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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.
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
Southwest Technical Products Corporation Document
SWTPC Minifloppy Disk Unit
Introduction
Jumper Programming the DC-4 Controller Board
Oct 23, 2000
1
holleymj@aol.com
Circa 1978
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Summary of Contents for SWTPC DC-4
- Page 1 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.
- Page 2 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.
- Page 3 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.
- Page 4 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.
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Page 5: In Case Of Problems
Do not write on the plastic jacket with a lead pencil or ball point pen. Use a felt tip pen. Heat and contamination from a carelessly dropped ash can damage the disk. Do not expose ....diskettes to excessive heat or sunlight. Do not touch or attempt to clean the disk surface. - Page 6 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.
- Page 7 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.
- Page 8 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.
- Page 9 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.
- Page 10 Parts List -- DC-4 Minifloppy Disk Controller Resistors ____ 10K ohm 1/4 watt resistor ____ 150K ohm 1/4 watt resistor ____ 56K ohm " ____ 4.7M ohm " " ____ 75K ohm " ____ 33 ohm " ____ 150 ohm "...
- Page 11 This adjustment has been performed at the factory on assembled units. Connect the oscilloscope to test point 1 (TP 1) on the DC-4 board. The ground lead of the scope should be connected to the ground screw on the regulator or other ground on the DC-4 board, not on the ground pin of the connector bus.
- Page 12 Parts List P-30 MF Rower Supply Resistors Diodes ____ 243 ohm 1% resistor ____ 1N5402 high current diode ____ 2030 ohm 1% resistor ____ 1N5402 high current diode ____ 243 ohm 1% resistor ____ 1N5402 high current diode ____ 2030 ohm 1% resistor ____ 1N5402 high current diode ____...
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