[Coco] Controller question

[Bruce W. Calkins]

The 3022 required 12 volts.  It is the controller of choice for conversion 
to full 1.44 meg 3.5" disk capability.
The 501 and 502 were both short cases.

Bruce W.

=============================

----- Original Message ----- 
From: "Arthur Flexser"

> Other differences between the FD501 and the FD502 are that the FD501
> takes a 24-pin ROM and the FD502 a 28-pin one;  the FD502 is
> physically shorter;  and the FD502 lacks the pin on the edge connector
> for accessing the upper 8K of the ROM.
>
> Art
>
> On Wed, Aug 29, 2012 at 6:33 PM,  <jdaggett at gate.net> wrote:
>> Bib
>>
>> Thanks for the clarification. Then the original controller 3022 which had 
>> the WD1793
>> predates the FD500. I have the 3022 (large case), FD501 and FD502 (both 
>> small case).
>> Never had the FD500. The real differences that I see between the FD501 
>> and FD502 is the
>> crystal frequency changes from 16 MHz to 8 MHz oscillator. Also the drive 
>> cable connector
>> has inductors inline for EMI reduction.
>>
>> james