HOW TO DO A 320K DISK DRIVE CONVERSON.
 
ORPHANWARE 
5665 MYERS ROAD 
AKRON, OH 44319 
 
WARNING--This drive modification should be attempted only by experienced computer service technicians. If you do not have extensive experience in computer servicing, have someone with the required experience do the work for you. Orphanware will not be responsible for the results of any modification not done by Orphanware.
 
ESD CAUTION--This equipment is static sensitive and can be easily destroyed. If you do not know what you are doing, please take it to someone who can help you. Failure on an electronics project such as this can be traced to ESD damage in 75% of all instances.
 
The 320K or 320 conversion kit is supplied without warranty. This is due to the fact that we at Orphanware have no control over the quality of work that is performed by the customer, nor do we have any way of knowing the condition of the drive prior to modification. We will replace for 30 days, any part supplied with this kit that fails do to defect in materials or workmanship. This includes the SYSTEM EPROM, the FUJITSU drive assembly and the 7405 IC. In order to be able to return any part, it must be in the same condition as when received by you.
 
To accomplish this mod, remove the drive from service. Disassemble the drive by removing the top and 2 bottom covers. Then remove the 2 sheet metal screws that hold the front panel on and lay aside all the plastic parts for later reassembly. Next, remove the MPI drive section from the drive. Do this by disconnecting the 34 conductor ribbon cable from the drive assembly, disconnect the power connector, the green wire behind the ribbon cable and the sensor connector.
 
Lay the drive assembly just removed aside. Now, remove the power connector for the drive controller board. Clip the blue wire at both connector ends. Next clip all 3 remaining wires at the center and splice in the 3 sections of wire provided. Use heat shrink to insulate the solder joints.
 
Remove the the controller board from the frame assembly. Using a vice, crush the 4 indented areas of the frame where the screws to secure the drive mechanics are inserted. This should be crushed until it is flat.
 
Now you will need to determine the part number for U4 on the controller board. If it is a 74LS05, you will need to replace it with the 7405 provided in the kit. Do this carefully as a great deal of damage can be done here.
 
Now, turn the controller board over and solder a piece of the provided 30 gauge wire from pin 34 of P5 to pin 2 of P4 (pin 1 is identified by a white dot). Now connect a section of wire from o73 P5 pin 32 to pin 8 of U3. Next connect a section of 30 gauge wire from U3 pins 9 an 10 to U6 pin 17. The first wire is for the disk present signal and the second 2 for side select.
 
Reinstall the controller board in modified frame assembly. Remove the system EPROM (U10) and replace with the provided system EPROM. Now, install the previously modified power connector.
 
You will need to determine if the mechanics you have is equipped with a disk present switch. If not, you will need to locate an area suitable to mount the provided micro switch and connect the normally closed contact to a DC ground on the drive and the common contact to pin 34 on the drive plug that connects to the ribbon cable. This switch is adjusted so that a ground is applied to pin 34 when a disk is not present, and an open when a disk is in place. It is best so that the switch actuates when you make the last few degrees of rotation of the access handle. We have been using a hot glue gun to install them on the drives that we are doing here at Orphanware. **NOTE** installing this switch may invalidate the warranty on your drive.
 
You are now ready to install the drive mechanics. Place them in the frame and connect the 34 pin ribbon cable and the power connector. (note that the power connector is keyed to go in only 1 way). Install the 4 screws removed earlier through the side tabs and tighten gently. The drive is now ready to test.
 
Connect it as the first (and only) drive to the computer. Power up the system and put in the disc marked EOS/CP/M FORMAT UTILITIES. Pull reset and you should see a color screen announcing that the format utilities are being loaded. When the system turns control to you, install an unformatted disk in the drive and follow the documentation for the format. The drive should format the disk through block 319. You can then load basic and check the new disk for blocks left (you will be surprised at the space).
 
Next, boot CP/M and run the file ABP25.COM from the utilities disk. Use the documentation from the disk to show you how to use it. Next, use the CFM.COM or FORMAT13.COM to format a double sided CP/M disk. When you do a STAT on the new drive with the double sided disk installed, you should get about 304K free space
 
IN CASE OF TROUBLE 
Check all your work very carefully. If you can not find the problem, you can return the drive along with $45.00 + $8.80 shipping to Orphanware for correction. If you have damaged the controller board, or there is evidence that improper procedures were used, we will bill you at the rate of $25.00 per hour for repairs. (Not to exceed $100.00 for labor) + cost of parts. The drive mechanics will be replace free if it is determined that they have a defect in materials or workmanship (these were tested by FUJITSU and by Orphanware prior to you receiving them).
 
ADDED NOTES:
 
1. On almost all drives that you buy, (360 IBM PC XT compatible), you will have to change the address jumper from D1 to D0. Failure to do so will cause the drive to not work.
 
NOTE BY THE CONNECTION:
 
With Orphanware no longer in business please do not send anything to them if there is a problem. If you cannot do the drive conversion or if you do and it doesn't work, leave me E-Mail here and I will suggest possible places for repair.
 
 
very carefully. 
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