[Coco] CoCo Cassette Relay (Remote)

[Chad H]

DriveWire is completely useless for many ROM's and BIN files as the HDB-DOS
that supports DriveWire also screws up those programs.

 

For example..  ZAXXON will NOT run while HDB-DOS (DriveWire) is running.   I
just CLOADM it from tape.    There are others.

 

From: Tony Cappellini [mailto:cappy2112 at gmail.com] 
Sent: Sunday, October 20, 2013 12:46 PM
To: Chad H
Subject: Re: CoCo Cassette Relay (Remote)

 

Ok- but why would you want to use the cassette port when you have drivewire?

 

On Sun, Oct 20, 2013 at 10:35 AM, Chad H <chadbh74 at hotmail.com> wrote:

I use the cassette port as much as drivewire, perhaps more.  Physical
floppies are still my primary medium.   Jameco has 5VDC eletro-mechanical
relays for cheap.
http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_174450_-
1  for example.  

 

I still actually use a CCR-81 tape deck.  It is if perfect working order.  I
also have a spare in storage that is New-in-box, only removed for inspection
and testing.  The factory power cable/data cable are still sealed in
plastic.

 

From: Tony Cappellini [mailto:cappy2112 at gmail.com] 
Sent: Sunday, October 20, 2013 12:29 PM
To: Chad H


Subject: Re: CoCo Cassette Relay (Remote)

 

Aromat makes a huge selection of relays.

Finding one withe the same current/voltage ratings for the coli & contacts
should b very easy.

 

Trying to find one with the same physical dimensions and pin configuration
will be harder, but is also of less concern.

In a pinch, you could just mount another relay anywhere, and just run small
wires to the pads.

 

Of course- how often do you really use the cassette port, given that you can
use floppies, hard drives, and eliminate the need for a cassette

 by using drivewire?

 

 

 

On Sun, Oct 20, 2013 at 10:22 AM, Chad H <chadbh74 at hotmail.com> wrote:

That is correct, the relay is definitely Double Throw, but only Single Pole.


 

The underside of the relay is 5 pins  (rough diagram is this)..

 

            1           2     3

            4                 5

 

Pins 4 & 5 are the Coil points  (Supply 5 volts DC across these and it

latches)

 

Pins 1 & 3 are Normally closed  (not used)

 

Pins 1 & 2 are Normally open  (Open circuit leaves cassette motor off) These
are bridged when the 5V latches the relay and causes the motor to run.

This can also be shown by bridging the first and list pin of a cassette
cable while its unplugged from the back of the CoCo, same thing.

 

From: Tony Cappellini [mailto:cappy2112 at gmail.com] 
Sent: Sunday, October 20, 2013 10:56 AM
To: CoCoList for Color Computer Enthusiasts
Cc: chadbh74 at hotmail.com
Subject: Re: CoCo Cassette Relay (Remote)

 


>>That relay is IIRC a dpdt, but could be a spdt.  If dpdt, clean the other


I have to disagree with this.

There aren't enough leads on the relay in the picture that was posted, to be
a dpdt.

 

A dpdt relay would require 6 leads for the switch contacts,and two for the
coil.

 

There are only 5 leads visible, so that would indicate SPDT