Re: TI-H: TI Modem

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Re: TI-H: TI Modem



Ok...  hit delete.

J D wrote:

> TI-92?
> ::waves hands::
> Uh, guys?  I have an 86.
> ::silence::
>
> >From: Calan <clambert@geneva.edu>
> >Reply-To: ti-hardware@lists.ticalc.org
> >To: ti-hardware@lists.ticalc.org
> >Subject: Re: TI-H: TI Modem
> >Date: Sun, 23 May 1999 16:55:38 -0400
> >
> >
> > > Grant Stockly wrote:
> > >
> > > >Instead of having to access the link port (at 36 kilobits baud or
> >whatever it
> > > >is) a chip can be hooked up directly to the CPU of the TI92 (through
> >the ROM
> > > >expansion module) and be accessed at about a megabyte a second (I
> >BELIEVE, may
> > > >not be quite that fast.  It also depends on the software used to read
> >the
> > > >data.)
> > >
> > > You can get it to 5k a second through the link port.
> > >
> > > The 68000 at that speed can do ~8MB a second.
> > >
> > > >on a normally clocked TI92.  This would require only the chip that you
> > > >need to access with no serial interface.  It's cheaper (you don't need
> >a
> > > >serial
> > > >interface), simpler (you don't need program in all the serial stuff,
> >you just
> > > >copy a memory location) and a whole lot faster (already discussed).
> > >
> > > Sorry,
> > > You're going to have to do more than just write to a memory location.
> >
> >I have no clue how the network chip works (although I am very interested).
> >But
> >from what I can tell, you just read from the buffer, right?  Can you not
> >map the
> >buffer as memory?
> >
> >Using a 10 MHz chip, that would give a 2.5 MHz bus speed.  The chip has to
> >read in
> >the instruction which will take 1 to 2 bus cycles (not sure, didn't check),
> >then it
> >has to copy the information taking another two bus cycles.  At 16-bit, that
> >is
> >about a megabyte per second, using the most efficient code that I know of
> >(I'm not
> >a programmer):  move.w (a0),(a1) over and over for the size of the buffer.
> >That is
> >not 1MB per second access speed, but 1MB per second copy speed.  Just out
> >of
> >curiosity, where do you get 8MB?
> >
> >That's a lot more than 5k per second either way  (Yes, 36 kilobits is about
> >5
> >kilobytes per second.  4.5 actually.)
> >
> >I understand that every calc has a link port, but the way I see it any of
> >these
> >fine people on TI-hardware who want to network their TI92 would most likely
> >be
> >willing to do a modification or if they own a TI92 use the ROM slot.  Heck,
> >why not
> >just put the chip IN the TI, and then add a network socket on the side or
> >something?  This isn't a commercial product or anything, it doesn't need to
> >be
> >adaptable to every TI in the world, just those who want it.
> >
> >--
> >-Calan
> >
> >Chris Lambert
> >clambert@ieee.org
> >Member of Geneva College Student Branch IEEE
> >Head of Marvin Robotic Development Team
> >URL:  www.geocities.com/SiliconValley/Peaks/6869
> >
> >
> >
>
> _______________________________________________________________
> Get Free Email and Do More On The Web. Visit http://www.msn.com

--
-Calan

Chris Lambert
clambert@ieee.org
Member of Geneva College Student Branch IEEE
Head of Marvin Robotic Development Team
URL:  www.geocities.com/SiliconValley/Peaks/6869
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