[A83] Re: self test counting

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[A83] Re: self test counting


Is this available on the 83+ too?
Sounds cool...

-----Original Message-----
From: Tijl Coosemans <tijl.coosemans@mail.be>
To: assembly-83@lists.ticalc.org <assembly-83@lists.ticalc.org>
Date: vrijdag 14 september 2001 16:38
Subject: [A83] Re: self test counting


>
>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
>>
>> _________________________________________________________________
>> Get your FREE download of MSN Explorer at
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>>
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