GB Basic

GB Basic
General
Author	Jeff Frohwein
Type	Other Apps
Version	2.1
License	Shareware
System	CGB, DMG
Last Updated	2001/02/17
Links
Download
Website
Source

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 language specs.

Controls

A - Enter

B - Select

Select - Caps Lock

Start - Backspace

Select+Start - Break

Screenshots

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