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From: parkern@ (Neil Parker)
Newsgroups: comp.sys.apple2
Subject: Re: Applesoft memory help
Message-ID: <1991May24.082033.27040@lynx.CS.ORST.EDU>
Date: 24 May 91 08:20:33 GMT
References: <26276@know.pws.bull.com>
Sender: @lynx.CS.ORST.EDU
Reply-To: parkern@jacobs.CS.ORST.EDU (Neil Parker)
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In article <26276@know.pws.bull.com> aq696@cleveland.Freenet.Edu (Charles Perlingiero) writes:
>
>I have a couple questions...
>
>First, the locations in ProDOS that contain the minute and the hour will
>not change while a program is running, why?  I wanted to have a clock
>routine in my program, but these locations (49042=minute, 49043=hour) do not
>update when the program is running.  Also, does anyone know if there is
>a second location?  I'm sure ProDOS reads the clock continuously, but how
>can I access it?

ProDOS doesn't read the clock continuously.  It reads the clock whenever it
gets asked to do something for which a time might be necessary.

You can force ProDOS to read the clock and update the time locations by
calling the MLI routine GET_TIME from machine language:

     JSR $BF00     ;Call ProDOS MLI
     DFB $82       ;$82 = GET_TIME
     DW  $0000     ;GET_TIME doesn't use a parameter list
     ...           ;Your code continues here

Thus, to read the clock from BASIC, first POKE the following machine
language routine into memory (put it anywhere you have a few free bytes--it's
relocatable):

     32,0,191,130,0,0,96

Then, whenever you need to read the time, CALL the machine language
routine, and PEEK the time out of the ProDOS global page.

Of course, this won't work if you don't have a clock in your Apple.

>Second, does anyone know if there is direct memory location that will send
>a byte directly to slot 2 (modem)?  And if there is one that will read the
>buffer (like the keyboard scan)?

Well...after you do a PRINT D$;"PR#2", everything you PRINT will go to the
modem, and GET and INPUT will read from the modem (assuming your modem is
in slot 2).

		    - Neil Parker
--
Neil Parker                 No cute ASCII art...no cute quote...no cute
parkern@jacobs.cs.orst.edu  disclaimer...no deposit, no return...
parker@corona.uoregon.edu   (This space intentionally left blank:           )