[Coco] CoCoNet status

[Darren A]

On 2/10/09, Roger Taylor  wrote:
> At 11:06 AM 2/10/2009, you wrote:
>>I have been following the CoCoNet discussions and reviewing coco3.com, at
>>this point I am still a little confused as to whether or not CoCoNet will
>>work on a CoCo 1, and if the serial ROM paks you are considering will also
>>work on a CoCo 1.
>
>
> The bitbanger version of CoCoNet currently runs at one speed, a base
> speed of 57600 bps (115200 bps in ~2mhz mode), and won't work on a
> CoCo 1 due to (I think) a signal switching speed issue.  I'll have to
> put in a 38400 bps mode or leave the option to just get the wireless pak.
>
> The wireless pak will work on a CoCo 1.
>

--

The CoCo 1 uses a 741C opamp in the Data Out circuit of the bit banger
(for RS-232 level translation).  That opamp has a slew rate which is
too slow to handle transitions at 57600 bps. If  a compatible part
exists which operates at a higher speed then you could probably
retrofit a CoCo 1 to solve this problem.

Darren