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Heath HEATHKIT HA8-8 Manual

Extended configuration board
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HEATHKIT
MANUAL
HEATH COMPANY • BENTON HARBOR, MICHIGAN

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Summary of Contents for Heath HEATHKIT HA8-8

  • Page 1 HEATHKIT MANUAL HEATH COMPANY • BENTON HARBOR, MICHIGAN...
  • Page 2 If a defective part or error in design has caused your Heathkit product to malfunction during the warranty period through no fault of yours, we will service it free upon proof of purchase and delivery at your expense to the Heath factory, any Heathkit Electronic Center, or any of our authorized overseas distributors.
  • Page 3 Heathkit® Manual for the EXTENDED CONFIGURATION BOARD Model HA8-8 595-2509-01 Copyright © 1980 Heath Company HEATH COMPANY All Rights Reserved BENTON HARBOR, MICHIGAN 49022 Printed in the United States of America...

  • Page 4: Table Of Contents

    TABLE OF CONTENTS Introduction..............2 Circuit Description ............ 31 Circuit Board X-Ray View........32 Assembly Notes............3 Integrated Circuit Identification......33 Parts List................ 6 Schematic ............Fold-in Step-by-Step Assembly..........8 Circuit Board Assembly ........8 Warranty.......... Inside front cover Circuit Board Checkout........19 jumper Wire Assembly........

  • Page 5: Assembly Notes

    ASSEMBLY NOTES TOOLS You will need these tools to assemble your kit. HEATHKIT SOLDER I NG IRON *T0 REMOVE SOLDER FROM CIRCUIT CONNECTIONS. ASSEMBLY Follow the instructions carefully. Read the en­ Most kits use a separate “Illustration Booklet” tire step before you perform each operation. that contains illustrations (Pictorials, Details, etc.) that are too large for the Assembly Manual.
  • Page 6 Each circuit part in an electronic kit has its own SOLDERING component number (R2, C4, etc.). Use these numbers when you want to identify the same Soldering is one of the most important operations you part in the various sections of the Manual. These will perform while assembling your kit.
  • Page 7 Heathkit* PARTS —=G=D=— 1/4-WATT Resistors are identified in Parts Lists and steps by their resistance value in ft (ohms), kft (kilohms), or Mft (megohms). They are usually identified by a color 1/2-WATT code and four or five color bands, where each color represents a number.

  • Page 8: Parts List

    Do not discard the rear cover. Your Warranty is located inside the any packing material until all parts are accounted for. front cover. For prices, refer to the separate “Heath Parts Price List.” KEY HEATH QTY.
  • Page 9 Heathkit PARTS PICTORIAL ALWAYS IDENTIFY AN I.C. BY THE PART NUMBER OR TYPE NUMBER NOTE: THE STYLE MAY BE SLIGHTLY DIFFERENT THAN SHOWN.

  • Page 10: Step-By-Step Assembly

    STEP-BY-STEP ASSEMBLY CIRCUIT BOARD ASSEMBLY CONTINUED ( ) Solder the resistor leads to the cir­ STARTS cuit board as follows ( ) In the following steps, you will be Push the soldering iron tip given detailed instructions on against both the lead and the how to install and solder the first circuit board foil.
  • Page 11 A GOOD SOLDER CONNECTION ------------------------------------------------------------------------, SOLDER FLOWS OUTWARD AND GRADUALLY BLENDS • When you heat the lead and the circuit board foil at the same time, the solder will flow evenly onto the lead and the foil. The solder will make a good electrical connection between ^the lead and the foil.
  • Page 12 STARTS ( ) Make sure you installed resistor R5 in Pictorial 1-1. CONTINUED ( ) Cl: .01 p.F (103) ceramic ( ) R12: 1000 fl (brn-blk-red). capacitor. NOTE: Ceramic capacitors may be in­ ( ) R2: 220 fl (red- red-brn). stalled either way in the circuit board.
  • Page 13 Heathkit* STARTS You will install IC sockets in the fol­ lowing steps. Be sure the socket pins are straight and then install the socket on the circuit board so the index mark CONTINUED on the board can still be seen. Turn the circuit board over, be sure there is a pin ) Pl: 3-pin plug.
  • Page 14 CONTI NU EO ) SW1: 8-section slide switch. STARTS Mount the switch so the numbers 0 through 7 are away from integ­ ( ) Cut eight 1" lengths of bare wire. rated circuit U1 as shown. Then Use these 1" bare wires in the fol­ solder the lugs to the foil and cut lowing steps.
  • Page 15 Heathkit NOTE: The pin 1 end of inline inte­ grated circuits may be marked in a number of ways; with a notch, triangle, dot, the numeral 1, etc. SHALL INBEMTATIOM CONTINUED ( ) U6: 7438 integrated circuit (#443-77). PIN 1 ( ) U5: 74LS30 integrated circuit Be sure you install each of the follow­...
  • Page 16 PICTORIAL 1-6 NOTE: You may have been supplied two 6-pin and Push the socket onto the edge of the circuit two 20-pin sockets or two 26-pin sockets. Use the board next to the data jumpers. steps that match your sockets. Make sure the circuit board is between the 26-PIN SOCKETS two lugs at each socket connector.
  • Page 17 Heathkit Detail 1-6B Adjust the sockets as necessary so they are Locate the 25-pin plug. Then refer to Detail 1-6B parallel to the circuit board. Then solder all the and push the longer pins of the plug into the socket lugs to the circuit board (both sides). two 26-pin sockets so that about half of the plug pins are in each socket.
  • Page 18 6-PIN AND 20-PIN SOCKETS Push the prepared 6-pin socket onto the edge of the circuit board next to the 20-pin socket. Make Refer to Pictorial 1-7 for the following steps. sure the circuit board is between the two lugs at each socket connector.
  • Page 19 Detail 1-7B Refer to Detail 1-7B and cut off the indicated Locate the 25-pin plug. Thenreferto Detail 1-7C and push the longer pins of the plug into the lugs at one end of the remaining 20-pin socket. four sockets as shown. Push the prepared 20-pin socket onto the edge Check the four sockets to make sure the edges of of the circuit board next to the 6-pin sockets.
  • Page 20 PICTORIAL 1-8 Refer to Pictorial 1-8 for the following steps. Position the circuit board as shown in Pictorial 1-9 with the component side away from you. Locate the two polarizing plugs. Then push the plugs into the holes of the 26-pin sockets where Carefully peel the backing paper from the re­...

  • Page 21: Circuit Board Checkout

    Heathkit* PICTORIAL 1-10 CIRCUIT BOARD CHECKOUT JUMPER WIRE ASSEMBLY Carefully inspect the circuit board for the following Refer to Pictorial 1-10 for the following steps. conditions: Remove 1/4" of insulation from one end and 1/8" Unsoldered connections. of insulation from the other end of a 12" red wire.

  • Page 22: Installation And Operation

    Computer] is in the OFF position. you have with the Heath Company about your kit. This assures you that you will receive the most com­ Unplug the Computer’s line cord.

  • Page 23: Initial Tests

    Make sure the Extended Configuration Board is INITIAL TESTS installed. Then turn the Computer on and check the voltage at Xl on the CPU. It should measure The following tests will check the construction of 5 volts DC. your Extended Configuration Board for errors. It will also check the mother circuit board in your Computer If you obtained the proper voltage, proceed to for solder bridges on some of the bus lines which were...
  • Page 24 NOTE: The following sections describe the three If you obtained the proper results, proceed to functions available with the Extended Configuration “Test #5.” Board and some modifications that you must make to other circuit boards in your H8. Read all of the infor­ If you did not obtain the proper results, check mation before you actually perform any of the modifi­...

  • Page 25: Status Port

    STATUS PORT The status port is interrogated by version 2.0 (or later) HDOS as well as by Heath CP/M. This can be used to determine the system configuration upon bootup without requiring any user interaction. Some user programs may also interrogate the status port.

  • Page 26: Rom Disable (Org 0)

    ROM DISABLE (ORG 0) To use the ROM disable function, make the following modifications to the circuit boards in your H8 compu­ The ROM disable function is normally used with the ter. CP/M operating system. Since the system RAM must be a continuous block originating at zero instead of Remove the tie bracket from your Computer.
  • Page 27 PICTORIAL 2-4 Refer again to the inset drawing and carefully Refer to Pictorial 2-4 for the following steps. unsolder or cut the leads of resistor R6 (68 ft, blu-gry-blk). This resistor will no longer be NOTE: Be careful not to damage any circuit board used.
  • Page 28 Cut the following lengths of green wire. Then Refer to Pictorial 2-5 for the following steps. remove 1/4" of insulation from the ends of each wire. Carefully unsolder or cut the following jumper wires: 1-1/2" Wire between holes Tl and T2. 2-3/4"...
  • Page 29 NOTE: The integrated circuit that you will install in the next step is a rugged and reliable component. However, normal static electricity discharged from your body through an integrated circuit pin to an object can damage the integrated circuit. Read the entire instruction first.

  • Page 30: Side Select

    Remove the tie bracket from your Computer. The side select function allows you to use double­ Carefully unplug the CPU circuit board from sided disk drives with your Computer. NOTE: Heath your Computer. systems software does not support double-sided drives at this time. This feature is only provided for...
  • Page 31 PICTORIAL 2-8 S103 on your controller circuit board. Connect NOTE: If you are using any non-Heath circuit boards the other end of the wire to the foil at pin 18 of in your Computer, be sure to check these boards to socket S102 on your controller circuit board.

  • Page 32: Modification Tests

    Refer to Pictorial 2-9 for the following steps. MODIFICATION TESTS Position the controller circuit board as shown The following test will check the modifications that in the Pictorial. you made on your CPU circuit board. To make these tests, you should have only the following plug-in Locate the jumper wire assembly you assem­...

  • Page 33: Circuit Description

    CIRCUIT DESCRIPTION ROM DISABLE Refer to the Schematic (fold-in) while you read the following “Circuit Description.” The following Latch U3A and buffer U6D generate the ROM DIS­ paragraphs are grouped according to the various cir­ ABLE signal. If data bit D5 is low and a write is cuits on the circuit board.

  • Page 34: Circuit Board X-Ray View

    CIRCUIT BOARD X-RAY VIEW NOTE: To find the PART NUMBER of a component Adjacent to the circuit component number, you for the purpose of ordering a replacement part: will find the PART NUMBER and DESCRIP­ TION which must be supplied when you order a Find the circuit board number (R5, C3, etc.) on replacement part.

  • Page 35: Integrated Circuit Identification

    Heathkit3 INTEGRATED CIRCUIT IDENTIFICATION CIRCUIT MAYBE HEATH LEAD CONFIGURATION REPLACED DESCRIPTION COMPONENT PART (TOP VIEW) NUMBER 5-volt regulator 7805 442-54 Tri-state 74LS240 443-754 inverting buffer 2CLR 1CLR Hex inverter 74LS04 443-755...
  • Page 36 Integrated Circuits (cont’d.)
  • Page 37 Heath Electronic Cen­ ters Be certain to include the HEATH part number exactly as it Please do not send parts for testing, unless this is specifi­ appears in the parts list.
  • Page 38 HEATH HEATH COMPANY • BENTON HARBOR. MICHIGAN THE WORLD’S FINEST ELECTRONIC EQUIPMENT IN KIT FORM...

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