Targets supported by ugBASIC

SEGA SG-1000 (sg1000)

The sg1000 target has been supported by ugBASIC since version 1.9. The compiler can produce executable files in "rom" format.

How to start

You can use the SANDBOX to try the ugBASIC compiler, without download anything. This tool has been designed to quickly test whether the code you are writing compiles correctly and determines the desired results.

Since the source is compiled thanks to dedicated servers, separate from the browser you are using, some commands are not available: for example, you cannot load external files or resources by using the LOAD command.

If you need to develop a program with a complete tool, we recommend installing the command line executables (see below) or UGBASIC-IDE.

To write the source code you can use a simply text editor. You can save the program in a text file and then to call the compiler, in order to convert it into an form that your SEGA SG-1000 will be able to execute.

Otherwise you can download and use command line compilers. Here are the direct links to the compilers for the various operating systems. Select the most suitable one for your configuration:

In addition to compiling with the IDE, if you are using Linux or the command line version for Microsoft Windows, you can compile the BASIC source "source.bas" into an executable file using the following command:

ugbc.sg1000 -o executable.rom -O rom source.bas

It is therefore possible to run everything with an emulator, such as BlueMSX , or to create a phisical storage, as well.

A good starting point to learn ugBASIC for the sg1000 platform is the examples page. The examples provide insight into the syntax and usage of many of the commands and statements available for the language.

Since ugBASIC is an isomorphic language, which does not provide abstractions, it is possible that not all examples work on all targets: those labeled sg1000 can be compiled to generate executable files.

If you need help and support, the best place is the official forum, where you can find answers to your questions and receive help.

Games written for SEGA SG-1000 (more...)


Sokoban (Japanese: 倉庫番 or "warehouse keeper") is a puzzle-type video game in which the player pushes crates through a maze and tries to place them in their assigned location.

Examples for SEGA SG-1000 (more...)




Plotting and graphic modes

The ugBASIC language provides access to all documented graphics modes of the Motorola 6847 chipset, that can be selected using the SCREEN # command, and used with graphics primitives. This is the value of the various constants in the various versions:

0Text Mode40x24x20
1Graphic I32x24x16
2Graphic II256x192x16

Blitting images

Blitting operations are supported.

Calling and inlining assembly code

With the sg1000 target you can include assembly code for the Motorola 6809 processor. The code will be placed within the code bank.

Supported video standard

The ugBASIC compiler supports SG-1000 PAL (working frequency: 50 Hz) and NTSC (working frequency: 60 Hz) versions, and automatically detects the working frequency to calibrate the delays. In particular, it defines two constants with the same name, and initializes the constant TICKS PER SECOND.

This is the value of the various constants in the various versions:

SG-1000 (PAL)0 (FALSE)-1 (TRUE)50
SG-1000 (NTSC)-1 (TRUE)0 (FALSE)60

Audio support

The sg1000 target supports audio commands, as described on the documentation page.

Table of notes and frequencies

C C# D D# E F F# G G# A A# B
0 439439439439439439439439439439439439

Joystick and keyboard support

The ugBASIC language supports up to 2 joysticks, using the JOY(n) statement, and the keyboard. The left joystick is in port 0, while right joystick in port 1.