EPSON HX-20 OPERATIONS MANUAL BY Kenneth Skier President SkiSoft, Inc.
All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without the prior written permission of Epson America, Inc. No patent liability is assumed with respect to the use of the information contained herein. While every precaution has been taken in the preparation of this book, the publisher and author assume no responsibility for errors or omissions.
Federal Communications Commission Radio Frequency Interference Statement “This equipment generates and uses radio frequency energy and if not installed and used properly, that is, in strict accordance with the manufacturer’s instructions, may cause interference to radio and television reception.
CONTENTS 1 Congratulations! . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2 Cautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dummy cartridge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . System bus cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Circuitry cover . . . . . . . . . . . . . . . . .
Virtual screen width . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Logical lines vs. physical lines. . . . . . . . . . . . . . . . . . . . . . . . Retyping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Deleting text . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Insert mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Upper and lower case. . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 1 Congratulations! Congratulations! You have just purchased the first of a new generation of personal computers. The Epson HX-20 is unlike any product ever built, combining the power and usefulness of a desktop computer with the portability of a pocket calculator. It’s a go-anywhere, doanything system designed from the start to be user-friendlywhich means you don’t have to know anything about computers to use it.
memory even when you turn it off J Contained within the HX-20 is an extended version of Microsoft BASIC, a powerful programming language that is easy to learn and which takes full advantage of the many special features of the HX-20. If you have no interest in programming, y o u c a n p u r c h a s e programs and run them on your HX-20. But if you do wish to learn about programming, the accompanying Epson HX-20 BASIC Tutorial and Reference Manual will teach you everything you need to know.
permanently with the desired capabilities. Only one option ROM can fit inside the HX-20 at a time, but it’s a powerful means of customizing the HX-20 for a desired application-without diminishing in any way its ability to run BASIC programs or to accept option cartridges. Option cartridges also tailor the HX-20 for specific applications. You can install a cartridge in moments, simply by sliding it into a recessed compartment in the case of the HX-20.
I I -one or more floppy-disk units, which may store dozens or hundreds of programs and data files on-line, for virtually instant access; -a bar code reader, to scan barcoded programs, songs, and data sheets. 4 As you can see, the HX-20 is powerful, portable, easy to use and expandable. Whether you wish to use it for school, for business, or just for fun, you could hardly choose a more personal personal computer.
Chapter 2 Cautions The HX-20 is not a toy. Although it is solid and well-built, it is not invulnerable. Treat it with the care it deserves, and it should provide you with years of reliable service. The warnings on these pages concern only the HX-20. If you connect your HX-20 to any peripherals, be sure to heed any warnings contained within the documentation for those peripherals. (Note: failure to observe the following cautions may void the warranty on your HX-20.
cartridge Leave the dummy cartridge in place If you purchase an option cartridge containing a program or a microcassette recorder, then you will need to remove the dummy cartridge in order to insert the option cartridge. But until then, please leave the dummy cartridge in place. When no cartridge is in place, one of the HX-20’s connectors is exposed. Static electricity or metal objects contacting this connector can damage the HX-20’s circuitry.
Treat the circuit cover with care If you turn your HX-20 upside down, you will notice something that looks like a trap door. This covers the HX-20’s internal circuitry. circuit cover Treat the circuit cover with care PLEASE NOTE: You should not remove this cover yourself! Removing it exposes the static-sensitive circuit to possible damage. Your warranty will become void if you attempt to modify, adjust, add, or insert any ROM or other part or device in this compartment.
plugs identical to the one on the HX-20 battery charger.) Using any battery charger other than the one that came with your HX-20 may damage the HX-20 and/ or its batteries and could void your warranty. Use only the HX-20 AC adapter to charge HX-20 batteries Don’t overcharge the batteries If you operate the HX-20 with the battery charger connected, eventually you will overcharge the batteries.
recharge the HX-20 before you see that message, you will only shorten the useful life of the batteries. Charging the batteries for more than eight hours at a time will shorten their life. Charging them continuously for more than seven days can destroy them. I Don’t overcharge the batteries If your batteries fail to hold a charge, take your HX-20 to an Epson Service Center. DO NOT ATTEMPT TO REMOVE THE BATTERIES YOURSELF, or you could damage your HX-20.
Plugging in a device that does not conform to these specifications may damage the HX-20 and/or the device you plug in, and may void your warranty. Connect the HX-20 only to appropriate peripherals Protect the HX-20 from physical shock Don’t drop your HX-20, or let it shake about. Like any other electronic product, the HX-20 can be damaged by such treatment. Pack it in its original box, using the original packing materials, whenever you ship it.
Protect the HX-20 from extreme heat and cold The HX-20 is designed for use in conditions where the temperature is below 95° F (35° C), and above 41°F (5° C). The HX-20 will not work reliably outside of this temperature range. Protect the HX-20 from extreme heat and cold Storing the HX-20 in conditions that are too hot or too cold may damage it permanently.
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Chapter 3 Preparing your HX-20 for use Before you use your HX-20 for the first time, you must take several steps: I) Unpack it. 2) Charge the batteries. 3) Put paper and a ribbon in the printer. 4) Adjust the LCD display. 5) Initialize memory and the calendar clock. If you need to work with special symbols, you might also wish to select a different character set. See page 27. Unpacking the HX-20 Remove the HX-20, the battery charger, and all packing materials from the box.
3) A roll of paper for the printer. 4) A ribbon cartridge for the printer. 5) This manual. 6) The Epson HX-20 BASIC Tutorial and Reference Manual. 7) The registration card. 8) A warning sheet concerning the battery charger. Fill out the registration card at the time of purchase and mail it to Epson. With your registration card on file, Epson can provide continuing software and hardware support to help you in using your HX-20.
Uncoil the battery charger cable. At the free end of this cable is a small, cylindrical plug: Insert this plug into the socket labelled “ADAPTER” on the back of the HX-20: DO NOT TURN ON THE HX-20! If you leave your HX-20 power on, your batteries will not be fully charged at the end of eight hours. The batteries in the HX-20 are now charging. Allow them to obtain a full charge for eight (8) hours. Then disconnect the battery charger from the AC outlet, and unplug it from the HX-20.
When the HX-20 is shipped from the factory, the ribbon and paper are not installed in the printer. To prepare the printer for use, you must perform the following steps: 1) Remove the printer cover. 2) Insert the paper roll. 3) Insert the ribbon cartridge. 4) Replace the printer cover. The only tools you will need are your fingers. Removing the printer cover Four small grooves and the word “PUSH” are embossed on the printer cover.
When you have tilted the printer cover up to a near-vertical position, you may lift it completely from the HX-20: I I Now you can look directly into the printer compartment. Inserting the paper roll Note the ON-OFF switch on the right side of the HX-20.
(Pay no attention to the screen at this point.) Turn the printer on, by sliding the PRINTER ON-OFF switch to the right: The printer will remain inactive. Now, with your thumb on the front of the paper cover, and your other fingers on the back, pull the paper cover up, rotating it towards the back of the HX-20: (Unlike the printer cover, which is removable, the paper cover may not be removed from the HX-20.) You may now look into the paper compartment, which is empty except for a strip of fabric.
Now you need the roll of printer paper that came with your HX-20. When you use it up, replace it with the same kind of paper (available at your Epson dealer). Do not use any other paper, as it may jam or otherwise damage the printer. Unroll several inches of this paper: Slide the paper through the slot connecting the paper compartment and the printer compartment.
While holding the paper in place, press the PAPER FEED button. The printer will activate, and a rubber roller will pull the paper into the printer compartment. Hold the PAPER FEED button down until the paper emerges from the top of the printer mechanism. When an inch of paper has emerged from the top of the printer, release the PAPER FEED button: Now pull the paper through the printer, until several inches are exposed: Put the roll of paper into the paper compartment on top of the strip of fabric.
Close the paper compartment by pulling the paper cover all the way forward. Be sure that you don’t close the paper cover on the free end of the paper roll. Inserting the ribbon cartridge Packaged with your HX-20 is an L-shaped ink ribbon cartridge: Holding it as shown, you may slide it over the paper and into the printer compartment. Be sure the paper goes between the ribbon cartridge and the ink ribbon.
Push the ribbon cartridge down into the printer compartment, until the top surface of the ribbon cartridge is level with the metal plate. (Do not be concerned if the ribbon has some slack and rests on top of the metal plate.) The ribbon cartridge is now installed. (Eventually, the microprinter will produce very faint copy, and you will need to replace the ribbon. To remove a ribbon from your HX-20, press on the word “PUSH” embossed on the right side of the ribbon.
Push the back of the printer cover down and into place: I I Press the front of the printer cover down: The printer cover is now in place. Adjusting the viewing angle The HX-20 uses an LCD (Liquid Crystal Display) screen. Unlike a television or movie screen, an LCD screen can only be viewed from within a narrow range of angles.
At one angle you might not see any text at all on the screen. At another angle the entire screen may look black. But you will discover an optimal viewing angle: an angle from which you will find it very easy to read the screen. Nevertheless, you won’t have to sit in any particular position while using the HX-20.
Initializing memory and the calendar clock Before you use the HX-20 for the first time, you must initialize its memory and its calendar clock. (If your HX-20 is not on now, turn it on.) The screen will look like this: I CTRL/@Initialize 1 MONITOR 2 BASIC I (Note: there may be various letters and symbols under “1 MONITOR”. Ignore them.) If you can’t read the text on your screen, adjust the VIEW ANGLE knob on the right side of the HX-20.
Figure 3-1 Format for Specifying Date and Time MM DD +ay YY !.,. MM SS HH / j ?,.k= You must enter IWO digits for each of these units of time. For example, let’s say that you are reading this in the month of January. Even though it’s the first month of the year, you may not specify the month with a “1”. The HX-20 expects two digits, so you must enter “01” for the month. The hour (HH) is based on a 24-hour clock. Thus, midnight is 00, noon is 12, and 9 PM is 21.
Your HX-20 is now ready for use. Selecting a different character set Please note: The following information is for dealer reference only! The circuit cover should be removed only by an authorized Epson dealer or service center. Removing it yourself will void your warranty. You may select special character sets by using HX-20 software; see The HX-20 BASIC Tutorial and Reference Manual. The HX-20 can display and print special characters required by users in a number of different countries. (See Table 3-1.
You will see a shiny, flexible flap. Carefully lift this up and out of the way. One component, called a DIP switch, looks like this (enlarged to show detail): The DIP switch is actually a set of four switches. To specify the character set of a given country, look up the appropriate switch settings in Table 3-2, and set the individual switches with a ball point pen or similar object.
TABLE 3-2 DIP Switch Settings for International Character Sets Switch 1 Switch 2 Switch 3 Denmark On On Off England Off Off On France Off On On Germany On Off On Italy On Off Off Spain Off Off Off Sweden Off On Off USA On On On Desired Country (Switch 4 has no effect on the HX-20’s character set. Leave it in the off position.
Chapter 4 Using the HX-20 Once you have prepared the HX-20 for use, you may use it anywhere, at any time. Just turn it on, view the menu, and choose an item from the menu. Turning it on To turn on the HX-20, find the ON-OFF switch on the right side of the HX-20, and push it towards the back of the HX-20: A menu will appear on the screen. (If you can’t see the menu clearly, don’t be concerned; this only means that you must adjust the screen angle. See page 23.
Or it might be much longer. However, if it is longer, its first few lines will look exactly like the above menu. The above menu is three lines long, so you can see all of it on the screen at one time. But a menu might list as many as seventeen jobs-far too many to fit in one screen. How can you view such a long menu? Just press the B key. If additional items are stored in the menu, the screen will move up.
TABLE 4-1 Keys You May Use To View The Menu Key Effect The entire menu will scroll up through the screen. When the scrolling stops, you will see item “1” in the top of the screen. Same as the key. Text on the screen will scroll up by four lines. Once you have scrolled to the bottom of the menu, pressing m will cause the menu to “roll around” to item “1”. Thus, if you keep pressing m , you can read through the menu again and again. Text on the screen will scroll down by four lines.
To answer that question, let’s take a look at a particular menu: q (Press to see the top line of this menu on your screen.) Each line in the menu lists a job the HX-20 may perform, by specifying a key and the job associated with that key. To choose an item from the menu, press the key listed next to that item. Thus, to select the press m/I@ t o initialize the system, press Monitor, or press to select BASIC.
Chapter 5 The screen editor When you use BASIC or almost any application program, you will interact with the HX-20 by typing on the keyboard, and it will respond by displaying text and graphics on the screen. This is made possible by the screen editor. Because the screen editor is central to almost all HX-20 applications, you can do little with the HX-20 until you learn how to use it. Since the screen editor is so important, this chapter will show you how to use it in a “hands-on” fashion.
If you place that piece of paper on any page in this book, it will cover up all but a small portion of the page. Yet by moving that window horizontally and vertically, you can bring any desired portion of the page into view: Moving the window does not change what’s on the page. It just changes what’s in the window. The text on the page is still there, whether you can see it or not.
At the bottom of the screen, you will see a symbol that looks like this: That symbol consists of a “greater-than” sign with a little line underneath it. That little line is called a cursor. On your keyboard, just above the m key, you will notice two keys with arrows on them. These are the cursor keys. To see how they work, press this cursor key: The cursor moves to the right, but the “greater-than” sign does not move.
Thus, themkeys enable two cursor keys to move the cursor in any of four different directions: left, right, up, and down. To select horizontal movement, do not use alkey. To select vertical movement, you must use alkey. Scrolling Something special happens when you try to move the cursor beyond the edge of the LCD screen. The cursor doesn’t move off the screen; instead, the cursor stays in place and the text on the screen moves in the opposite direction.
Clearing the screen You can erase the entire virtual screen, just by pressing a single key: This clears the virtual screen, and homes the cursor. Typing on the virtual screen Typing on the virtual screen is as easy as...well, as easy as typing. For example, let’s say you want to type the expression, “NOW IS THE TIME FOR ALL GOOD MEN TO COME TO THE AID OF THEIR PARTY.” (Don’t type anything yet.) You’ve just pressed key, so you’re looking at a blank screen, with a cursor in the the upper left corner.
Because the cursor is near the right edge of the screen, something unusual will happen when you type the next character. Press them key. An “O” appears on the screen at the cursor location, but the cursor doesn’t move to the right. Instead, all the text on the screen slides to the left. So the screen will look like this: Type the letter “R” and it happens again! This hardly seems fair: each time you add a character on the right, you lose a character on the left.
already displaying the rightmost portion of the virtual screen. Now, press the key and the screen will look like this: q ALL GOOD MEN TO COM- ' The cursor is now in the rightmost location of the virtual screen. Now, press the key. The screen display changes dramatically: q What happened? An “E” appeared in the virtual screen at the cursor location, and then the cursor advanced to the next location in the virtual screen.
(You will see an error message on the screen if you press piiiJJ now, after typing “NOW IS THE TIME FOR ALL GOOD MEN TO COME TO THE AID OF THEIR PARTY.” Here’s why: Pressing m tells the HX-20 that you have just completed a logical line. The HX-20 is in “BASIC,“ so it examines your line to see if it is a legitimate BASIC command. Since it can’t figure out what you’re asking it to do, it displays an error message. You’ll learn more about such error messages in the BASIC Tutorial and Reference Manual.
(Note: if the cursor is at the beginning of a logical line, then pressing a will not delete the preceding character, but will instead delete the character at the cursor.) You will find the 111 key extremely helpful when you are typing new text. With it, you can correct typographical errors as soon as you make them. Whenever you strike the wrong key, press the II/ key immediately afterwards. That will move the cursor to the left, deleting the incorrect character.
Eventually, you’ll want to stop inserting text. To exit from insert mode, hold down a m key and tap magain. Or press any cursor key. Either action will take the HX-20 out of insert mode. Upper and lower case So far, you’ve only typed UPPER CASE LETTERS on the virtual screen. But with the screen editor, you can type lower case letters, too. To explore the use of upper and lower case letters, begin by clearing the screen.
When the screen editor is in lower case mode, the w keys work the same way they do on a typewriter. Use no m key and you get a lower case letter; use either [ key and you get an upper case letter. To put the screen editor back into upper case mode, simply press the key again. Numeric mode When you use BASIC or run an application program, you may wish to type only numbers, instead of conventional text. You can, of course, type numbers by pressing the numeric keys in the top row of the keyboard.
That’s the same pattern of numbers you’ll find on the keyboard of any calculator or adding machine. When the HX-20 is in numeric mode, you cannot type any letkey. See? Nothing happens. In this ters. (Go ahead. Press the mode, all letter keys are disabled.) The number keys in the top row of the keyboard will also workalthough presumably you put the HX-20 into numeric mode because you’d rather not use those keys. However, the numeric keys will not function if pressed in conjunction with alkey.
Figure 5-1 Screen Editor Modes Graphic characters So far you’ve typed letters, numbers, and punctuation marks, but with the screen editor you may type many graphic characters as well. To generate these graphic characters, the screen editor must be key (located in the in upper case mode, and you must use the lower right corner of the HX-20 keyboard). key, and (while holding it For example, hold down the down) press the key. Instead of seeing a “K” or a “k” on the screen, you’ll see a little musical note.
Printing the screen Now you’ve learned enough to make the LCD screen display text and graphics. At some point, you may decide that you’d like to save a copy of what you see on the screen. You can make a hard copy of the LCD screen whenever you’d like. To do so, you’ll use one of the specialfunction keys. which are located just above the row of numeric keys on your HX-20 keyboard. key To print a copy of the LCD screen, just hold down the (located at the left edge of the keyboard) and press function .
Move cursor right to a multiple of n columns. (Originally n = 10, but n may be changed with the BASIC scroll command.) Clear virtual screen and home the cursor. Home the cursor. Move cursor right by 8 columns. Scroll text up the screen by four lines (or by the amount set with the BASIC SCROLL command.) Scroll text down the screen by four lines (or by the amount set with the BASIC SCROLL command.) Change modes: upper case to lower case, lower case to upper case, or numeric mode to lower case.
Display leftmost portion of virtual screen. Scroll right. Delete from cursor to end of logical line. Move cursor to rightmost portion of virtual screen. Same as q Horizontal tab (8 columns). Move cursor down by one line. (Has no effect in BASIC immediate mode.) Home the cursor. Clear virtual screen and home the cursor. Carriage return. Scroll text down by four lines, or by amount set with BASIC SCROLL command. Scroll text up by four lines, or by amount set with BASIC SCROLL command.
B lets you change the rate at which the HX-20 LIST S a BASIC program on the screen. To change this rate, press w when a program is LISTing on the screen, and then press a key from 0 to 9. 0 sets the slowest LIST rate; 9 sets the fastest LIST rate. Other keys set intermediate LIST rates. lets you see the HX-20 menu. Even if the HX-20 is in BASIC, or is running some program, it will return to the menu if you press the key.
Chapter 6 Connecting your HX-20 to other devices You can connect your HX-20 to a number of other devices-for example, to a cassette recorder, a printer, and a bar code reader, to name but a few. In this chapter you’ll learn how to connect the HX-20 to such peripherals. Connecting your HX-20 to a cassette recorder You can connect your HX-20 to any portable cassette recorder. However, it’s best to avoid the cheapest cassette recorders, because on these units the tape speed can fluctuate dramatically.
At each end of the cable you'll find three plugs, colored red, white, and black.
Your cassette recorder is now connected to your HX-20. You may use it to save and load BASIC programs, as described in the Epson HX-20 BASIC Tutorial and Reference Manual. Or you may use it with various applications programs, as described in the documentation for those programs. One word of caution: all cassette recorders vary, in tape speed and in the position of their record/ playback heads.
Plug the small, rounded end of the RS-232 cable into the DIN socket labelled “RS-232” in the back of your HX-20. Then plug the other end of the cable into the corresponding socket on your RS-232 device. Now the HX-20 and the RS-232 device are connected. In order for them to communicate, however, they must share a common protocol. Two devices may be connected electrically, but never communicate properly, if they don’t share a common communications protocol.
A bar code reader can “read” bar codes-those patterns of black and white stripes you find on groceries, magazines, and so many other products today. As of this printing, Epson has provided only the hardware interface for a bar code reader. But when you read this, a bar code reader might be available. Contact your Epson dealer. If you purchase a bar code reader, be sure to see what software is available for use with it.
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Chapter 7 What if you have problems? Your HX-20 is a highly sophisticated computer, controlled by very advanced software. Epson built reliability into this software, so it’s quite likely that your HX-20 will give you trouble-free service for years. Nevertheless, even the most intelligent systems can become confused. This chapter will show you what to do if your HX-20 fails to work properly. If you can’t turn off your HX-20...
The RESET switch will interrupt the HX-20, no matter how busy it may be. Once interrupted, the HX-20 will notice that the ON-OFF switch is in the “OFF” position, and it will stop processing. This will make the screen go blank. If the menu displays garbage... Symptom: The menu displays garbage-a hodgepodge of letters, numbers, and/ or graphics characters. Cause: The Operating System of the HX-20-the software that controls its menu-has become very confused.
Chapter 8 Storing your HX-20 Because of its sensitive components, the HX-20 requires some care even when you’re not using it. This chapter tells you how to store your HX-20, for a few minutes, a few days, or even a few months. Storing your HX-20...for a few minutes to a few hours If you won’t be using your HX-20 for a few minutes, you don’t need to take any special precautions. You don’t even need to turn it off. Just put it down, and pick it up again when you’re ready to continue working with it.
also be prudent to save on a cassette any programs you have stored in memory. Then store the HX-20 in its original box and packaging materials, in a place with acceptable temperature and humidity.
Chapter 9 Specifications This chapter provides information of interest to technicallysophisticated 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. Architecture The HX-20 has two microprocessors for distributed and concurrent I/O processing.
As shown in Figure 9-1, the main microprocessor accesses readonly and read-write memory, and controls the keyboard, LCD display, and clock. The slave microprocessor controls the microprinter, speaker, and external cassette. The cartridge interface has ports for both the main and slave microprocessors.
Expansion Several options may be easily installed to expand the HX-20’s capability, as shown in Figure 9-2. An expansion unit provides an additional 32K of memory, which includes 16K of RAM. In addition, an 8K application ROM may be installed internally. An option ROM or microcassette cartridge may be installed in place of the dummy cartridge.
Specifications CPU and Memory Main CPU Slave CPU RAM ROM CMOS 8 bit 6301 microprocessor 614 KHz clock rate CMOS 8 bit 6301 microprocessor, 614 KHz clock rate 16K standard 32K standard Internal Expansion ROM 8 K in option ROM for a total of 40 K External Expansion RAM ROM 16K (See “Options”) 32K (See “Options”) Built-in Features Display Printer Clock Speaker Liquid Crystal Display; 120 x 32 dot-addressable matrix; 5 x 7 font; virtual width to 255 characters by BASIC WIDTH command 24-column dot matri
Serial (Full and half duplex) Connector Input/ Output Level Baud Rates Pin Assignment Peripheral Cartridge Connector Input/ Output Level Pin Assignment Cartridge Type ROM Cartridge Not assigned No cartridge Not assigned Microcassette 5-Pin DIN EIA RS-232C standard 150, 600, 4800, 38400 I: GND, 2: TXD, 3: RXD, 4: OUT.
AC Adapter (Battery Charger) Input Voltage Frequency Consumption Isolation Switches Internal External Keyboard and Character Set Type Function Total Number of Keys Function Keys Special Keys Ten Key Numeric Pad Graphic Shift International Character Set Environmental Temperatures Operating Charge Data Integrity Data Storage Humidity Operating/ Non-operating Vibration without Microcassette Shock Physical Characteristics Size Weight Options Cartridge Microcassette Cartridge ROM Cartridge Expansion Unit RAM Ca
CX-20 Acoustic Coupler Communications Operation Mode Signaling Speed Interface Power Supply Display Controller Switch Box RS-232C Cables Serial Cables (High Speed) External Cassette Cable Full/ half duplex, selectable ORIG/ ANS mode, selectable Up to 300 BPS Standard RS-232C 4 NiCad batteries; AC adapter/ charger (1 15V + 10%, 60 Hz); Floating charge with AC adapter H00DC-IA H00SB-JA ** ** H-702 support AC Adapter (Battery Charger) Roll Paper Ribbon Cartridge H00AAA H00RP H00CR-BA (** See your Epson Dea
