RE: TI-H: 68000

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RE: TI-H: 68000

On my web page under "electronics", you will find chip pinouts and directories :-)
http://www.alaska.net/~zumwalt

-----Original Message-----
From:	Christopher Lambert [SMTP:clambert@sparcy.geneva.edu]
Sent:	Sunday, September 28, 1997 7:15 PM
To:	ti-hardware@lists.ticalc.org
Subject:	Re: TI-H: 68000

Does anyone know the pinout of the EEPROMS in the ROM module?  Basically, 
I am trying to add hardware directly to the address and data bus, and I 
need to know pinouts to do this.
I am confused with one thing though.  The RAM chip has something like 20 
or so addressing pins, but it is only 128K.  It only has 8 I/O pins, but 
the processor had a 16 bit bus, right?  How does this work out?

Chris Lambert
clambert@geneva.edu

On Mon, 29 Sep 1997, Mel Tsai wrote:

> >> > Does anyone know the pinout of the processor in the 92?  I REALLY need to
> >> > know.
> >>
> >> If you know *exactly* which of the 68k series the processor is, and what
> >> package it is in, then you should be able to find data sheets, pinouts,
> >> etc from Motorola's web site at www.design-net.com.
> >
> 
> 
> (back from a long weekend... 120 emails, wooh00!)
> 
> Anyways the TI-92's processor is basically a microcontroller with a
> 68k core, specially made by motorola for TI.  I believe it is 100%
> proprietary so you'll never freely find the datasheet/pinout on any
> website.  They just don't give that information out.  The chip (I
> believe) is a 120 pin Quad Flat Pack chip (been a while since I"ve
> opened the 92 up) and yes it's totally different than any standard
> motorola part.
> 
> There are ways to determine some of the pinouts (like tracing the pins
> back to the memory chips, but even this is flawed because they hacked
> around with address and data line numbers!) but otherwise we won't
> know most of the pins.
> 
> -Mel
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> -The TI-Memory Expansion Homepage
> -http://www.egr.msu.edu/~tsaimelv/expander.htm
>
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