Allen Systems - BASIC-52 BASIC Interpreter

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BASIC-52
BASIC Interpreter for the 8051

Specifications

8051 Compatible

Full-featured BASIC

Floating-point Operations

Build-in Control Constructs

Overview
BASIC-52 is a full-featured BASIC interpreter for Allen Systems' MICRO LAB-51 single board computer. It is burned into the 8K byte Flash Memory of the 89S8252 chip used on the board. BASIC-52 offers floating-point operations and most standard BASIC contructs. It also has non-standard commands and features which facilitate its use in process control applications.

BASIC-52 is a versatile and expandable interpreter by design. The user has access to system interrupts, and there are provisions for calling user supplied assembly language routines. User BASIC programs can be saved to disk on the host PC computer. It is also possible to save multiple BASIC programs to battery-backed RAM on the MICRO LAB-51 board.

A variety of dedicated functions are assigned to I/O lines on the 89S8252 chip by the interpreter. The P1.2 line of Port 1 is a pulse width modulation output which is controlled by the PWM command. P1.7 is a serial printer output line. The interpreter can recognize an external interrupt at External Interrupt 1 on -INT1 (P3.3).

The MICRO LAB-51 single board computer is a great hardware platform for BASIC-52. It has a prototyping area with access to the board's data bus, address bus, control lines, and chip selects. As a result, custom user circuitry can easily be added to the board. BASIC-52 allows the user to quickly test out any circuitry installed on the board.

BASIC-52 Commands

ABS	DATA	INT	ONERR	PRINT#	SGN	UI0
AND	DBY	IP	ONEX1	PRINT	SIN	UI1
ASC	DIM	LD@	ONTIME	(F)PROG	SPC	UO0
ATN	DO-UNTIL	LEN	OR	PUSH	SQR	UO1
BAUD	DO-WHILE	LET	PCON	PWM	ST@	USING
CALL	END	LIST	PRG	RAM	STOP	XBY
CBY	EXP	LIST#	PH0.	RCAP2	STRING	XFER
CLEAR	FREE	LOG	PH0.@	REM	TAB	XTAL
CLEARI	GET	MTOP	PH1.	RESTORE	TAN	+,-,,/,*
CLEARS	GOSUB	NEW	PH1.#	RETI	TCON	=,<,>,>
CLOCK0	GOTO	NEXT	PH1.@	RETURN	TIME	>,<,>=,<=
CLOCK1	IDLE	NOT	PI	RND	TIMER0
CONT	IE	NULL	POP	ROM	TIMER1
COS	IF-THEN-ELSE	ON-GOSUB	PORT1	RROM	TIMER2
CR	INPUT	ON-GOTO	PRINT	RUN	TMOD

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