home *** CD-ROM | disk | FTP | other *** search
- Here it is! Your answer to the terribly under-powered stock power supply
- that came with the Amiga 500. This project is currently (no pun intended)
- powering an Amiga 500, 1.5 Meg Memory expansion, 501 1/2 Meg Memory
- expansion, Second Floppy Drive, Digiview, Products ByNery's PC-style hard
- disk controller interface, ST506 Hard Disk controller and 2 full size
- hard disk drives. In addition, as if that wasn't enough, my 1084 monitor
- is pugged into the switched AC socket, allowing everythigh to power up at
- the flip of a single switch!
-
- What's it cost? Between $40 and $70 (greatly depending on your shopping
- ability and whether you purchase a PC clone case, to house external drives),
- time AND A LOT OF CAREFUL CHECKING.
-
- This project is placed in the public domain by:
-
- Thomas Nery
- and
- Products Bynery
- 14 Chambers Court
- Mansfield, Ma. 02048
-
- Make sure you check out ByNeryDemo.zoo. A demonstration/shareware version
- of a Amiga 500 hard disk interface, that allows you to add a PC-style
- hard disk to your amiga 500 (1000's too) for about $150 (with some shopping).
-
- ****************************************************************
- ** DISCLAIMER **
- ** **
- ** NO REPRESENTATIONS OR WARRANTIES ARE MADE WITH RESPECT TO **
- ** THE ACCURACY, RELIABILITY, PERFORMANCE OR OPERATION OF **
- ** THIS DOCUMENTION OR THE RESULTING PRODUCT. **
- ** **
- ** DO TO THE NATURE OF THIS PROJECT, NEITHER THE AUTHOR NOR **
- ** Products ByNery CAN BE HELD LIABLE FOR DAMAGES, REAL OR **
- ** IMPLIED, RESULTING FROM THE CONSTRUCTION, INSTALLATION, **
- ** OR RELIABILITY OF THIS PROJECT. **
- ****************************************************************
-
-
- ****************************************************************
- ** WARNING **
- ** **
- ** THIS PROJECT CONSISTS OF MODIFICATIONS TO A POWER SUPPLY. **
- ** DUE TO THE VOLTAGES AND CURRENTS INVOLVED, APPROPRIATE **
- ** PRECAUTIONS MUST BE TAKEN. **
- ** **
- ** FAILURE TO DO SO MAY RESULT IN BURNS, DEATH OR TOTAL **
- ** FAILURE OF THE AMIGA 500 AND ALL CONNECTED PERIPHERALS. **
- ****************************************************************
-
- ****************************************************************
- ** WARNING **
- ** **
- ** Make sure you acquire this public domain document from a **
- ** reliable source. Unfortunately, there are those among **
- ** us that would like to see your investment go up in smoke. **
- ** **
- ** By running the command: arc v PC-XTpwr.arc PC-XTpwr.pic **
- ** and verifying that the following results are received, **
- ** you can fairly confident in the integrity of the archive. **
- ** **
- ** If you received this file as part of Products ByNery's **
- ** PcIf registration, rest assurred this is untouched. **
- ****************************************************************
-
- Name Length Stowage SF Size now Date Time CRC
- ============ ======== ======== ==== ======== ========= ====== ====
- PC-XTpwr.pic 41700 Squeezed 15% 35666 2 Apr 90 5:51p a21a
- ==== ======== ==== ========
- Total 1 41700 15% 35666
-
-
- The following instructions apply only to PC-XT clone power supplies.
- Although PC-AT supplies will work, the color-coding and connectors described
- pertain only to the PC-XT.
-
- A PC-XT supply has the following safety features:
- * 150 Watt capacity
- * Fused input power protection
- * Over-Voltage protection
- * Over-Current protection
- All of the safety features will protect the Amiga in the event of a failure.
- This actually save my Amiga once when I accidentally shorted 5 Volts to
- Ground during the testing of my PC hard disk interface.
-
- YOU WILL REQUIRE EITHER A VTVM, VOM or DVM to build this project. IF YOU
- DON'T UNDERSTAND THESE ACRONYMS THEN THIS PROJECT IS BEYOND YOU. All
- voltages must be verified prior to installation. ANY ERRORS WILL RESULT
- IN PERMANTENTLY DAMAGING YOUR AMIGA 500! BE CAREFUL!!!
-
- What you will need.
- 1) A VTVM, VOM or DVM
- 2) A PC-XT style power supply
- 3) Your Amiga 500 power supply
- 4) A Soldering Iron, solder and wire stippers
- 5) One male and two female, 6 conductor molex-type connectors
- This item is available at Radio Shack, part numbers:
- Male Connector - Radio Shack part no. 274-226 (1 req'd)
- Female Connector - Radio Shack part no. 274-236 (2 req'd)
- 6) A crimp-on style ring connector
- 7) 6 inches of 18 gauge multistranded hook-up wire.
-
- On the bottom of the Amiga 500 power supply, as well as in the user's
- manual, the following diagram of the Amiga 500's connector appears:
-
- +--\___/--+
- | 3 4 |
- | 5 |
- | 2 1 |
- +---------+
-
- where:
- pin 1: +5VDC
- pin 2: Shield Ground
- pin 3: +12VDC
- pin 4: Signal Ground
- pin 5: -12VDC
-
- With the power supply disconnected from the Amiga, turn the power supply on
- and verify these voltages, BEING CAREFUL NOT TO SHORT OUT ANY PINS! All
- voltage readings should be performed with the voltmeter's ground cable
- connected to the connector's Signal Ground. Record each pin's Voltage.
-
- Once satisfied with the Pin versus Voltage supplied, turn off the power
- supply and unplug it from the wall.
-
- Cut The Amiga 500 side of the power cord leaving approximately 10 inches
- sticking out of the original power supply. Carefully strip back 1 inch of
- cable insulation from each side and then strip each wire, leaving about
- 1/4 inch of the wire showing.
-
- Crimp then solder onto each wire on the power supply side, a female
- connector. Do the same on the side normally attached to the Amiga 500
- except use MALE connectors. Each side should have a total of 5 wires with
- connectors.
-
- Now insert the female connectors into the Molex-style female connector.
-
- Do the same for the male connectors, BUT MAKE SURE THAT THE WIRE COLORS ON
- EACH SIDE OF THE CONNECTOR ARE THE SAME WHEN THE MOLEX-type CONNECTORS
- ARE PLUGGED INTO EACH OTHER.
-
- Once completed, verify that there are no shorts between the various wires.
-
- Plug the two MOLEX-style connectors together, plug in the Amiga 500's power
- supply and re-verify the voltages. They should be the same as previously
- measured.
-
- Once satisfied, your Amiga 500 will operate with the original power supply.
- Nice to have a backup, huh?
-
- Now on to the PC-XT power supply. Referring to the picture, PC-XTpwr.pic,
- 1) Cut the 3, +5VDC power wires on connector J1 and then wire all
- three to a single female connector. Label this +5V.
- 2) Cut the +12VDC power wire on connector J2 and then crimp and
- solder it to a female connector. Label this +12V.
- 3) Cut the -12VDC power wire on connector J2 and then crimp and
- solder it to a female connector. Label this -12V.
- 4) Cut the 4, GND power wires two on J1 and two on J2 and then
- wire all four to a single female connector.
- 5) Connect on end of the multistranded hookup wire to a female
- connector and crimp the ring connector on the other end.
-
- Using the Ohmmeter and the previous diagram, determine which pin in the
- Amiga 500 power cable MOLEX-type connector carries the +5 volts. Connect
- the PC-XT wire labelled +5V to the same slot in the remaining plastic
- connector. Repeat this procedure for +12V, -12V and Ground.
-
- The multistranded hoodup wire should be inserted into the slot where
- connection will be made with the pin labelled SHIELD GROUND. Remove
- one of the screws in the PC-XT power supply, attach the ring connector, and
- the put the screw back.
-
- ****************************************************************
- ** WARNING!!!!! **
- ** **
- ** IT IS IMPERATIVE THAT THE SHIELD CONNECTOR BE SCREWED **
- ** SECURLY TO THE PC-XT POWER SUPPLY. FAILURE TO DO SO MAY **
- ** DAMAGE THE AMIGA 500. **
- ****************************************************************
-
- Plug the Amiga 500 power cable into the PC-XT power supply, BUT DON'T
- ATTACH IT TO THE 500 YET. ALL POWER CONNECTIONS MUST BE VERIFIED!
-
- Plug the PC-XT power supply into a wall outlet, power it on and using the
- voltage meter verify that all of the power connections are the same as
- previously checked.
-
- Once satisfied, turn off the power supply, unplug the power supply from the
- wall, install the power supply in a suitable case and connect to the
- Amiga 500. If you wish, you may plug the monitor into the switched AC
- connector on the power supply.
-
- IF YOU WERE CAREFUL AND VERIFIED ALL CONNECTIONS, TURNING ON THE PC-XT
- power supply should result in the complete powering of your system.
-
- IF YOU FAILED TO CHECK THE VOLTAGES, IT IS LIKELY THAT YOU MADE A MISTAKE
- AND TURNING ON THE POWER SUPPLY AT THIS TIME WILL RESULT IN THE COMPLETE
- LOSS OF YOUR SYSTEM.
-
-