Re: A82: Re: Link Port

To: <assembly-82@lists.ticalc.org>
Subject: Re: A82: Re: Link Port
From: "Dines Justesen" <dines@resnet.gatech.edu>
Date: Wed, 27 Jan 1999 01:31:39 -0500
Delivered-To: assembly-82-outgoing@towerguard.unix.edu.sollentuna.se
Delivered-To: assembly-82@lists.ticalc.org
Reply-To: assembly-82@lists.ticalc.org



>
>
>   But if you try to send 82->85 from the TIOS, it won't do it.
>

The bits are send the sameway, but the bytes send using those routines are
different. The TI protokol includes one byte which is used for id. This is
used to identify the unit sending (TI82, PC to TI82, TI85, PC to TI85, TI86,
...). If the calc sees a id it does not understand (a ti82 seeing a ti85 or
PC to ti85) it will cause an error. However since the bytes are send in the
sameway an asm program using the build in routines would be able to
communicate with other calcs.

>   Well, if you set the interrupt speed a little higher wouldn't the the
>processor speed decrease and the interrupt speed balance out?
>

It depends on how the timing is implemented on the calc. I have not looked
at those routines for a long time, but I think the timing is done using
loops (not interrupts), which means that the interrupt speed should be set
the lowest value. If it is interrupt controlled setting the int speed a
little higher is what you need.

Dines