SWTPC DMF2 User manual

IMPORTANT
NOTE
Although every effort has been made to mh
as possible, Southwest Techni
tion reserves the right to rev’
le

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).

REGTEST
The REGTEST diagnostic can be used to verify that the various
registers on aDMAF2 disk controller board are being accessed properly.
REGTEST assumes that the disk drives are connected to the controller and
power is applied as described in the checkout instructions.
To use the REGTEST diagnostic, the code must be entered into the
computer instruction by instruction using the memory examine and change
function of the computer's monitor. Program execution should then be
started at hex location 0100 by either setting the program counter to
0100 and typing Gor by typing J0100 depending on your monitor.
REGTEST will then check each register and will alternately select drive
0and then drive 1. Correct drive selection is indicated if the LED on
the front of drive 0 lights briefly and if the LED on drive 1lights
briefly when the one on drive 0goes out. Both LEDs should never be on
at the same time. Both drive motors should be running. If any register
errors are detected an Xwill be displayed. If no errors are detected a
+will be displayed. The diagnostic should be allowed to run until
256+'s have been displayed.
REGTEST
may be exited by depressing the RESET switch on the
computer. Adiskette need not be installed in the drive.
STEPTEST
The STEPTEST diagnostic can be used to verify that the track
selection circuitry of the system drive and the controller are working
properly. If desired, ablank diskette may be used in place of the
supplied system diskette.
To use the STEPTEST diagnostic, it should first be entered into the
computer instruction by instruction using the memory examine and change
function of the computer's monitor. Adiskette (perferably blank or at
least write protected) should then be installed in drive 0and the door
closed. Program execution should then be started at hex location 0100
by setting the program counter to 0100 and typing Gor by typing J0100
depending on the computer's monitor. STEPTEST will then select drive #0
and check to see if the index hole sensing and motor control circuitry
is working properly. If so, the disk drive heads will be moved back and
forth between track 00 and track 76. STEPTEST outputs no information to
the user--if the heads move back and forth across the diskette, proper
operation is assumed.

STEPTEST -6809 Version
*
*HEAD STEPPING PROGRAM
*
F020 COMREG EQU $F020 _1791 COMMANDREGISTER
0100 ORG $0100
0100 8E FO 20 START LDX #COMREG LOAD THE COMMANDADDRESS
0103 C6 FE LDB #$FE SELECT DRIVE #0
0105 £7 04 STB 4,X STORE IN DRVREG
0107 £6 84 LDB 0,X MOTORS ON, WAIT UNTIL READY
0109 C5 80 BITB #$80
010B 26 F3 BNE START
010D C6 08 LOOP LDB #$08 RESTORE THE HEADS
O10F 8D OC BSR EXEC EXECUTE THE COMMAND
0111 C6 4C LDB #76 TRACK 76
0113 £7 03 STB 3,X .STORE IN DATA REGISTER
0115 8D 11 BSR DEL28 WAIT FOR 1791
0117 C6 18 LDB #$18 SEEK COMMAND
0119 8D 02 ~BSR EXEC _EXECUTE THE COMMAND
011B 20 FO BRA LOOP RE-DO THE STEPPING
011D £7 84 EXEC STB 0,X EXECUTE THE COMMAND
O11F 8D 07 BSR ‘DEL28 WAIT FOR 1791
0121 £6 84 WAIT LDB 0,X .
LOOP UNTIL NOT BUSY
0123 C5 O1 BITB #1
0125 26 FA BNE WAIT
0127 39 RTS
0128 8D 00 DEL28 BSR DEL14
012A 8D 00. DEL14 -BSR DEL
012C 39 DEL RTS
0100 END START
-10 -

F000
F80A
F024
0100
0100
0103
0106
0108
010A
010C
O10E
0111
0114
0117
0119
0118
011D
011F
0121
0123
0125
0127
012A
012C
012F
0131
0134
0136
0139
0138
013E
0140
0142
0145
0147
0149
014C_
O14E
0152
0154
0157
0159
015B
O15F
0160 |
0163
0165
0168
016A
016B
0100
FF
iF
00
F9
00
21
23
21
22
23
6B
24
24
24
F8
6B
F8
FF
00
OA
OA.
OK
*
*
ADDREG
OUTCH
DRVREG
-
START
TEST
DELAY
DEC
BYTE
REGTEST -6809 Version
*~~DMAF2 REGISTER TESTING PROGRAM
EQU $F000
EQU $F80A
EQU $F024
ORG $0100
LDX #ADDREG
LDB BYTE
STB 0,X
STB 1,X
STB 2X
STB 3,X
STB $21,X
STB «$22, X
STB $23 ,X
LDB 0,X
BSR TEST
LDB 1,X
BSR TEST
LDB 2,X
BSR TEST
LDB 3,X
BSR TEST
LDB $21,X
BSR TEST
LDB $22,X
BSR TEST
LDB $23,X
BSR TEST
INC BYTE
LDB #$FE
STB DRVREG
BSR DELAY
LDB #$FD
STB DRVREG
BSR DELAY
LOB O#$FF
STB DRVREG
LDA. #"4"
JSR [OUTCH]
BRA _START
CMPB._—s-BYTE
BEQ OK
LDA. "Xx"
JSR [OUTCH]
RTS bog
LDX #$F FFF
LEAX -1,X
CPX #0
BNE DEC
RTS
FCB 0
END START
START OF DMAC REGISTERS
-CHARACTER OUTPUT ROUTINE
DRIVE SELECT LATCH
LOADADDRESS OF REGISTERS
STORE IN REGISTERS
START READING DATA
INCREMENT THEPATTERN
SELECT DRIVE 0
WAIT AWHILE
SELECT DRIVE 1
DESELECT ALL DRIVES
“PRINT
A+.
~
RE-DO THE TEST
COMPARE THE DATA
OUTPUT A X IF ERRORS
TEMPORARY STORAGE LOCATION

Technical Information
;The following sections contain alimited amount of technical
information on the DMAF2. This information is not supplied to serve as
arepair manual. Service should only be performed by qualified
personnel. Some information may be useful in configuring the DMAF2 for
your particular system.
Howit Works
The DMAF2 disk unit can be broken down into four major parts: disk
controller board, motor control board, power supply and the disk drives.
Disk Controller Board
The purpose of the disk controller board is to interface the disk
drives to the computer system. The DMAF2 Controller Board is very
complex and field service should not be attempted.
The motor control board turns AC power to the disk drives motors on
and off as determined by the timer on the controller board. Integrated
circuit IC1 on the board is an optically coupled triac which in turn
drives Ql, alarger triac. The optical coupling is required to isolate
the disk system's ground from the AC power line. NOTE: The motor
control signal from the disk controller board is fed to two unused pins
on both of the disk drives thru the flat ribbon cable. The miniature
three-pin connector on the motor control board must be plugged onto
these unused pins on one of the two drives otherwise the drive motors
will not turn on. The orientation of the connector is important. Check
the instruction set for complete details. Some of the components —on
this motor contro? board are connected to one side of the AC power line
whenever the disk system's line cord is plugged into an AC receptacle
regardless of whether or not it is turned on or running. Therefore,
exercise extreme caution and never put your hands or tools near the
board whilethe disk system is plugged into an AC receptacle.
P-20 DFPower Supply .
The power supply on the disk system is just about as simple as you
can make it. The secondaries of the transformer are wired to provide 7
VAC and 32 VAC outputs. These in turn are rectified by separate full
wave bridge rectifier circuits providing +9 VDC and +30 VDC: outputs.
These outputs are then run thru separate integrated regulators Q3 and 04
to yield the +5 VDC and +24 vDC outputs required by the disk drives.
Power for the disk controller board is supplied by the computer system.
-12-

DMAF2 Controller Board Jumpers
~The DMAF2 contains anumber of jumper programmable options as
described below.
HALT/BUS REQ
When in the HALT mode, DMA transfers will take place by halting
the processor. When in the BUS. REQ
position, transfers will be
made by utilizing the bus request feature of the 6809. This
jumper should normally be in the HALT position.
PRE COMP/NORM.
When in the PRE COMP position the DMAF2 controller boardwill
automatically pre-compensate (shift) certain bits written to
disk by 250 nS on inner tracks while in the double density mode.
Most disk drives require write pre-compensation and this jumper
should be left in the PRE COMP position.
BA/BA &BS”
When. in the BA position the controller will respond to the
processor's DMA acknowledge by looking at only the BA (bus
available) line. For 6809 systems with the DMAF2 jumper in the
BA-& BS position, the controller will respond only when BA and
BS are high. Normally ajumper on the 6809 processor board
automatically puts the BA &BS status on the BA line so the
DMAF2jumper should be left in the BA position.
1MHz/2MHz. .
This jumper selects the MEMORY READY line timing in 6809
systems. The jumper should be in the 1MHz position for 1MHz
computer
systems and in the 2 MHz position for systems operating
a:Ze
.
’.
MR/NORMWhen in the MR position the system's slow memory line will be
pulled low each time an access is made to the DMAF2 board. This
jumper should be in the MR position for all 6809 systems running
at 2MHz.or when using certain dynamic memory boards.
32K/56K a
:
This. jumper changes the decoding so that the DMAF2:
will respond
to different addresses. It should be in the 32K .position for
6800 operation and the 56K position for 6809 systems.
_UPPER/LOWER
This jumper selects which 512 byte block that the DMAF2 will
respond to of the 1K block selected by the 0-7° jumper. This
jumper should normally be in the LOWER position.
-13 -

0-7
This set of jumpers is used to change the DMAF2's addressing i
1K byte segments. The jumper should normally be left in the
position.
IRQ/NORM
When in the NORM position no interrupts generated by the DMAF2
will be passed to the computer system. This jumper when in the
IRQ position will enable interrupts. The jumper should normally
be in the NORM position.
n
4
32K/56K UPPER/LOWER
0-7 PHYSICAL DMAF2
—— ~~ ADDRESS
RANGE
32 L0~~ 8000-81FF
32 U08200-83FF
32 L18400-85FF
32 U18600-87FF
32 L28800-89FF
32 U28A00-8BFF
32 L38C00-8DFF
32 U38E00-8FFF
32, L49000-9 1FF
32. U49200-93FF
32 L5 9400-95FF
32 U59600-97FF
32 L69800-99FF
32 U69A00-9BFF
32 L7 9C00-9DFF
32 U79E00-9FFF
56 L0 EQ00-E1FF
56 U0E200-E3FF
56 L1 E400-E5FF
56 U1E600-E7FF
56 L2E800-E9FF
56 U2EAQO-EBFF
56 L3ECOO-EDFF
56 U3EEOO-EFFF
56 L4FOO0-F1FF
56 U4F200-F3FF
56. L5F400-F5FF
56 U5F600-F7FF
56 L6F800-F OFF
56 U6FAOO-FBFF
56 L7FCOO-FDFF
56 U- 7FEOO-FFFF
DESEL/SEL
With this jumper in the SEL position, additonal addresses on
lines A16 -Al9 will be output on the bus during DMA transfers.
This jumper should be in the SEL position only in 6809 systems
utilizing memory boards that use the Al6 -A19 address lines
such as the S/09 system.
-14 -

TO +S
FD-M Motor Control Board
ND SE
DRIVE @
MOTOR
SOem
Fawr e( mend
pt N.C.O—
f°
{c1 g.
6
MOTOR CONTROL
DRIVER ON
CONTROLLER
BOARD
VWA——4 I
N.C. ap~&1 rR3
Qt
,
c2
|Tos
WHITE
ee
To Walt
Receptacle
BLACK
Parts List FD-M Motor Control Board
Semiconductors
—Qi
—— ICI
Resistors
—RI 180 0hm %
watt resistor
——~ R2 2200hm ""”
—- R3 4.7 Kohm %watt resistor
Capacitors
—Ci 0.01 mfd @400 Vcapacitor
——~ C2 0.1 mfd @400 Vcapacitor
TIC206D or TIC216D 400 V. triac
MOC3011 optically coupled driver
Note: All voltage specifications are minimums.
-15 -

|
1
Il
|Tdi
i
P-30 DF Power Supply
*
.
:
ni sboll
cr .
ry rs if co Ps
Fee “3
4d
Peis oe oe G;«ty
PartsList P-30 DF Power Supply
ro
el
Resistors Diodes
R1 243 ohm 1% resistor D1* —1N5402 high current diode
R2 4320 ohm 1% resistor D2* """a”
R3 not used D3* "" ” "
_R4 not used D4* ""res
D5* notused
Capacitors D6* |1N4003 diode
Ci 0.1 mfd capacitor D7*. ©1N5402 high current diode -
C2 0.1 mfd capacitor D8* ”"”"
C3* 10,000 mfd @ 40 VDC DgO* ""no"
D1 o* nt
‘
mn
.mo oe
D11* 1N4003 diode
D12* 1N4003 diede
D13* 1N4003 diode
D14* not used
electrolytic capacitor _
C4* 29,000 mfd @ 15 VDC
electrolytic capacitor
C5* 1,000 mfd.@25 VDC |
electrolytic capacitor
C6 not used |MELEE
TARE
Pky we Regulators .
Q1* ~LM323+5 VBC regulator. -Q3* notused
Q2* £~LM317
adjustable regulator .——- O4* notused.
Miscellaneous
T1* Power transformer 50-60 Hz —— F1 ‘2% amp slo-blo fuse
Primary: 120/240 VAC —— J24 Jumper Installed
Secondaries: 12 VAC @ 1.5 amp
12 VAC @1.5 amp
7VAC@3 amp
24 VAC @200 ma
All components flagged with a(*) must be oriented as shown
in the component layout drawing and pictorials.

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