Re: TI-H: link port specs

To: ti-hardware@lists.ticalc.org
Subject: Re: TI-H: link port specs
From: Grant Stockly <gussie@stockly.com>
Date: Wed, 13 Oct 1999 18:24:43 -0800
In-Reply-To: <004501bf15e5$f237cae0$0100007f@rdtech.com>
References: <3803A46B.66BE687C@earthlink.net><v04020a01b4299a370ce9@[24.237.5.4]> <v04020a00b42ae7e0ef3d@[24.237.5.4]>
Reply-To: ti-hardware@lists.ticalc.org


>From: Grant Stockly <gussie@stockly.com>
>> >From: Grant Stockly <gussie@stockly.com>
>> >Grant, have you looked at the timing pulse with a 'scope?  When I checked
>it
>> >it on one of my 85's it looked a bit strange, low for half the cycle,
>then
>> >instead of high for the other half, the 'scope trace turns into a solid
>bar
>> >between 0 and Vcc.  Like it was oscillating really fast during the up
>time
>> >or something.
>>
>> Thats fine.  OSC inputs only need to be just above GND.  The pulses don't
>> need to be even, especially on a calculator.
>
>ok, cool, I wasn't sure what the deal on that was.  sure was ugly tho :)
>Can you see any drawbacks to having a crystal clock on the calc?

No disadvantates.  I havn't teste the voltage (I'll do that in a day or
two) but what you see on the osc is most likely a TTL signal (0 - 2.5-6
volts).

References:

TI-H: link port specs

From: Matthew Pirkey <mattymaximus@earthlink.net>

Re: TI-H: link port specs

From: Grant Stockly <gussie@stockly.com>

Re: TI-H: link port specs

From: Grant Stockly <gussie@stockly.com>

Re: TI-H: link port specs

From: "David Knaack" <dknaack@rdtech.com>