{{htmlmetatags>metatag-robots=()
metatag-title=(SCREEN MANIPULATION USING CLS (1) | 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=(SCREEN MANIPULATION USING CLS (1) | ugBASIC User Manual) 
metatag-og:description=(An isomorphic language for retrocomputers)
}}

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

===== SCREEN MANIPULATION USING CLS (1) =====

==== PURPOSE ====
 This example shows how to clear the screen using the ''CLS'' command. First of all, the program will ask for a bitmap screen of 320x200 pixel of resolution with 16 colors, by using the ''BITMAP ENABLE'' command. After this, we set the background color to red using the command ''PAPER'', and we clear the screen with a red color (''RED''). Then we wait for 2 seconds and we re-enable the ''TILEMAP'' mode. So we change the background to yellow (''YELLOW'') and, after setting the empty tile to the one with number 48 (lo "0"), we clear the screen again.   

==== SOURCE CODE ====
   
       IF CAN SCREEN #1 THEN
           SCREEN #1
           PAPER RED
           CLS
           WAIT KEY
       ENDIF
   
       IF CAN SCREEN #2 THEN
           SCREEN #2
           PAPER GREEN
           CLS
           WAIT KEY
       ENDIF
   
       IF CAN SCREEN #3 THEN
           SCREEN #3
           PAPER BLUE
           CLS
           WAIT KEY
       ENDIF
   
       IF CAN SCREEN #4 THEN
           SCREEN #4
           PAPER RED
           CLS
           WAIT KEY
       ENDIF
   
       IF CAN SCREEN #5 THEN
           SCREEN #5
           PAPER GREEN
           CLS
           WAIT KEY
       ENDIF
   
       IF CAN SCREEN #6 THEN
           SCREEN #6
           PAPER BLUE
           CLS
           WAIT KEY
       ENDIF
   
       IF CAN SCREEN #7 THEN
           SCREEN #7
           PAPER RED
           CLS
           WAIT KEY
       ENDIF
   
       IF CAN SCREEN #8 THEN
           SCREEN #8
           PAPER GREEN
           CLS
           WAIT KEY
       ENDIF
   
       IF CAN SCREEN #9 THEN
           SCREEN #9
           PAPER BLUE
           CLS
           WAIT KEY
       ENDIF
   
       IF CAN SCREEN #10 THEN
           SCREEN #10
           PAPER RED
           CLS
           WAIT KEY
       ENDIF
   
       IF CAN SCREEN #11 THEN
           SCREEN #11
           PAPER GREEN
           CLS
           WAIT KEY
       ENDIF
   
       IF CAN SCREEN #12 THEN
           SCREEN #12
           PAPER BLUE
           CLS
           WAIT KEY
       ENDIF
   
       IF CAN SCREEN #13 THEN
           SCREEN #13
           PAPER RED
           CLS
           WAIT KEY
       ENDIF
   
       IF CAN SCREEN #14 THEN
           SCREEN #14
           PAPER GREEN
           CLS
           WAIT KEY
       ENDIF
   
       IF CAN SCREEN #15 THEN
           SCREEN #15
           PAPER BLUE
           CLS
           WAIT KEY
       ENDIF
   
       HALT


==== SOURCE FILE ====
  * ''[[https://github.com/spotlessmind1975/ugbasic/tree/main/examples/screens_cls_03.bas|screens_cls_03.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 screens_cls_03.bas -o example.xex
   altirra example.xex
   
   # Windows 
   ugbc.atari.exe screens_cls_03.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 screens_cls_03.bas -o example.xex
   altirra example.xex
   
   # Windows 
   ugbc.atarixl.exe screens_cls_03.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 screens_cls_03.bas -o example.prg
   x64sc example.prg
   
   # Windows 
   ugbc.c64.exe screens_cls_03.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 screens_cls_03.bas -o example.prg
   yape example.prg
   
   # Windows 
   ugbc.plus4.exe screens_cls_03.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 screens_cls_03.bas -o example.prg
   xplus4 example.prg
   
   # Windows 
   ugbc.plus4.exe screens_cls_03.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 screens_cls_03.bas -o example.bin
   xroar -rompath (your rom path) example.bin
   
   # Windows 
   ugbc.d32.exe screens_cls_03.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 screens_cls_03.bas -o example.bin
   xroar -rompath (your rom path) example.bin
   
   # Windows 
   ugbc.d64.exe screens_cls_03.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 screens_cls_03.bas -o example.k7
   dcmoto
   (choose BASIC 128)
   CLEAR,&H2FFF: LOADM"CASS:",R: EXEC
   
   # Windows 
   ugbc.pc128op.exe screens_cls_03.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 screens_cls_03.bas -o example.k7
   dcmoto
   (choose BASIC 128)
   CLEAR,&H2FFF: LOADM"CASS:",R: EXEC
   
   # Windows 
   ugbc.pc128op.exe screens_cls_03.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 screens_cls_03.bas -o example.prg
   xvic --memory 24k example.prg
   
   # Windows 
   ugbc.vic20.exe screens_cls_03.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 screens_cls_03.bas -o example.tap
   Speccy example.tap
   
   # Windows 
   ugbc.zx.exe screens_cls_03.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 screens_cls_03.bas -o example.rom
   openmsx -cart example.rom
   
   # Windows 
   ugbc.msx1.exe screens_cls_03.bas -o example.rom
   openmsx -cart example.rom
== blueMSX ==
   # Linux 
   ugbc.msx1 screens_cls_03.bas -o example.rom
   bluemsx example.rom
   
   # Windows 
   ugbc.msx1.exe screens_cls_03.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 screens_cls_03.bas -o example.rom
   openmsx -machine \"COL - ColecoVision\" -cart example.rom
   
   # Windows 
   ugbc.coleco.exe screens_cls_03.bas -o example.rom
   bluemsx -machine \"COL - ColecoVision\" example.rom
== blueMSX ==
   # Linux 
   ugbc.coleco screens_cls_03.bas -o example.rom
   bluemsx /machine \"COL - ColecoVision\" /rom1 example.rom
   
   # Windows 
   ugbc.coleco.exe screens_cls_03.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 screens_cls_03.bas -o example.rom
   bluemsx /machine \"SEGA - SC-3000\" /rom1 example.rom
   
   # Windows 
   ugbc.sc3000.exe screens_cls_03.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 screens_cls_03.bas -o example.rom
   bluemsx /machine \"SEGA - SG-1000\" /rom1 example.rom
   
   # Windows 
   ugbc.sg1000.exe screens_cls_03.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 SCREEN MANIPULATION USING CLS (1)|open an issue]] for this example on GitHub. Thank you!===== POWERED BY =====

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