*
********************************
*                              *
*      -< STDIO DEMO >-        *
*                              *
*       VERSION 00.00.01       *
*                              *
*         03/04/1980           *
*                              *
********************************
*                              *
*       NATHAN D. RIGGS        *
*   NATHAN.RIGGS@OUTLOOK.COM   *
*                              *
********************************
*
** ASSEMBLER DIRECTIVES
*
         CYC   AVE
         EXP   ONLY
         DSK   STDIO.DEMO
*
*``````````````````````````````*
*  TOP INCLUDES (PUTS, MACROS) *
*,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,*
*
         PUT   DECS
         USE   STDIO.MAC
*
         PUT   STDIO.HOOKS
         PUT   COMMON.HOOKS
*
         ORG   $6000
*
*``````````````````````````````*
*      PROGRAM MAIN BODY       *
*,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,*
*
*
*
** BIG LUMPS -- HIGH LEVEL CODE
*
*
         JSR   HOME       ; CLEAR SCREEN
*
***
*** USE XPRINT TO PRINT A STRING OF CHARACTERS
*** TO THE SCREEN. THE STRING COMES AFTER
*** THE JSR STATEMENT IN AN ASC/HEX.
***
         JSR   XPRINT
         ASC   "WTF WORLD"
         HEX   8D00       ; THIS TELLS THE
                          ; ROUTINE TO STOP
                          ; PRINTING THE STRING
*
*** USE DPRINT TO PRINT THE TEXT AT A SPECIFIC
*** MEMORY LOCATION. NOTE THAT THIS IS NOT
*** TYPICALLY USED TO PRINT STRINGS, AND LIKE
*** XPRINT USES THE NULL TERMINATOR TO ALERT
*** THE ROUTINE TO STOP PRINTING. TO PRINT
*** STRINGS, WHICH HAVE THE LENGTH OF THE STRING
*** AS THEIR FIRST BYTE VALUE, USE SPRINT.
*
*
         LDA   #$18       ; PUT 'XXX' INTO
         STA   $300       ; LOCATION $300
         STA   $301
         STA   $302
         LDA   #00
         STA   $303
         LDA   #>$300     ; PUSH HIBYTE
         PHA
         LDA   #<$300     ; PUSH LOBYTE
         PHA
         JSR   DPRINT     ; NOW PRINT IT
*
* ^^^ NOTE ABOVE THAT THE HIGH BYTE
* IS PUSHED BEFORE THE LOW BYTE BECAUSE
* 6502 CONVENTION IS TO READ THE LOW BYTE
* FIRST, THEN THE HIGH BYTE. THIS IS THE
* ORDER IT WILL POP OFF THE STACK.
*
***
*** USE THLIN TO CREATE A LINE OF HORIZONTAL
*** TEXT CONSISTING OF A SINGLE CHARACTER.
*** LIKE MANY OTHER SUBROUTINES, THIS USES
*** THE STACK TO PASS VARIABLES.
***
*
         LDA   #0         ; START OF LINE
         PHA
         LDA   #15        ; END OF LINE
         PHA
         LDA   #10        ; Y POSITION
         PHA
         LDA   #$18       ; "X" CHARACTER, INVERSE
         PHA
         JSR   THLIN
*
*** TVLIN WORKS LIKE THLIN, BUT CREATES A VERTICAL
*** LINE INSTEAD OF A HORIZONTAL ONE.
*
         LDA   #0         ; STARTING Y POS OF LINE
         PHA
         LDA   #15        ; END YPOS OF LINE
         PHA
         LDA   #10        ; X POSITION
         PHA
         LDA   #$18       ; "X" CHARACTER, INVERSE
         PHA
         JSR   TVLIN
*
*
*** THE TFILLA ROUTINE ACTS LIKE A COMBINATION OF
*** THLIN AND TVLIN. IT FILLS A GIVEN RECTANGULAR
*** AREA OF THE SCREEN WITH THE DESIGNATED
*** CHARACTER AT X1,Y1:X2,Y2.
*
         LDA   #10        ; LEFT BOUNDARY
         PHA
         LDA   #30        ; RIGHT BOUNDARY
         PHA
         LDA   #5         ; TOP BOUNDARY
         PHA
         LDA   #15        ; BOTTOM BOUNDARY
         PHA
         LDA   #$1A       ; "Z" CHARACTER
         PHA
         JSR   TFILLA
*
*
*** THE SINPUT ROUTINE (SPECIAL INPUT) PROMPTS
*** THE USER FOR A STRING OF TEXT FOLLOWED BY
*** A <RETURN> PRESS, THEN STORES THE INPUTTED
*** STRING AT THE SPECIFIED LOCATION, WITH ITS
*** LENGTH AS THE FIRST BYTE (MAX: 255)
*
         LDA   #>$300     ; PUSH HIGH BYTE FIRST
         PHA
         LDA   #<$300     ; THEN LOW BYTE, SO
                          ; THAT THE ROUTINE
                          ; READS LOW, HIGH
         PHA
         JSR   SINPUT     ; STORES IN $300
*
*
*** THE PADDLE BUTTON ROUTINE CHECKS
*** WHETHER THE DESIGNATED PADDLE BUTTON
*** IS CURRENTLY BEING PRESSED.
*
*
*
*
*
*
********************************
********************************
* NOW LET'S DO IT AGAIN!       *
* (BUT WITH MACROS)            *
********************************
********************************
*
         JSR   HOME
         _PRN  "WTF, WORLD?"
         _CXY  #10;#10
         _TVLN #5;#20;#30;#$18
         _THLN #5;#30;#20;#$1A
         _INP  $300
         _TFIL #0;#39;#0;#21;#$19
*
*
*
** LITTLE LUMPS -- MID/LOW LEVEL
*
*
         JMP   REENTRY
*
*``````````````````````````````*
*        BOTTOM INCLUDES       *
*,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,*
*
*
** BOTTOM INCLUDES
*
         PUT   STDIO.LIB
*
*