassette drive and optional floppy disk drives.

4.1.1 Microcassette Drive

4.2 RS-232C Interface

Explains the RS-232C interface, its operation modes, protocols, and examples of use.

4.3 Serial Interface

4.4 Using Printers with the PX-8

Chapter 5 The System Interface

5.1 The CP/M Configuration

5.2 The IOBYTE

5.3 The File Control Block (FCB)

5.4 BDOS Function Calls

5.6 The BIOS Interface

5.7 The Entry Address of the BIOS Subroutines