[A83] Re: self test counting


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[A83] Re: self test counting




Weird... the GOOD 1.07 dump I found has major problems with displaying the V 
character.  A hacked 1.07 dump had the V character fixed, but it ROM FAILs 
the self test.  I think it's a bug in virtual TI that the V character isn't 
rendered correctly.


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