OPTION TYPE UNSIGNED
 OPTION DEFAULT TYPE BYTE
 
 DIM actualAddress AS WORD = &H3008 
 DIM startingAddress AS WORD = &H3000
 DIM increment AS BYTE = 0
 
 SCREEN ON
 
 PROCEDURE drawHi
 
 	SHARED startingAddress
 
 	DIM filled AS BYTE = &HFF
 	DIM middle AS BYTE = &H18
 	DIM none AS BYTE = &H00
 	
 	' H (5x8 pixel)
 
 	POKE startingAddress, filled
 	INC startingAddress
 	POKE startingAddress, filled
 	INC startingAddress
 	POKE startingAddress, middle
 	INC startingAddress
 	POKE startingAddress, filled	
 	INC startingAddress
 	POKE startingAddress, filled
 	INC startingAddress
 
 	' I (5x8 pixel)
 
 
 	POKE startingAddress, none
 	INC startingAddress
 	POKE startingAddress, filled
 	INC startingAddress
 	POKE startingAddress, filled
 	INC startingAddress
 
 END PROC
 
 PROCEDURE clearHi
 
 	SHARED startingAddress
 
 	DIM index AS BYTE = &H00
 	DIM none AS BYTE = &H00
 
 	IF startingAddress > 8 THEN
 		startingAddress = startingAddress - 8
 	ELSE
 		startingAddress = 0
 	ENDIF
 	
 	DO
 		POKE startingAddress, none
 		INC startingAddress
 		INC index
 		EXIT IF index > 16
 	LOOP		
 	
 END PROC
 
 DO
 
 	IF increment = 0 THEN
 		INC actualAddress
 		IF actualAddress > &H300f THEN
 			increment = 1
 		ENDIF
 	ELSE
 		DEC actualAddress
 		IF actualAddress < &H3008 THEN
 			increment = 0
 		ENDIF
 	ENDIF
 	
 	clearHi[]
 	startingAddress = actualAddress
 	drawHi[]
 	WAIT 200 CYCLES
 	WAIT 200 CYCLES
 	WAIT 200 CYCLES
 	WAIT 200 CYCLES
 	WAIT 200 CYCLES
 	WAIT 200 CYCLES
 	WAIT 200 CYCLES
 	WAIT 200 CYCLES
 	WAIT 200 CYCLES
 	WAIT 200 CYCLES
 		
 LOOP
 

• bug.bas

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.

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 bug.bas -o example.xex
 altirra example.xex
 
 # Windows 
 ugbc.atari.exe bug.bas -o example.xex
 altirra example.xex

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 bug.bas -o example.xex
 altirra example.xex
 
 # Windows 
 ugbc.atarixl.exe bug.bas -o example.xex
 altirra example.xex

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 bug.bas -o example.prg
 x64sc example.prg
 
 # Windows 
 ugbc.c64.exe bug.bas -o example.prg
 x64sc example.prg

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.c64reu bug.bas -o example.prg
 x64sc -reu example.prg
 
 # Windows 
 ugbc.c64reu.exe bug.bas -o example.prg
 x64sc -reu example.prg

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 bug.bas -o example.prg
 yape example.prg
 
 # Windows 
 ugbc.plus4.exe bug.bas -o example.prg
 yape example.prg

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 bug.bas -o example.prg
 xplus4 example.prg
 
 # Windows 
 ugbc.plus4.exe bug.bas -o example.prg
 xplus4 example.prg

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 bug.bas -o example.bin
 xroar -rompath (your rom path) example.bin
 
 # Windows 
 ugbc.d32.exe bug.bas -o example.bin
 xroar.exe -rompath (your rom path) example.bin

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 bug.bas -o example.bin
 xroar -rompath (your rom path) example.bin
 
 # Windows 
 ugbc.d64.exe bug.bas -o example.bin
 xroar.exe -rompath (your rom path) example.bin

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 bug.bas -o example.k7
 dcmoto
 (choose BASIC 128)
 CLEAR,&H2FFF: LOADM"CASS:",R: EXEC
 
 # Windows 
 ugbc.pc128op.exe bug.bas -o example.k7
 dcmoto
 (choose example.k7)
 (choose BASIC 128)
 CLEAR,&H2FFF: LOADM"CASS:",R: EXEC

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 bug.bas -o example.k7
 dcmoto
 (choose BASIC 128)
 CLEAR,&H2FFF: LOADM"CASS:",R: EXEC
 
 # Windows 
 ugbc.pc128op.exe bug.bas -o example.k7
 dcmoto
 (choose example.k7)
 (choose BASIC 128)
 CLEAR,&H2FFF: LOADM"CASS:",R: EXEC

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 bug.bas -o example.prg
 xvic --memory 24k example.prg
 
 # Windows 
 ugbc.vic20.exe bug.bas -o example.prg
 xvic --memory 24k example.prg

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 bug.bas -o example.tap
 Speccy example.tap
 
 # Windows 
 ugbc.zx.exe bug.bas -o example.tap
 Speccy example.tap

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:

 # Linux 
 ugbc.msx1 bug.bas -o example.rom
 openmsx -cart example.rom
 
 # Windows 
 ugbc.msx1.exe bug.bas -o example.rom
 openmsx -cart example.rom

 # Linux 
 ugbc.msx1 bug.bas -o example.rom
 bluemsx example.rom
 
 # Windows 
 ugbc.msx1.exe bug.bas -o example.rom
 bluemsx example.rom

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:

 # Linux 
 ugbc.coleco bug.bas -o example.rom
 openmsx -machine \"COL - ColecoVision\" -cart example.rom
 
 # Windows 
 ugbc.coleco.exe bug.bas -o example.rom
 bluemsx -machine \"COL - ColecoVision\" example.rom

 # Linux 
 ugbc.coleco bug.bas -o example.rom
 bluemsx /machine \"COL - ColecoVision\" /rom1 example.rom
 
 # Windows 
 ugbc.coleco.exe bug.bas -o example.rom
 bluemsx  /machine \"COL - ColecoVision\" /rom1 example.rom

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 bug.bas -o example.rom
 bluemsx /machine \"SEGA - SC-3000\" /rom1 example.rom
 
 # Windows 
 ugbc.sc3000.exe bug.bas -o example.rom
 bluemsx  /machine \"SEGA - SC-3000\" /rom1 example.rom

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 bug.bas -o example.rom
 bluemsx /machine \"SEGA - SG-1000\" /rom1 example.rom
 
 # Windows 
 ugbc.sg1000.exe bug.bas -o example.rom
 bluemsx  /machine \"SEGA - SG-1000\" /rom1 example.rom

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!