Re: A89: Sound Progs

To: <assembly-89@lists.ticalc.org>
Subject: Re: A89: Sound Progs
From: "Miles Raymond" <m_rayman@bigfoot.com>
Date: Fri, 16 Apr 1999 00:48:09 -0500
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Organization: Expert Internet Services
References: <b0d06fc5.244828a1@aol.com>
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While I don't doubt that you are correct, niether my 83 nor my 89 has ever
slowed down when plugged into a powered speaker...  I had always thought
that it meant it was a power problem...

-Miles Raymond      EML: m_rayman@bigfoot.com
ICQ: 13217756       IRC: Killer2        AIM: MRayMan
http://www.bigfoot.com/~m_rayman/


----- Original Message -----
From: <TGaArdvark@aol.com>
To: <assembly-89@lists.ticalc.org>
Sent: Friday, April 16, 1999 12:46 AM
Subject: Re: A89: Sound Progs


> > The 89's link port is powered by the 4AAA batteries, so when you plug in
> > unpowered headphones, this really cut power from the rest of the calc,
> > slowing it down.  If you plug powered speakers into the 89 port, then
you
> > won't notice this slow down as much.
>
> No, though it does probably drain the batteries faster, the
> reason the calc slows down is because it triggers the
> linkport interrupt.  It expects a data transfer and polls the
> port, halting normal functions.  All CBL-compatible
> calculators do this, even ones without silent linking
> capabilities.

References:

Re: A89: Sound Progs

From: TGaArdvark@aol.com