[A83] Re: self test counting

To: assembly-83@lists.ticalc.org
Subject: [A83] Re: self test counting
From: "Dan Weiss" <dwedit@hotmail.com>
Date: Fri, 14 Sep 2001 14:17:35 -0500
Reply-To: assembly-83@lists.ticalc.org

My ROM 1.07 fails under VTI...  Maybe this explains why the V character 
looks bad?



>From: Tijl Coosemans <tijl.coosemans@mail.be>
>Reply-To: assembly-83@lists.ticalc.org
>To: assembly-83@lists.ticalc.org
>Subject: [A83] Re: self test counting
>Date: Fri, 14 Sep 2001 16:36:03 +0200
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>
>Well, since I didn't had much to do, I ran a few tests.
>
>When you press enter at the 'Enter self test' screen, the calculator makes 
>a one-byte checksum of the rom-pages (not 0000h-3FFFh). It adds up all 
>bytes on every page. On my calculator the checksum was 00h, which is 
>probably different on other calculators. If the number doesn't fit, then 
>you get a ROM FAIL message. Whatever key you press then, the calc will 
>reset and show a mem cleared message. (Maybe this is a good way to figure 
>out if you have a bad rom dump or not.)
>
>Next thing what happens is, that the ram area at 88A4h-FFFFh is filled with 
>00h->FAh,00h->FAh,... And then it checks if each byte is still the same. If 
>it isn't you get a RAM FAIL message, press a button, mem cleared. The 
>reason it doesn't have problems with the stack is because that was moved to 
>88A4h. (The ram addresses may be different on other calculators.)
>
>After that it checks for an ON-key press by checking an IY bit. If there 
>wasn't it increases a counter, displays it and does everything all over 
>again. So the counter indicates how many times it has checked both rom and 
>ram.
>
>If you press ON, the calculator runs an LCD test. Each time you press a key 
>you get a different screen in the following order: vertical bars, black 
>screen, white screen, diagonal lines, horizontal bars. Then you get 
>vertical bars again and the contrast is set to maximum. Each time you then 
>press a key the contrast is lowered until it reaches 0. You can also skip 
>this LCD test by pressing ON at whatever screen.
>
>Screen is cleared and the contrast is restored to what it was, before the 
>lcd test.
>
>Next and last test is a keyboard test. You get a number on the screen that 
>indicates the key you have to press. The number is the same as what the 
>Basic command getKey returns. So the first digit indicates the row and the 
>second the column. Each time you press the right key the number changes. 
>This test can also be skipped by pressing ON. You then just quit and get a 
>Mem cleared message.
>
>When all test succeeded the calculator displays "OK", which is rather funny 
>:-)
>
>
> > ----------------------------------------
> > From: The one and only SUCKER ... <sucker_pvn@hotmail.com>
> > Sent: Thu Sep 13 19:37:06 GMT+02:00 2001
> > To: <assembly-83@lists.ticalc.org>
> > Subject: [A83] self test counting
> >
> >
> >
> > Somebody knows where the counter from MODE-ALPHA-S stops?
> > Or maybe describe what is does??
> >
> >      SUCKER
> >
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Follow-Ups:
[A83] Re: self test counting
From: Gavin Olson <gtolson@snet.net>