FROM THE AKRON BBS , 24 hrs. 216-882-4720, HOW TO DO A 320 K DISK DRIVE CONVERSON. 
ORPHANWARE 5665 MYERS ROAD
                         AKRON, OH 44319
                          216-882-4720
 
WARNING--This drive modification should be attempted only by 
experienced computer service technicians.  If you do not have 
extensive experience in computer servicing, have some one 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 with out 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 workman 
ship.  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 re-assembly.  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 you 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.
 

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