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 Post subject: [142.1] help me
PostPosted: Sun Dec 30, 2001 11:58 pm 
hi my name is murat.from turkey.
i educate at marmara university and i need help about programming 6502. i have to deliver my project given by an assistant at university.
subject:make a walking writing program by using 16 characters.
IF U HELP ME OR NOT, I LL BE HAPPY ...
e-mail:pitchmeup@yahoo.com..


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 Post subject: [142.2] help me
PostPosted: Wed Jan 02, 2002 10:47 pm 
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Joined: Fri Aug 30, 2002 9:02 pm
Posts: 1681
Location: Sacramento, CA
HI

Help me to understand your project a little more:

By "walking writing" do you mean a display of 16 characters which has a message scolling across it?

Also, what kind of input/output devices will you use (or at what are the parameters for these devices)

As an overview, if my asumption is correct, you will have to store the text to a memory location with a null terminator (unless the message will always be exactly 16 characters.

Next, use the x (or y) register to index the text. By adjusting the starting value of x, you can start your message with a different letter. You will of course have to account for the scrolling speed and direction as well.

Give me more details and I'd be glad to HELP. I won't write your code but I can help give you some direction.

Daryl

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 Post subject: [142.3] help me
PostPosted: Thu Jan 03, 2002 2:07 am 
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Joined: Fri Aug 30, 2002 1:09 am
Posts: 8428
Location: Southern California
Quote:
you will have to store the text to a memory location with a null terminator (unless the message will always be exactly 16 characters.

Another commonly used option is to start the string with a byte (or pair of bytes) telling the length. With the common intelligent character LCD modules, character $00 can be one of up to eight user-defined characters where you actually tell the LCD module which dots to turn on for that character.

For newcomers: The "help me" plea comes across this forum regularly. As Daryl says, we really need the person requesting the help to be more specific. I replied to Murat privately, but have not heard from him again. Being at a school in Turkey, perhaps he does not have daily access to E-mail. [Edit, 12/22/21: I added some tips on how to get forum help, in the second half of the 6502 primer's page about general steps for a successful project, at http://wilsonminesco.com/6502primer/steps.html, after the heading "Getting help on the 6502.org forum:"]

Garth

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