[A83] Re: self test counting
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[A83] Re: self test counting
I have a 1.O7 too. The 'V' has an extra pixel, but I don't get a ROM FAIL message. So probably you have a bad rom dump. But this can also be of minor importance. Just an example. Every rom page has been filled with $FF at the end. If there's one $FE between those you get a ROM FAIL.
> ----------------------------------------
> From: Dan Weiss <dwedit@hotmail.com>
> Sent: Sat Sep 15 00:25:05 GMT+02:00 2001
> To: <assembly-83@lists.ticalc.org>
> Subject: [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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