[A83] Re: data sent to the black hole, and Iondetect for apps

To: assembly-83@lists.ticalc.org
Subject: [A83] Re: data sent to the black hole, and Iondetect for apps
From: Charlie Adams <charlieadams@bellsouth.net>
Date: Tue, 03 Jun 2003 18:47:31 -0500
In-Reply-To: <Law15-F814LgwrVV72X0001bef3@hotmail.com>
References: <Law15-F814LgwrVV72X0001bef3@hotmail.com>
Reply-To: assembly-83@lists.ticalc.org
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.3b; MultiZilla v1.4.0.3e) Gecko/20030521 Thunderbird/0.1a

there's a program for mirageos that can recover programs from ROM after 
a crash (as long as they weren't lost in a garabage collect).  i think 
dan englender made it... i can't remember, haven't touched a calc in too 
long.
Dan Weiss wrote:

> I just discovered that when you delete a program on the TI83, the data 
> isn't erased at all.  Only its entry in the VAT gets destroyed 
> immediatly.  As more memory is allocated, the old program data gets 
> overwritten.
>
> So I'm testing Bubble Bobble out with external levels, and go then 
> delete the level.  When I went to resume the game using the old 
> pointer to the levels, level 1 got junked up bad, but the rest of the 
> levels were still perfectly intact!  And this is AFTER deleting the 
> map file.
>
> Maybe it would be possible to write a program recoverer, or (actually 
> useful) maybe a scandisk type program something to correct bad VAT 
> enteries, like ones that point to ROM and freeze the calc when you 
> delete them.
>
>
> A question: How do I modify ionDetect on the TI83+ to run from an 
> app?  I don't think you can use the unmodified ionDetect from an app 
> since it copies the detected program to the address pointed by ($9820) 
> [tempmem].
>
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References:

[A83] data sent to the black hole, and Iondetect for apps

From: "Dan Weiss" <dwedit@hotmail.com>