{{htmlmetatags>metatag-robots=()
metatag-title=(MULTI TASKING FOR DUMMIES (7) | ugBASIC User Manual)
metatag-keywords=(ugBASIC,Commodore 64,Commodore PLUS/4,ZX Spectrum)
metatag-description=(An isomorphic language for retrocomputers)
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metatag-og:title=(MULTI TASKING FOR DUMMIES (7) | ugBASIC User Manual) 
metatag-og:description=(An isomorphic language for retrocomputers)
}}

====== ugBASIC User Manual ======

===== MULTI TASKING FOR DUMMIES (7) =====

==== PURPOSE ====
 This example will show how to use multitasking to make a simple animation of various bats and boys on the screen.  

==== SOURCE CODE ====
   
   BITMAP ENABLE (160,200,16)
   ' avoid to insert into the executable
   ' all the code for screen modes #0, #1 and #2
   DEFINE SCREEN MODE UNIQUE
   
   ' do not use double buffering!
   'DEFINE DOUBLE BUFFER OFF
   
   ' We do not use strings: so we ask to define at 
   ' most 10 independent strings with a buffer size
   ' of 128 bytes.
   'DEFINE STRING COUNT 10
   'DEFINE STRING SPACE 128
   
   
   CLS BLACK
   ken := LOAD IMAGES("examples/sf/ken9648.png")  FRAME SIZE (24,48) EXACT 
   blanka := LOAD IMAGES("examples/sf/blanka14448.png" ) FRAME SIZE (40,48) EXACT
   ' ken := LOAD IMAGES("sf/Ken_01b.png")  FRAME SIZE (48,96)
   ' blanka := LOAD IMAGES("sf/Blanka_01b.png" ) FRAME SIZE (72,96)
   
   CONST POSITIVE batCount = 2
   
   DIM x(batCount)
   DIM y(batCount)
   DIM f(batCount)
   
   PARALLEL PROCEDURE moveKen
       SHARED ken, x, y, f
       kenSleeper = 0
       DO
           INC kenSleeper
           IF kenSleeper > 100 THEN
               PUT IMAGE ken FRAME [f] AT [x],[y]
               [f] = [f] + 1
               IF [f] == FRAMES(ken) THEN
                   [f] = 0
               ENDIF
               kenSleeper = 0
           ENDIF
           YIELD
       LOOP
   END PROC
   
   PARALLEL PROCEDURE moveBlanka
       SHARED blanka, x, y, f
       blankaSleeper = 0
       DO
           INC blankaSleeper
           IF blankaSleeper > 50 THEN
               PUT IMAGE blanka FRAME [f] AT [x],[y]
               [f] = [f] + 1
               IF [f] == FRAMES(blanka) THEN
                   [f] = 0
               ENDIF
               blankaSleeper = 0
           ENDIF
           YIELD
       LOOP
   END PROC
   
   x(0) = 0
   y(0) = SCREEN HEIGHT - 48
   f(0) = 0
   SPAWN moveKen
   x(1) = SCREEN WIDTH -40
   y(1) = SCREEN HEIGHT - 50
   f(1) = 1
   SPAWN moveBlanka
   'FOR i=0 TO (batCount-1)
   '    x(i) = i * (SCREEN WIDTH -72)
   '    y(i) = SCREEN HEIGHT - 96
   '    f(i) = i MOD (batCount-1)
   '    IF ( i AND 1 ) == 0 THEN
   '        SPAWN moveKen
   '    ELSE
   '        SPAWN moveBlanka
   '    ENDIF
   'NEXT
   
   DO: RUN PARALLEL: LOOP
   
   
   
   
   
   
   


==== SOURCE FILE ====
  * ''[[https://github.com/spotlessmind1975/ugbasic/tree/main/examples/sf.bas|sf.bas]]''
==== HOW TO COMPILE AND RUN ====
The instructions here refer to compiling the example from the command line. For Microsoft Windows users we suggest using **[[https://spotlessmind1975.itch.io/ugbasic-ide|UGBASIC-IDE]]**, which allows you to compile the example with just one click.=== ATARI 400/800 family ===
In order to compile and run the example, you need to have the Altirra emulator, and in particular that the ''altirra'' executable is accessible.

Then, type this command on the command line:

   # Linux 
   ugbc.atari sf.bas -o example.xex
   altirra example.xex
   
   # Windows 
   ugbc.atari.exe sf.bas -o example.xex
   altirra example.xex
=== ATARI 600XL/800XL/1200XL/XG(SE) family ===
In order to compile and run the example, you need to have the Altirra emulator, and in particular that the ''altirra'' executable is accessible.

Then, type this command on the command line:

   # Linux 
   ugbc.atarixl sf.bas -o example.xex
   altirra example.xex
   
   # Windows 
   ugbc.atarixl.exe sf.bas -o example.xex
   altirra example.xex
=== Commodore 64 ===
In order to compile and run the example, you need to have the VICE emulator, and in particular that the ''x64sc'' executable is accessible.

Then, type this command on the command line:

   # Linux 
   ugbc.c64 sf.bas -o example.prg
   x64sc example.prg
   
   # Windows 
   ugbc.c64.exe sf.bas -o example.prg
   x64sc example.prg
=== Commodore PLUS/4 ===
== Using YAPE ==
In order to run the example, you need to have the YAPE emulator. In particular that the ''yape'' executable is accessible.

Then, type this command on the command line:

   # Linux 
   ugbc.plus4 sf.bas -o example.prg
   yape example.prg
   
   # Windows 
   ugbc.plus4.exe sf.bas -o example.prg
   yape example.prg
== Using VICE ==
In order to run the example, you need to have the VICE emulator. In particular that the ''xplus4'' executable is accessible.

Then, type this command on the command line:

   # Linux 
   ugbc.plus4 sf.bas -o example.prg
   xplus4 example.prg
   
   # Windows 
   ugbc.plus4.exe sf.bas -o example.prg
   xplus4 example.prg
=== Dragon 32 ===
In order to compile and run the example, you need to have the XROAR emulator, and in particular that the ''xroar'' executable is accessible.

Then, type this command on the command line:

   # Linux 
   ugbc.d32 sf.bas -o example.bin
   xroar -rompath (your rom path) example.bin
   
   # Windows 
   ugbc.d32.exe sf.bas -o example.bin
   xroar.exe -rompath (your rom path) example.bin
=== Dragon 64 ===
In order to compile and run the example, you need to have the XROAR emulator, and in particular that the ''xroar'' executable is accessible.

Then, type this command on the command line:

   # Linux 
   ugbc.d64 sf.bas -o example.bin
   xroar -rompath (your rom path) example.bin
   
   # Windows 
   ugbc.d64.exe sf.bas -o example.bin
   xroar.exe -rompath (your rom path) example.bin
=== PC128 Olivetti Prodest ===
In order to compile and run the example, you need to have the DCMOTO emulator, and in particular that the ''dcmoto'' executable is accessible.

Then, type this command on the command line and on the emulator:

   # Linux 
   ugbc.pc128op sf.bas -o example.k7
   dcmoto
   (choose BASIC 128)
   CLEAR,&H2FFF: LOADM"CASS:",R: EXEC
   
   # Windows 
   ugbc.pc128op.exe sf.bas -o example.k7
   dcmoto
   (choose example.k7)
   (choose BASIC 128)
   CLEAR,&H2FFF: LOADM"CASS:",R: EXEC
=== Thomson MO5 ===
In order to compile and run the example, you need to have the DCMOTO emulator, and in particular that the ''dcmoto'' executable is accessible.

Then, type this command on the command line and on the emulator:

   # Linux 
   ugbc.pc128op sf.bas -o example.k7
   dcmoto
   (choose BASIC 128)
   CLEAR,&H2FFF: LOADM"CASS:",R: EXEC
   
   # Windows 
   ugbc.pc128op.exe sf.bas -o example.k7
   dcmoto
   (choose example.k7)
   (choose BASIC 128)
   CLEAR,&H2FFF: LOADM"CASS:",R: EXEC
=== Commodore VIC-20 ===
In order to compile and run the example, you need to have the VICE emulator, and in particular that the ''xvic'' executable is accessible.

Then, type this command on the command line:

   # Linux 
   ugbc.vic20 sf.bas -o example.prg
   xvic --memory 24k example.prg
   
   # Windows 
   ugbc.vic20.exe sf.bas -o example.prg
   xvic --memory 24k example.prg
=== ZX Spectrum ===
In order to compile and run the example, you need to have the Speccy emulator, and in particular that the ''speccy'' executable is accessible.

Then, type this command on the command line:

   # Linux 
   ugbc.zx sf.bas -o example.tap
   Speccy example.tap
   
   # Windows 
   ugbc.zx.exe sf.bas -o example.tap
   Speccy example.tap
=== MSX ===
In order to compile and run the example, you need to have the openMsx or the BlueMSX emulator, and in particular that its executable is accessible.

Then, type this command on the command line:

== openMSX ==
   # Linux 
   ugbc.msx1 sf.bas -o example.rom
   openmsx -cart example.rom
   
   # Windows 
   ugbc.msx1.exe sf.bas -o example.rom
   openmsx -cart example.rom
== blueMSX ==
   # Linux 
   ugbc.msx1 sf.bas -o example.rom
   bluemsx example.rom
   
   # Windows 
   ugbc.msx1.exe sf.bas -o example.rom
   bluemsx example.rom
=== ColecoVision ===
In order to compile and run the example, you need to have the openMsx or the BlueMSX emulator, and in particular that its executable is accessible.

Then, type this command on the command line:

== openMSX ==
   # Linux 
   ugbc.coleco sf.bas -o example.rom
   openmsx -machine \"COL - ColecoVision\" -cart example.rom
   
   # Windows 
   ugbc.coleco.exe sf.bas -o example.rom
   bluemsx -machine \"COL - ColecoVision\" example.rom
== blueMSX ==
   # Linux 
   ugbc.coleco sf.bas -o example.rom
   bluemsx /machine \"COL - ColecoVision\" /rom1 example.rom
   
   # Windows 
   ugbc.coleco.exe sf.bas -o example.rom
   bluemsx  /machine \"COL - ColecoVision\" /rom1 example.rom
=== SEGA SC-3000 ===
In order to compile and run the example, you need to have the BlueMSX emulator, and in particular that its executable is accessible.

Then, type this command on the command line:

   # Linux 
   ugbc.sc3000 sf.bas -o example.rom
   bluemsx /machine \"SEGA - SC-3000\" /rom1 example.rom
   
   # Windows 
   ugbc.sc3000.exe sf.bas -o example.rom
   bluemsx  /machine \"SEGA - SC-3000\" /rom1 example.rom
=== SEGA SG-1000 ===
In order to compile and run the example, you need to have the BlueMSX emulator, and in particular that its executable is accessible.

Then, type this command on the command line:

   # Linux 
   ugbc.sg1000 sf.bas -o example.rom
   bluemsx /machine \"SEGA - SG-1000\" /rom1 example.rom
   
   # Windows 
   ugbc.sg1000.exe sf.bas -o example.rom
   bluemsx  /machine \"SEGA - SG-1000\" /rom1 example.rom
==== ANY PROBLEM? ====
If you have found a problem trying to run this example, if you think there is a bug or, more simply, you would like it to be improved, [[https://github.com/spotlessmind1975/ugbasic/issues/new?title=IMPROVE MULTI TASKING FOR DUMMIES (7)|open an issue]] for this example on GitHub. Thank you!===== POWERED BY =====

[[:ugbasic:user:examples|{{ :ugbasic:user:logo-ugbasic.png?nolink&600 |}}]]