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Re: Re: NOVA_TUNE comment. Look before you leap!



Hi,

A minor correction.

Both my Uni_Trac and Nova_Tune designs may use
the "printer port", . HOWEVER  the "printer port" is used purely as a low
level Input\Output device. i.e. It is addressed and manipulated *directly*
at machine code level and never uses or requires the standard "print"
routines or "interrrupts"

You cannor share the *port*  with other equipment
nor use a USB to parallel port adaption..

de

  Dave Lamont    ZL2AMD


----- Original Message -----
From: "John" <g3bvu@arrl.net>
To: <nlsa@nlsa.com>
Cc: <kg8oc@amsat.org>; <r_seiler@junction.net>; <AMSAT-BB@amsat.org>
Sent: Thursday, December 27, 2001 12:02 AM
Subject: [amsat-bb] Re: NOVA_TUNE comment. Look before you leap!


> W9IP de G3BVU  BT
>
> At 15:09 12/26/01 -0500, you wrote:
> >Friends,
> >Tim is correct, Nova_Tune + SASI Sat Tracker would require two free
> >printer ports.  Add-on multi-port cards are about $15, I think.
> >As for USB, it's beastly complicated (therefore expensive) for the tiny
> market
> >that we represent.
> >
> >MRO
> >
> >
> >Tim Pickett wrote:
> >>
> >> The only problem with the new Nova-Tune is you must have TWO printer
ports
> >> to use Nova-Tune, and say SASI-Sat-Tracker, or any other tracker that
> uses a
> >> printer port.
> >> Too bad they didn't make the interface also offer USB to solve that
> problem.
> >>
> >> Tim Pickett, KG8OC
> >> Michigan AMSAT Area Coordinator
> >> kg8oc@amsat.org http://www.qsl.net/kg8oc
> >
> ***********************************************************
> Boxing Day 2001
> Mike,
>
> Another often overlooked problem with NOVA_TUNE, until you confront it,
> can be the limited number of IRQs available in a PC.
>
> Traditionally I have often "stolen" the LPT2 IRQ to provide independent
> IRQs for 3 (or 4) COMM ports. Having a bus (PS-2) mouse helps but if
you're
> stuck with a SERIAL mouse (as on older mother boards) and need the extra,
> independent, IRQs you can be in deep trouble.
>
> NOVA_TUNE can be a blessing for those of us with existing antenna tracking
> systems. But, "Look before you leap".
>
> However Uni-Trac 2000, available from Spectrum International, Concord,
> Mass. USA (see their ad in The AMSAT Journal), provides BOTH antenna
> steering and radio tuning. Uni-Trac 2000 uses NfW (or WISP) as its driver
> in a single "hardware box / software package" and uses only one printer
port.
>
> Seasons Greetings,
> John, G3BVU/W1.
>
>
> ----
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>
>

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