SWTPC DC-4 Manuel utilisateur

SWTPC Minifloppy Disk Unit

Introduction

The SWTPC minifloppy disk unit is a dual drive, double sided, five-inch disk

unit. Double density operation is also available when using the DC-4 disk

controller board. The disk unit was designed specifically for the SWTPC 6809

computer. Although the disk unit was completely assembled and tested at the

factory, minor reprogramming of the circuit board may be necessary to operate with

your particular computer system. It is suggested that this instruction manual be

read completely before attempting to use the unit.

Jumper Programming the DC-4 Controller Board

There are five Jumper blocks on the DC-4 controller board that must be

properly programmed before the board is installed in the computer. Programming is

achieved by plugging the small plastic blocks onto the specified set of programming

pins.

( ) There are two Jumper locations near the bottom of the board marked 4/16. This

Jumper selects the number of address locations assigned to each I/0 port. If

your computer uses the earlier MP-B or MP-B2 motherboard, RESET switch on

RIGHT side of chassis, put the Jumpers in the 4 position. All other computer

installations should have the Jumpers in the 16 position.

( ) If you will be using the disk unit with a 6800 (not 6809) processor board or a

6809 using FLEX 2.5 or earlier, install the Jumper in the 00 position. All

other installations should have the Jumper in the 09 position.

( ) Unless specifically noted with a particular piece of software, both the IRQ

and FIRQ Jumpers should be in the NORM (OFF) positions or removed completely.

Interrupts are presently not used with this board.

Scanned and edited by Michael Holley Oct 23, 2000 [email protected]

Southwest Technical Products Corporation Document Circa 1978

Installation

( ) In order for the MF-69 to work properly with an SWTPC 6800 or 6809 computer

with an MP-B or MP-B2 (not MP-B3 or MP-MB) motherboard, one minor

modification needs to be made to the motherboard. With a short length of wire

connect together each of the two end pins of 30-pin I/0 connector row #5.

This will connect the #5 port select line to UD3. When connecting the wire,

route it around the PC support on the bottom of the board to prevent it from

being pinched. Re-install the motherboard when finished. This modification

should be done only on MP-B or MP-B2 motherboards.

( ) The disk controller board should now be plugged on to !/0 slot 6 on computers

with MP-B or MP-B2 motherboards or I/0 slot 1 on computers with MP-MB or

MP-B3 motherboards. The lower edge of the controller board may need to be

notched slightly for insertion in certain older chassis.

( ) Connect the ribbon cable to the connector on the controller board. Route the

cable thru a hole in the rear of the computer or as desired. If the connector

supplied on the cable does not have an indexing pin, install the connector so

that the cable extends toward the back of the board. The pin 1 side should be

nearer the front edge of the board when installed in the computer. When the

controller board utilizes a connector that faces the rear of the computer,

connect the cable such that the pin 1 side of the cable (banded side) goes

toward the 1 marked on the rear mounting panel (toward the top of the

computer).

( ) Double check to be sure the cable is installed securely on the drives. All

cables should be installed as in the following pictorial. By running the

cable through the hole in the rear of the chassis the only natural way for

the connectors to fit will be the right way, as shown. Be very careful that

the cable is installed correctly--incorrect installation can cause damage to

the controller and the drives.

( ) This completes the interconnection of the disk and the computer. The disk

unit is now ready for checkout/

Checkout and Use

( ) Be sure that your computer contains enough memory to run the disk operating

system that you are using. The software manual supplied with the diskette

should specify the amount of memory required.

( ) After connecting the disk unit is ready for use. If at any time the disk

fails to operate as described, power down the system and recheck all

assembly.

( ) Power up the disk unit and computer. The power switch for the disk unit is on

the back panel. The switch is ON when the paddle on the switch is toward the

right as viewed from the front.

( ) Write protect the system diskette by placing a small piece of tape around the

square notch on the side of the diskette.

( ) This completes the interconnection of the disk and the computer. The disk

unit is now ready for checkout.

( ) Install the diskette into DRIVE 0 (left drive) so that the write protect

notch is at the bottom. Be sure to close the door on the drive.

( ) Type in the minifloppy disk boot character on your terminal. Check your

computer's monitor documentation for the correct character. If the disk unit

does not respond, recheck each step of this instruction set then refer to the

IN CASE OF PROBLEMS section - of this manual.

Using the Disk Unit

The minifloppy disk unit is designed to be as straightforward and easy to use

as possible. There are certain things that the user must be aware of, however, for

correct operation.

All memory in the computer must be operational for the disk to operate

properly. If any doubt exists, run the memory diagnostics to verify correct

operation.

Diskettes should always be inserted with We WRITE PROTECT notch nearest the

LED'S on the drive and with the label outward. Having this notch closed with a

piece of tape will prevent the disk from being written upon. Leaving the notch open

will allow write privileges.

The LED indicators on the front of the drives are drive select lights and are

activated only when the particular drive is selected. They are not power

indicators.

The disk controller has been designed to select the drive and turn on the

drive motors only when necessary. When the computer requests data from the disk,

the motors will activate and the correct drive will select. After the information

has been retrieved the drive will deselect, and after approximately one minute the

motors will turn off.

NOTE: Some versions of the disk operating system will keep a drive selected

after an operation is finished. This is a normal condition.

Just like cassette tapes, diskettes are made of magnetic materials and can be

era by stray magnetic fields. Also, it is an excellent idea to back up all

important disks on a spare diskette. The following precautions should be followed

concerning diskettes:

1. Return the diskette to its storage envelope whenever it is removed from a

drive.

2. Keep diskettes away from magnetic fields and from ferromagnetic materials

which might become magnetized. Strong magnetic fields can distort recorded

data on the disk.

3. Replace storage envelopes when they become worn, cracked or distorted.

Envelopes are designed to protect the disk.

4. Do not write on the plastic jacket with a lead pencil or ball point pen. Use

a felt tip pen.

5. Heat and contamination from a carelessly dropped ash can damage the disk.

6. Do not expose ................diskettes to excessive heat or sunlight.

7. Do not touch or attempt to clean the disk surface. Abrasions may cause loss

of stored data.

With MP-B and MP-B2 motherboards the disk unit uses the ENABLE line from I/0

position 5 as a control line. Care should be exercised when using I/0 slot 5 for

other devices.

IMPORTANT: Do not power the computer or disk units on or off while diskette

are installed in the drives with the doors closed. Doing so may destroy any or all

the data stored on the diskette(s).

IN CASE OF PROBLEMS

If your disk unit fails to operate properly we suggest that you first go back

and double check all programming and installation steps. An improperly installed or

incorrectly programmed board can cause anything from intermittent operation to no

operation at all. Also if your system diskette has been damaged the unit will not

function properly. If the drive 0 select light does not come on and/or the drive

motors do not start, then a hardware problem should be suspected. Service of the

minifloppy disk unit should be left to competent technical personnel.

Factory Exchange Service Plan for Assembled Units Only

Southwest Technical Products Corp. provides an exchange program for factory

assembled products and product subassemblies which require service. The plan is

designed to provide a way of returning systems to operational status as quickly as

possible.

All equipment is registered in the plan for a period of six months after

installation. After this time an exchange charge is made, if the equipment has not

been placed under service contract.

Any article to be returned to the factory must be properly packed and marked

with a return address. This should include the name and telephone number of the

person requesting the repair. The nature of the problem should also be described as

fully as possible.

The serial number of the system from which any subassembly was removed must

be supplied with the returned subassembly.

Ship all articles to be returned to the factory prepaid by UPS or insured

parcel post. We cannot pick up repairs sent by bus. No COD shipments can be

accepted. Articles will be returned prepaid. Upon receipt of a repairable,

defective article and payment covering the cost of the article exchange, Southwest

Technical Products Corp. will ship a new or equivalent-to-new performance exchange

article.

Exchange articles will be placed under a six-month exchange plan at no

additional cost, just as new equipment.

EXCHANGE CHARGES

DC-4 Controller board and cable ............$40.00

Power supply ............................... 20.00

Disk drive ........... depends on individual drive

Ship to: Southwest Technical Products Corporation

Repair Dept. - Digital Group

219 W. Rhapsody

San Antonio, Texas 78216

Drive Programming'

Drive programming on assembled units has been done at the factory. The

following is supplied for the convenience of technical personnel.

Programming Shugart, Siemans or Wangco Drives.

Carefully remove both drives from their boxes and turn the drives so that the

edge connectors are nearest you and so that the belt and pulleys are on the bottom.

( ) At the bottom left corner of the board you will notice what looks 1ike an IC

made up jumpers in a socket. On one of the drives remove the jumper block

with a screwdriver and bend upward (straight) the pins that go to terminals

DS2, DS3 and MX. Do not break these pins off. Reinstall the jumper block into

the socket. As a double check the jumper block should have pins inserted only

in terminals DS1, HS and the unlabeled pin. There should be nothing plugged

into the HM position. This drive is now programmed as DRIVE 0.

( ) On the other drive, bend straight out the pins going to DS1, DS3 and MX.

Re-install the jumper so that HS, DS2 and the unlabeled pin have jumper pins

installed.

( ) Directly above this jumper block you will notice what appears to be a 14-pin

IC in a socket. This is not an IC but is an array of pull-up resistors.

Carefully remove this array from its socket using a small screwdriver. This

array should not be reinstalled. This drive is now programmed as DRIVE 1.

Programming Qume Drives

( ) At the bottom left corner of the board you will notice what looks like an IC

made up-of jumpers in a socket. On one of the drives remove the Jumper block

with a screwdriver and bend upward (straight) the pins that go to terminals

DS1, DS2, MX, DS3 and HM. Do not break these pins off. Reinstall the Jumper

block into the socket. As a double check, the Jumper block should have pins

inserted only in terminals DSO and HS. This drive is now programmed as DRIVE

( ) On the other drive, bend straight out the pins going to DSO, DS2, MX, DS3 and

HM. Re-install the Jumper so that HS and DS1 pins have Jumper pins installed.

( ) Directly above this Jumper block you will notice what appears to be a 14-pin

IC in a socket. This is not an IC but is an array of pull-up resistors.

Carefully remove this array from its socket using a small screwdriver. This

array should not be re-installed. This drive is now programmed as DRIVE 1.

Programming Tandon Disk Drives

Carefully remove both drives from their boxes an turn the drives so that the

edge connectors are nearest you and so that the belt and pulleys are on the bottom.

( ) At the bottom left corner of the board you will notice what looks like an IC

made up of jumpers in a socket. On one of the drives remove the jumper block

with a screwdriver and bend straight (upward) the pins shown below. Do not

break these pins off. Re-install the jumper block as shown. This drive is now

programmed as DRIVE 0.

( ) On the other drive, bend straight out the pins of its jumper block as shown

below. Re-install it as shown.

( ) Located on this drive below and to the right of the jumper block you will

notice what appears to be an IC in a socket. This is an array of pull-up

resistors and should be removed. This drive is now programmed as DRIVE 1.

Parts List -- DC-4 Minifloppy Disk Controller

Resistors

____ R1 10K ohm 1/4 watt resistor ____ R10 150K ohm 1/4 watt resistor

____ R2 56K ohm " ____ R11 4.7M ohm " "

____ R3 75K ohm " ____ R12 33 ohm "

____ R4 150 ohm " ____ R13 47K ohm "

____ R5 150 ohm " ____ R14 47K ohm "

____ R6 150 ohm " ____ R15 100K ohm potentiometer

____ R7 150 ohm " ____ R16 50K ohm potentiometer

____ R8 10K ohm " ____ R17 10K ohm 1/4 watt resistor

____ R9 100K ohm " ____ R18 10K ohm

Capacitors

____ *C1 4.7 mfd tantalum

electrolytic capacitor ____ *C11 1 mfd electrolytic

capacitor

____ *C2 4.7 mfd tantalum

electrolytic capacitor ____ C12 0.1 mfd capacitor

____ C3 0.1 mfd capacitor ____ C13 100 pfd capacitor

____ C4 0.1 mfd capacitor ____ C14 0.1 mfd Capacitor

____ C5 0.1 mfd capacitor ____ C15 0.1 mfd Capacitor

____ C6 20 pfd capacitor ____ C16 0.01 mfd film capacitor

____ C7 0.1 mfd capacitor ____ C17 0.33 mfd tantalum

capacitor

____ *C8 220 mfd @10 VDC

electrolytic capacitor ____ C18 56 pfd poly capacitor

____ C9 0.1 mfd capacitor

electrolytic capacitor ____ C19 0.1 mfd capacitor

____ C10 0.01 mfd film capacitor

0.02 ____ C20 0.1 mfd capacitor

Integrated Circuits

____ *IC1 1797 disk controller (MOS) ____ *IC9 74LS244 octal buffer

____ *IC2 14541 timer (MOS) ____ *IC10 74LS32 quad OR gate

____ *IC3 74LS123 dual one shot ____ *IC11 74LS132 quad 2 input NAND

gate

____ *IC4 74LS244 octal buffer ____ *IC12 4049 hex inverter (MOS)

____ *IC5 74LS139 dual 2 to 4

decoder ____ *IC13 7805 5-volt regulator

____ *IC6 74LS124 VCO ____ *IC14 78L12 12-volt regulator

____ *IC7 74LS240 octal inverter ____ *IC15 1691 Data separator

____ *IC8 74LS175 quad D-flop ____

Miscellaneous

____ Y1 1.0 MHz crystal

2.0

* All components flagged with a * must be oriented as shown in the component

layout drawing.

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