Edit Infobox GB Homebrews: GB Basic

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{{#seo: |title=GameBrew |title_mode=append |image=gameboybasic.png |image_alt=GB Basic }} GB Basic is a floating-point BASIC interpreter for Game Boy that allows you to write & execute programs up to 7.4K bytes in size. If it is used in a cart with RAM then a program can be SAVEd and LOADed at a later time. Here are the [http://www.devrs.com/gb/files/gbbasic.txt language specs]. ==Controls== A - Enter B - Select Select - Caps Lock Start - Backspace Select+Start - Break == Screenshots == https://dlhb.gamebrew.org/gbhomebrews/gameboybasic.png https://dlhb.gamebrew.org/gbhomebrews/gameboybasic2.png == Changelog == '''V2.10''' * Replaced FAST & SLOW with SPEED 0 & SPEED 1 to conserve reserved keyword space. * Replaced REGBC x & REGDE y with REG x,y to conserve reserved keyword space. * Added SINIT & SOUT for RS232 serial & digital output on Nintendo MBC spare digital output pins. '''V2.00''' * Initial support for GB Colo(u)r. * Commands SLOW & FAST added to allow changing between single & double speed modes on the GBC. '''V1.22''' * Swapped command/button positions on intro screen. Suggestted by David Nathan. * Fixed bug where SOUND < 256 duration would play continuously. Reported by John Montalbano. * Fixed error messages for DIM that were not correct. Reported by Oliver Wittchow. * Entry of "2g.1" caused software lockup. Reported by Marc Rawer. '''V1.21''' * Individual servos pulses may now be turned off by issuing SERVO x,0. On many servos this lowers battery drain when they're not in use. '''V1.20''' * MAJOR BUG FIXES. * Added better handshaking to link port for reliable file download using GB Terminal. * Fixed bug in floating point conversion that would randomly mess up many functions due to interrupts. * Writing to screen is now much more reliable with no more random trash displayed on screen. * SERVO 0,0 now disables all servo output pulses. * Added MEMTOP, REGBC, REGDE, & USR commands. '''V1.10''' * Fixed bug that would randomly display line numbers incorrectly. * Game link port now supports external terminal I/O. * Added LINK command to configure game link port. * V1.08 didn't work on VGB. Haven't figured out why yet. '''V1.08''' * Shift & Caps Lock now supported on external keyboard. * CLS now redraws onscreen menu properly in text mode. * Basic commands can now be entered in lower or upper case. * DELAY added to 'first letter' list above. '''V1.07''' * Added SERVO command. * Changed DELAY increments from 1ms to 10ms in order to implement SERVO command. * Select Button is now a caps lock. * Credit screen now disappears after 4 seconds. * Carat symbol added to onscreen menu. * FOR,GOTO,INPUT,LIST,NEXT,PRINT,RUN & THEN now can be entered by first letter followed by period. '''V1.06''' * Fixed bugs in LIST options. Up & down buttons now speed up or slow down LIST command. Pressing break now halts LIST command. * Added SOUND command. '''V1.05''' * Added AUTO command. * Credit screen disappears after 10 seconds. '''V1.04''' * Select & Start are BOTH now required to break. * This was done to allow individual buttons to be pressed and read with the new KEYPAD command. * Added COLOR command. '''V1.03''' * Fixed 'cursor disappear' when arrow buttons pressed. * Greatly speeded up CLS command. * Added SCREEN, POINT, & LINE routines. * Break now works for lines that GOTO themselves. '''V1.02''' * Completed RENUM routine. * Added restore [line#] ability. * Added hex entry of numbers using prefix &h. '''V1.01''' * Rearranged on-screen keyboard. * Reassigned key controls. * Fixed exponent display problem. '''V1.0''' * Original release. == External links == * Author's website - http://www.devrs.com/gb/files/software.html

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