COLOR BASIC ROM

There were four versions of the Color BASIC ROM for the Tandy Color Computers.

One of the key differences between versions comes from different SAM chip setups for different RAM types and configurations.

1980 1.0 MC6883
1980 1.1 MC6883
1982 1.2 '783 SAM
1982 1.3 '785 SAM

Addresses taken from v1.2 of Color BASIC

ADDRESS	TOKEN	KEYWORD	DESCRIPTION
AD47	80	FOR	Start a loop
AE86	81	GO	Jump to line number
AEE3	82-84	REM '	Comments or remarks - Else uses this too?
AF14	85	IF	Start a conditional check
AEE0	86	DATA	Store data within a program
B8F7	87	PRINT	Write to the screen
AF42	88	ON	Start of multi-way branch
AFF5	89	INPUT	Read a line of text at a time
AE02	8A	END	The end of the program
B0F8	8B	NEXT	End of a loop
B34E	8C	DIM	Set aside memory for arrays
B046	8D	READ	Read a piece of data
AE75	8E	RUN	Start the program running
ADE4	8F	RESTORE	Start back at the first DATA item
AEC0	90	RETURN	Return from a subroutine
AE09	91	STOP	Stop the program at the current line
B757	92	POKE	Write a value to a memory address
AE30	93	CONT	Continue the program from a stop
B764	94	LIST	List program to screen
AE41	95	CLEAR	Clear RAM for string space
AD17	96	NEW	Initialize the BASIC memory map
A498	97	CLOAD	Cassette load
A44C	98	CSAVE	Cassette save
A5F6	99	OPEN	Open a file
A416	9A	CLOSE	Close files
B75E	9B	LLIST	List program to printer
A880	9C	SET	Draw a semigraphics pixel
A8B1	9D	RESET	Clear a semigraphics pixel
A910	9E	CLS	Clear screen
A7BD	9F	MOTOR	Tape drive motor control
A94B	A0	SOUND	Beep the speaker
A990	A1	AUDIO	Control the audio source
A53E	A2	EXEC	EXECute code at address
A5EC	A3	SKIPF	Skip tape file
	A4	TAB	Tabulation
	A5	TO	Token for TO in GO TO
	A6	SUB	Completion token for GOSUB
	A7	THEN	Completion token for IF
	A8	NOT	Boolean / Logical negation
	A9	STEP	FOR loop control
	AA	OFF	AUDIO and MOTOR control token
B9C5	AB	+	Addition operator
BACC	AC	*	Multiplication operator
B9BC	AC	-	Subtraction operator
BB91	AE	/	Division operator
B227	AF	EXP	Generates ?SN in Color BASIC, implemented in Extended Color BASIC
B2D5	B0	AND	Boolean / Logical AND operator
B2D4	B1	OR	Boolean / Logical OR operator
	B2	>	Greater Than operator
	B3	=	Equality operator
	B4	<	Less Than operator
A9B3	-	BIRQSV	Interrupt service handler
B141	-	EVAL	Evaluate a numeric expression
BC7A	FF80	SGN	Get the sign of a number positive or negative
BCEC	FF81	INT	Convert a number to an integer
BC93	FF82	ABS	Get absolute value of a signed number
B44A	FF83	USR	User defined function
BF1F	FF84	RND	Pseudo-random number generator
BF78	FF85	SIN	Sine of an angle
B750	FF86	PEEK	Read a value from a memory address
B681	FF87	LEN	Length of a string
B4FD	FF88	STR$	Convert a number to a string
B716	FF89	VAL	Convert a string to a number
B6A0	FF8A	ASC	ASCII code of first letter of string
B68C	FF8B	CHR$	Convert number to Control, ASCII, or graphics code string
A5CE	FF8C	EOF	End of file
A9C6	FF8D	JOYSTK	Read and report joysticks
B6AB	FF8E	LEFT$	Left part of a string
B6C8	FF8F	RIGHT$	Right part of a string
B6CF	FF90	MID$	Middle of a string
A8F5	FF91	POINT	Check color of a semigraphics pixel
A564	FF92	INKEY$	Get a key
B4EE	FF93	MEM	Free memory

Example code of how to disable the BASIC ROM and use the RAM underneath:
CMOC with nobasic example code

64K TRS-80 CoCo memory test | Sub-Etha Software
PCLEAR 0 to get more CoCo BASIC memory | Sub-Etha Software

Tandy Color Computer