3Com 4 manual

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A good user manual

The rules should oblige the seller to give the purchaser an operating instrucion of 3Com 4, along with an item. The lack of an instruction or false information given to customer shall constitute grounds to apply for a complaint because of nonconformity of goods with the contract. In accordance with the law, a customer can receive an instruction in non-paper form; lately graphic and electronic forms of the manuals, as well as instructional videos have been majorly used. A necessary precondition for this is the unmistakable, legible character of an instruction.

What is an instruction?

The term originates from the Latin word „instructio”, which means organizing. Therefore, in an instruction of 3Com 4 one could find a process description. An instruction's purpose is to teach, to ease the start-up and an item's use or performance of certain activities. An instruction is a compilation of information about an item/a service, it is a clue.

Unfortunately, only a few customers devote their time to read an instruction of 3Com 4. A good user manual introduces us to a number of additional functionalities of the purchased item, and also helps us to avoid the formation of most of the defects.

What should a perfect user manual contain?

First and foremost, an user manual of 3Com 4 should contain:
- informations concerning technical data of 3Com 4
- name of the manufacturer and a year of construction of the 3Com 4 item
- rules of operation, control and maintenance of the 3Com 4 item
- safety signs and mark certificates which confirm compatibility with appropriate standards

Why don't we read the manuals?

Usually it results from the lack of time and certainty about functionalities of purchased items. Unfortunately, networking and start-up of 3Com 4 alone are not enough. An instruction contains a number of clues concerning respective functionalities, safety rules, maintenance methods (what means should be used), eventual defects of 3Com 4, and methods of problem resolution. Eventually, when one still can't find the answer to his problems, he will be directed to the 3Com service. Lately animated manuals and instructional videos are quite popular among customers. These kinds of user manuals are effective; they assure that a customer will familiarize himself with the whole material, and won't skip complicated, technical information of 3Com 4.

Why one should read the manuals?

It is mostly in the manuals where we will find the details concerning construction and possibility of the 3Com 4 item, and its use of respective accessory, as well as information concerning all the functions and facilities.

After a successful purchase of an item one should find a moment and get to know with every part of an instruction. Currently the manuals are carefully prearranged and translated, so they could be fully understood by its users. The manuals will serve as an informational aid.

Table of contents for the manual

  • Page 1

    EPSON Progression 4 power (SPEED) hard disk diskette power light access light drive button Memory bay for hard disk, diskette, tape, CD-ROM, or other drive ROM Video RAM Shadow RAM Cache 115/230 VAC switch . option card slots powei keyboard inlet port I mouse pod drtal - port1 selial VGA pofl2 monitor paral’d port pod Virtual Cache Math coproce[...]

  • Page 2

    EPSON Progression 4 Serial Keyboard Mouse Option slots Speaker Alternate VGA Mass Storage Horizontal mounts Vertical mount Diskette drives Hard disk drives Other devices Two RS-232C, programmable, asynchronous interfaces built into main system board; port assignment and I/O addresses selectable through SETUP; 9-pin, D-shell connectors PS/2 compatib[...]

  • Page 3

    EPSON Progression 4 Extended VGA Modes Major Subassemblies Mode 60 61 62 64 65 6A/70 72 1024x766 main system J1 5-JQ option board board riser card I power supply 16 170Hz ‘” 16 60 Hz 70 Hz 72 Hz 75 Hz 256 60 Hz 73 Hz 256 56 Hz 60 Hz 79 640 x 480 NI --. NI 7c 800x600 NI = Non-interlaced I = Interlaced Wingine Modes Mode 30 Size 640x480 800x600[...]

  • Page 4

    EPSON Progression 4 Main System Board Diagram alternate VGA feature - connector VGA video parallel serial 2 serial 1 mouse keyboard , , PI nl In In w 108 1 --3 1 ll u109 l-l 0 u91 UE El 131 I 0 u97 El 103 n u9e u El 102 0 u99 El 100 0 U99 r-l u90 ml u75 u53 ml u77 US3 ml ue1 us5 an UBO u54 ul U76 u57 ul u79 US8 m-l u79 u59 q u37 17 UBO 0 US1 0 us2 [...]

  • Page 5

    Connector Pin Assignments Parallel Port Connector (CN5) pin 13 pin 1 I I ~oooooooo~oo~ pin 25 pin 14 Parallel Port Connector Pin Assignments Pin 1 Signal 1 Pin 1 Signal 1 Pin 1 Signal 1 Strobe 2 Data 0 10 ACK’ 19 Signal ground 11 Busy 20 Signal ground 3 Data 1 12 PE 21 Signal ground 4 Data 2 13 Sd%t 22 Signal ground 5 Data 3 14 Auto’ 23 Signal [...]

  • Page 6

    Hardware Interrupts System I/O Address Map Hex address* Assigned device 000-OlF DMA controller 1, 8237A-5 020 - 021 Interrupt controller 1, 8259A, master 022 - 024 i Epson resewed function 040-043 Timer, 8254-2 080-081,084 8042 (Keyboard and mouse) 070 - 071 (CMOS) Real-time clock NMI (non-maskable interrupt mask) 080-08F DMA page register, 74LS812[...]

  • Page 7

    Processor Chips EPSON Progression 4 Hard Disk Drive Types If you have the 4SX/33 system, you can install an Intel OverDrive processor (ODP486-33) or a 487SX/33 microprocessor (with built-in math coprocessor) on the main system board. Installing an OverDrive processor effectively doubles the internal clock speed of the computer’s microprocessor; f[...]

  • Page 8

    EPSON Progression 4 If the computer has an Epson 120MB or 240MB hard disk drive, select the appropriate type number from the table below. Epson Hard Disk Drive Types Type number Epson hard disk drive 39 120MB 34 240MB Installation/Support Tips Power The computer has an input voltage selection switch on the back panel to select between 115V, for USA[...]