Re: A89: HW1, HW2, and HW3?

To: assembly-89@lists.ticalc.org
Subject: Re: A89: HW1, HW2, and HW3?
From: Olle Hedman <oh@hem.passagen.se>
Date: Tue, 14 Dec 1999 03:57:33 +0100
References: <38547D6F.8F81CFF0@calc.org> <3854842F.925E5582@hem.passagen.se> <3855A380.BCFB3362@oregontrail.net>
Reply-To: assembly-89@lists.ticalc.org

I was mostly guessing :)
I think more of the reserved bytes theory.
btw, the pdf describing the flashrom found in at least the HW1 calcs
(probably the same in HW2) is to be found at my page
http://alh.dhs.org/ti89/
I have only read through it breafly, so I don't know how it handles bad bytes,
but yes, flashroms mostly work as you described.
The chip is a LH28F160S3(T-L10) and is made by Sharp.
(the japs infiltrate a lot, don't they ;)

//Olle

Cassady Roop wrote:
> 
> FlashROM normally leaves 'extra' bytes before and after each block I
> think, in case a few bytes fail.  Next time the Flash controller tests
> (each write?  each reset?) it might check for bad ones, and remap to the
> extras.  At least that's how some Flash chips work, I don't know what
> TI's are like.
>

References:

A89: HW1, HW2, and HW3?

From: Scott Dial <wrath@calc.org>

Re: A89: HW1, HW2, and HW3?

From: Olle Hedman <oh@hem.passagen.se>

Re: A89: HW1, HW2, and HW3?

From: Cassady Roop <croop@oregontrail.net>