[Coco] 6551 at 115200 bps

[Mike Pepe]

If it only has 2 terminals, it's gotta be a crystal. The typical metal
can oscillators you're going to see, like this:

1- buy one of these:

http://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?langId=-1
&storeId=10001&catalogId=10001&productId=27879&

2- remove the 1.8432MHz crystal from the RS232 pack

3- Piggyback the oscillator power and ground on top of some other 14 pin
TTL in the pack

4- fly a wire jumper from the oscillator output to TxC,RxC, and XTAL1 on
the 6551

5- see what happens.

I'm probably going to try this, just because I want to see what happens.

As to why setting the divider to 0000 seems to have the same effect- I
don't know. According to the datasheet it shouldn't.

Also yes, I'm aware that there are a lot of people using terms
interchangeably- much to the confusion of others!


> -----Original Message-----
> From: coco-bounces at maltedmedia.com [mailto:coco-
> bounces at maltedmedia.com] On Behalf Of Roger Taylor
> Sent: Sunday, January 18, 2009 7:47 PM
> To: CoCoList for Color Computer Enthusiasts
> Subject: Re: [Coco] 6551 at 115200 bps
> 
> At 09:31 PM 1/18/2009, you wrote:
> >Roger- a crystal is a passive device that needs a circuit in order to
> >generate a signal. An oscillator (in the Jameco sense) is a device
> that
> >contains said circuit and crystal in one package.
> 
> Some people are calling a crystal an oscillator even when they know
> the difference.  Google up some 6551 hack topics and try to follow
> their garbage.
> 
> Jameco shows a 2-lead "oscillator" that looks just like the crystal
> package.  Using only 2 connections, one going to RxC, the other would
> need to go to 5V, ground?
> 
> --
> Roger Taylor
> 
> http://www.wordofthedayonline.com
> 
> 
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