===========================================================================
 BBS: The Abacus * HST/DS * Potterville, MI
Date: 03-24-93 (13:35)             Number: 83
From: EARL MONTGOMERY              Refer#: 233
  To: ALL                           Recvd: NO  
Subj: Interrupts                     Conf: (35) Quick Basi
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Part 3 of 3 parts

LOCATE 3, 1: PRINT "This means AX is composed of two 8 bit ";
PRINT "registers AL & AH";
LOCATE 4, 1: PRINT "Remember we put &H19 in AH and AL returned a";
PRINT " &h2. Therefore AX contains";
LOCATE 5, 1: PRINT "&H1902. And if you do a PRINT &H1902 you get ";
PRINT "6402. I am printing all";
LOCATE 6, 1: PRINT "values in decimal. Anyway, let's print it now."
LOCATE 8, 28: PRINT "Press any key to continue"
loop6:
I$ = INKEY$: IF I$ = "" THEN GOTO loop6
PRINT &H1902
PRINT "Your value may differ depending on your default drive."
LOCATE 23, 28: PRINT "Press any key to continue."
loop7:
I$ = INKEY$: IF I$ = "" THEN GOTO loop7
CLS
LOCATE 1, 1: PRINT "I hear someone saying <My books show AL on ";
PRINT "the left and AH on the right.>";
LOCATE 2, 1: PRINT "Then why doesn't AX contain &h0219 instead ";
PRINT " of &h1902?";
LOCATE 3, 1: PRINT "My reference books show the same thing and ";
PRINT "that is confusing to me too.";
LOCATE 4, 1: PRINT "But trust me for now AH is on the left and AL";
PRINT " is on the right. Maybe someone";
LOCATE 5, 1: PRINT "can shed some light on why the progrmming ";
PRINT "books show examples with AL on the";
LOCATE 6, 1: PRINT "left and AH on the right."
LOCATE 8, 1: PRINT "How would you like to see how the bit wise ";
PRINT "AND operation with";
LOCATE 9, 1: PRINT "&Hff allows us to read the value in AL? Hey!";
PRINT " Where is everyone going!?";
LOCATE 10, 1: PRINT "Class hasn't been dismissed! Hey come back!";
PRINT " Well for those of you who";
LOCATE 11, 1: PRINT "stayed it is very very simple: The AND &Hff";
PRINT " (255) or binary 11111111 "
LOCATE 12, 1: PRINT "sets all the bits in AH to 0. Therefore all ";
PRINT "we have left is what is in AL."
PRINT "Neat huh?"
LOCATE 14, 1: PRINT "Class is now dismissed."
locate 15,1:print"Your instructor was Earl Montgomery"
LOCATE 23, 28: PRINT "Press any key to continue."
loop8:
I$ = INKEY$: IF I$ = "" THEN GOTO loop8
END
rem final part of 3 parts

--- Maximus 2.01wb
 * Origin: Rabbit and Snake's BBS - Richardson, Texas (1:124/6108)
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