SWTPC DMF2 User manual

IMPORTANT
NOTE
Although every effort has been made to mh
as possible, Southwest Techni
tion reserves the right to rev’
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SWTPC MODIFICATION -- APPLICATION NOTICE AN #120
Product: DMAF2 QUMEDT-8 Disk Drives
Date: July 16, 1980 G.K.
Unpacking and Packing Qume DT-8 Disk Drives
When unpacking your Qume DT-8 disk drives, it is very important
that you save all of the disk drive packing materials. These materials
include the cardboard insert to protect the disk drive head, the
styrafoam block which holds the door closed, the plastic bag dust cover,
the inner cardboard container, the foam packing inserts and the shipping
container. These materials must be used to repack the drive should it
ever be necessary to reship the drive or return the drive to the factory
for service. Packing the drive in acontainer other than the one
supplied or not properly preparing the drive for shipment can result in
costly damage to the drive and/or the drive head. Neither SWTPC, the
drive manufacturer, or the carrier will be responsible for such damage.
To repack aQume DT-8 disk drive for shipment, first unplug the
DMAF2 chassis from the AC wall receptacle. Disconnect all cables
attaching to the disk drive. Remove the four screws holding the disk
drive to the chassis and carefully remove the drive.
Open the disk drive door and carefully insert the cardboard disk
head protector so tab on the protector is fully inserted into the drive.
Now carefully close the door. Set the styrafoam block against the upper
back side of the drive's front panel and tape it in place. This block
prevents the door from being opened once the drive is placed inside the
inner cardboard container. Carefully place the drive inside the plastic
bag dust cover and secure with tape. Now slide the back side of the
drive into the inner cardboard container until only the front panel of
the disk drive is exposed.
Make sure that you have afoam insert properly positioned in the
bottom of the shipping container. Carefully set in the packed drive
oriented so the drive has its bottom side down. Now place the remaining
foam insert on the top of the drive assembly.
If the disk drive is being returned for factory service, be sure to
include documentation describing the problem with the drive and if
possible, documention confirming the date of purchase. Drives returned
to SWTPC should be addressed as follows:
Southwest Technical Products Corp.
Atten: Service Dept.-- Digital Group
219 W. Rhapsody
San Antonio, Texas 78216

DMAF2
Floppy Disk Unit
Introduction
___, The Southwest Technical Products Corporation DMAF2 is adual drive,
Single and double density, double sided eight-inch disk unit. The DMAF2
is designed to operate with the SWTPC SS-50 bus computer systems.
Although the DMAF2 jis designed to operate with two drives, up to four
drives may be used with aspecial daisy chained interconnection cable.
Although the DMAF2 Disk Unit was completely assembled and tested at
the factory, slight reprogramming of the circuit board may be necessary
to operate with your particular computer system. Also, the disk drives
may need to be installed in the chassis. It is suggested that this
instruction manual be read completely before attempting to use the
system. Step-by-step instructions are given for configuring the unit for
your particular system to minimize the possiblity of errors.
Disk Drive Installation
The two disk drives for the DMAF2 were probably shipped in their
original containers rather than being attached to the chassis.
Carefully remove each drive from its shipping container. One drive
should be clearly marked with a0and the other with a1. The drive
marked 0should be installed in the chassis so that it is the left drive
(as viewed from the front). Before attaching drive 0to the chassis,
install the 50-pin ribbon cable connector to its mate on the drive as
shown in the DMAF2 wiring pictorial. Be sure the connector is installed
so that the side of the cable with the colored band is facing toward the
drive motor as shown in the pictorial. The drive marked 1should have
an extra wire with aconnector on the end attached to the bottom circuit
board of the drive. When installing this drive be sure the wire and
connector extends out from the back of the drive so that it may be
connected to its proper mate on the motor control board. Both drives
should be securely fastened to the chassis using the #8 -32 screws
supplied.
Once the drives have been fastened to the chassis the power and
control cables should be installed. Although all connectors are indexed
and can only be installed one way, the step-by-step procedure should be
followed to avoid any errors. The wiring pictorial should be used to
aid in connecting the cables.
()Be sure that the DMAF2 is not connected to the power line.
()Connect the longer of the two AC cables from the motor control
board to its respective socket on drive 0. Be sure the connector
seats firmly in the socket.
()Connect the other AC cable to its socket on drive 1.
()Connect the longer DC cable to its respective socket on drive 1.
-1-

This connector is indexed and can only be installed one way.
()Connect the remaining DC cable to its socket on drive 0.
()Connect the motor control cable to its respective socket on the
motor control board. Be sure the connector is installed so that
the indexing pin in the female portion mates with the clipped or
removed connector pin on the board.
()Install the 50-pin ribbon cable connector on drive 1as_ shown in
the pictorial. This connector should also be installed so that
the banded side of the ribbon cable is nearest the disk drive
motor.
()Route the ribbon cable connector thru the slot along the top edge -
of the rear panel and install the cover using the #8 -32 black
screws supplied with the unit.
Programming the DMAF2 Controller Board
Before installing the DMAF2 controller in your computer system the
jumper options on the board need to be set properly. DO NOT, however,
change the adjustment of the three controls near the top of the board.
These were pre-set at the factory and should only be adjusted by
qualified service personnel. Jumper changes are accomplished by moving
the small (probably blue) jumper blocks which look like smajl
connectors. Acomplete description of each jumper position is given in
the DMAF2 Controller Board Jumpers section of the computer system
documentation manual (if applicable). In most cases the short table on
the following page may be used to configure the board for your
particular system. Make any jumper changes necessary.

DMAF2 Disk Unit Jumper Requirements
The following tables show the jumper settings to be used with the
DMAF2 double density disk controller in various system configurations.
In addition to the DMAF2 jumpers, some changes may be required to the
MP-09 processor board jumpers.
Table 1.1 -- DMAF2 Jumpers
DMAF
Jumper "S$"Systems Non "S" Systems (69A, 69K)
Halt/Bus REQ Bus Req Bus Req
Upper/Lower |Lower Lower
BA /BA&BS BA&BS BA&BS
IRQ/Norm |
Norm* Norm
2MHz/1 MHz tt tt
Precomp/Norm Precomp Precomp
MR/Norm MR MR
56K/32K 56K 56K
Desel/Sel Sel Desel
Address Select. 44
|
Table 1.2 -- MP-09 Jumpers
6809 Jumper "S" Systems Non "S" Systems (69A, 69K)
BA /BA&BS BA BA
110/BR BR BR
28/3S 3S 2S
tt Set to System Clock
*Set to IRQ for UniFLEX© operation

Installing the DMAF2 Controller Board
Now that the DMAF2 controller board has been jumper programmed
correctly it may installed in the computer. Most users should follow
the instructions given in the system documentation manual of the
computer. For other users be sure that power to both the disk and the
computer is off before installing the controller. Before installation
it is suggested that all memory in the system be checked for proper
operation. SWTPC computer systems require no special modifications, but
at least 20K of memory should be installed in the computer. The DMAF2
board should be installed in any of the un-used 50-pin card positions in
the computer. The remaining end of the 50-pin ribbon cable coming from
the disk drives should now be connected to the 50 pin connector on _the
DMAF2 board. The cable connector is indexed and can only be installed
one way.
This completes the installation of the DMAF2 disk system. The disk
may now be used as described in the Operating Instructions section of
this instruction set.

SWIPC DMAF2 Disk Unit OperatingInstructions
The DMAF2 Disk Unit is designed to be as straightforward and easy
to use as possible. The DMAF2 has only one operator control on it--the
power switch. This switch is located on the rear of the chassis and is
easily accessible to the user when used ‘in table top configurations.
When installed in aSWTPC desk, it should be left in the ON position.
Power is then controlled by the switch installed on the desk.
Loading Flexible Disks
Toload aflexible disk, simply depress
the pushbutton located on
the center of the front panel. The loading handle is spring loaded and
will then expose the load aperture.
Insert the flexible disk in the load aperture with the label toward
the operator and facing the loading handle (see figure). Be sure that
the flexible disk is inserted fully within the drive.
EJECT =
BUTTON
Write ProtectOption
Having the write protect notchon adiskette closed with apiece of
tape will allow the diskette to be written on. Leaving the notch open
will disable write privileges.
WRITE-ENABLE
[oe STICKER
OF
if Q4

The LED's on the drives are drive select/head load lights and are
activated only when the head for aparticular drive is loaded on a
diskette. They are not power indicators.
The disk controller has been designed to load the head and turn on
the drive motors only when necessary. When the computer requests data
from the disk, both motors will activate and the correct head will load.
After the information has been retrieved the head will unload and both
motors will turn off approximately 60 seconds thereafter.
Just like cassette tapes, diskettes are made of magnetic materials
and can be erased by stray magnetic fields. It is an excellent idea _to
back-up all important disks on spare diskettes. The following
precautions should be followed concerning diskettes:
1. Return the diskette to its storage envelope whenever it is
removed from adrive.
2. Keep diskettes away from magnetic fields and 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 alead pencil or ball
point pen. Use afelt tip pen.
5. Heat and contamination from acarelessly dropped ash can damage
the diskette.
6. Do not expose diskettes to heat or sunlight.
7. Do not touch or attempt to clean the disk surface. Abrasions
may cause loss of stored data.
8. Flexible disks must be in the same temperature-and humidity
environment as the disk drive for aminimum of 5 minutes before
installing the diskette in the disk drive. These environmental
requirements are as follows:
Temperature 50° F(10° C) to 80° F(27° C);
maximum gradient of 20°F (11.1°C) per hour
Relative 8% to 80%, maximum wet bulb
Humidity 82°F (29.4°C)

Booting the Disk Unit
After connecting the disk unit to the computer an attempt can be
made to boot the system.
Before booting the system be sure that the computer and disk are
both powered up. Next insert adiskette containing the disk operating
system into drive 0and close the door. The boot can then be executed
to load the operating system. Computers containing aDISKBUG® or
SBUG-E© monitor have an internal disk boot which is executed by enterin
aDcommand. Users without those monitors must enter the boot by han
as listed in the disk operating system software documentation.
Problems
If any problems are encountered in booting the disk unit, the
REGTEST and STEPTEST diagnostics may be used to determine if the disk
controller is operating properly. Power up the computer system and the
disk unit. The disk unit is on when the cooling fan runs. If you do
run into some kind of problem(s) check the following:
1.) Make sure you have at least 20K of RAM memory.
2.) Run the memory diagnostics and verify this memory. to be good.
3.) Makes sure the disk controller board is properly programmed with
the shorting blocks.
4.) Makes sure the DMAF2 disk controller board is plugged onto the
computer system and is properly seated.
5.) Make sure the flat ribbon cable is plugged on the disk
controller board and is oriented correctly.
6.) Makes sure the flat ribbon cable is plugged
onto both disk
drives and is oriented correctly. Check the orientation very
carefully.
7.) Make sure the power connectors are plugged into their mates on
the back of both drives.
8.) Makes sure the miniature connector going to the FD-M motor
control board is oriented properly and plugged onto the
connector pins as specified in the instruction set.
9.) Confirm that the cooling fan on the disk system is running. It
should run whenever the disk system is turned on.
10.) Make sure you have the proper diskette installed in the system.
11.) Run the REGTEST diagnostic (details follow).
12.) Run the STEPTEST diagnostic (details follow).