Table of Contents

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 320×200 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

HOW TO COMPILE AND RUN

The instructions here refer to compiling the example from the command line. For Microsoft Windows users we suggest using 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, open an issue for this example on GitHub. Thank you!

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