Re: Apple Disk Drive - Hardware Mod Question

["Mark Cummings" <NOTfigjams@primus.com.au>]

To elaborate on what Wayne has said, this is my attempt at a diagram to help
explain it...

You need a SPDT "Centre Off" (mini) toggle switch. It looks a bit like this
(the centre pin is common)...

    ----
O==|    |
O==|    |]=====O
O==|    |
    ----

Wire it in like this...

        existing internal drive Write Protect Switch
                                 |
                                 V     O open
    existing wire(~)       common
~~~~~~~~~~~~~+~~~~~~X~~~~~~+~~~~~O----->O~~~~~+~~~~~~~~~
             |     cut     |        closed    |
             |             |                  |
             |             |                  |
             |             |                  |
             |             |                  | new wire (-)
             |             O normal           |
             |                                |
             ----------O---->  protect        |
                common                        |
                           O-------------------
                              enable

Of course this would be for the old Disk ][ drive, the newer Apple 5.25
drives use opto-couplers, so I'm not sure how that would be wired up.
Probably in a similar fashion.

How does this look to you Wayne ???

Mark


Thelbane wrote in message
<0odQ6.38333$y_3.12405242@typhoon.austin.rr.com>...
>I don't know if I'm electronically savvy enough to pull off the
installation
>of a three-position switch, but I should be able to rig something up
that'll
>work.  I guess I just need to take a good look inside the case... it'll
>probably easier than I thought.
>
>Thanks for the info.
>
>-Thel
>
>"Wayne Stewart" <waynes@intergate.bc.ca> wrote in message
>3B1154F7.85F726D5@intergate.bc.ca">news:3B1154F7.85F726D5@intergate.bc.ca...
>>
>>
>> Thelbane wrote:
>>
>> > Has anyone modified an internal or external Apple II drive so that it
>can
>> > write to write-protected disks?  If anyone has done this or knows how
to
>do
>> > it, I'd appreciate your help before taking a crack at it myself.
>> >
>> > "Why the hell would you want to do that?  Just use a hole-puncher on
the
>> > disk!" you say...
>>
>> Just bypass the write protect switch. In a Disk II, switch open is write
>> protected
>> and of course closed is write-enabled. If you wired in a 3 position
toggle
>> switch
>> you could easily set up write protected, write enabled & normal
>>
>> Wayne
>>
>
>