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8-Bit Software

The BBC and Master Computer Public Domain Library

BASIC ROM Routines

MENU: Introduction/News Routines listed in Address order Routines listed by Category BASIC ROM documentation by Christopher Dewhurst BASIC4r32

BASIC IV Routines (Listed by Category)

BASIC Keywords:

Keywords that perform no function by themselves, as the keyword is activated by another
Keyword (they cause the rest of the program line to be skipped) : DATA, DEF

Keywords that have no function (they cause the program line to be skipped): REM

Keywords that only have meaning in relation with other Keywords: ERROR (ON), ELSE (IF), THEN (IF)

A
ABS	ACS	ADVAL	AND
ASC	ASN	ATN	AUTO

B
BGET	BPUT

C
CALL	CHAIN	CHR$	CLEAR
CLG	CLS	CLOSE	COLOUR
COS	COUNT

D
DEG	DELETE	DIM	DIV
DRAW

E
EDIT	END	ENDPROC	ENVELOPE
EOF	EOR	ERL	ERR
EVAL	EXP	= EXT	EXT =

F
FALSE	FN	FOR

G
GCOL	GET	GET$	GOSUB
GOTO

H
=HIMEM	HIMEM=

I
IF	INKEY	INKEY$	INPUT
INPUT#	INSTR(	INT

L
LEFT$(	LEN	LET	LIST
LISTO	LN	LOAD	LOCAL
LOG	=LOMEM	LOMEM=

M
MID$(	MOD	MODE	MOVE

N
NEW	NEXT	NOT

O
OLD	ON	OPENIN	OPENOUT
OPENUP	OR	OSCLI

P
=PAGE	PAGE=	PI	PLOT
POINT(	POS	PRINT	PRINT#
(PRINT) quote (')	(PRINT) SPC	(PRINT) TAB(	PROC
=PTR	PTR =

R
RAD	READ	RENUMBER	REPEAT
REPORT	RESTORE	RETURN	RIGHT$(
RND	RUN

S
SAVE	SGN	SIN	SOUND
SPC	SQR	STOP	STR$
STRING$

T
TAB(	TAN	=TIME	TIME=
=TIME$	TIME$=	TOP	TRACE
TRUE

U
UNTIL	USR

V
VAL	VPOS	VDU

W
WIDTH

BASIC Language Functionality (Non-Keyword):

'?' and '!' address peek/poke operators

'$' address peek/poke operator

'!' and '?' address modifier operators

'=' Return from a Function Call (FN)

'=' and other relational operators

'[' Begin Assembly

'^' Operator (raise to Power)

String Operations:

'=' and other relational operators

Compare String values

Load SWA with String Value

Push String to Stack

Pop String from Stack

Set String variable

String Addition

Integer Operations:

'/' Operator

'=' and other relational operators

'^' Operator (raise to Power)

Check if Integer and Convert if Float

Compare Integer values

Compliment Result

Convert Floating-Point to Integer

Convert Integer to Floating-Point

Extract Hex Integer

Get Integer result of expression

Get Integer result of expression and check for closing bracket

Get Result of expression from BASIC Text pointer A & convert to Integer

Get Integer value at PTR B

Integer Compliment

Integer Addition

Integer Division

Integer Subtraction

Integer Multiplication

Integer Positive

Integer Reverse Order Complement

IWA = 8-bit or 16-bit Integer

Load Integer from Zero Page Address

Load IWA with Integer from Address

Load IWA with 1-byte Integer value

Pop Integer from BASIC Stack

Pop Integer from BASIC Stack (Zp)

Push Integer to BASIC Stack

Save Integer to Address

Save Integer to Zero Page Address

Set Numeric variable

Floating-Point Operations:

'+' Operator

'-' Operator

'*' Operator

'/' Operator

'=' and other relational operators

'<' Operator

'<=' Operator

'<>' Operator

'>' Operator

'>=' Operator

'^' Operator (raise to Power)

Compare Float values

Compliment Result

Convert Floating-Point to Integer

Convert Integer to Floating-Point

Copy FWA to FWB

Copy FWB to FWA

Evaluate continued-fraction expansions Series

Floating-point addition

Floating-Point Addition Entry Point

Floating-Point Compliment

Floating-Point Constant Table

Floating-Point Division

Floating-Point Division Entry Point

Floating-Point Multiplication

Floating-Point Multiply Entry Point

Floating-Point Reciple

Floating-point Sign

Floating-Point Subtract Entry Point

Get & Check Float value

Load FWA with Float Variable (ain)

Multiply FWA Mantissa by 10

Normalise FWA#1

Normalise FWA#2

Pack FWA to Variable

Pop Float from Stack (to &4A,&4B)

Push FWA to Stack

Raise FWA to the power of the integer value in A

Round FWA Mantissa to 4 bytes

Set FWA to 1-byte value

Set Numeric variable

Split FWA (into Integer/Fractional part)

Store FWA to Temporary Variable

Unpack FP Variable to FWA

Unpack FP Variable to FWB

BASIC Language Internal Routines - Initialise & Error handler:

BASIC Error handler

BASIC ROM header

BASIC ROM Startup Initialisations

BASIC ROM Startup initialisations (part 2)

Initialise Page 7 & reset Variable pointers, etc...

Reset ON ERROR code pointer

BASIC Language Internal Routines - Tokenisation & lookup & Program Line number handling:

BASIC Execution Address List

BASIC Keyword List

Check & skip end of program line

Check for End of Statement

Check for Variable name character or digit (in A)

Check Program can be read correctly

Detokenise the requested Line Number and Set IWA to the Line Number value

Get Line Number & find Program Address of the Line Number

Increment [and read] pointer (&37, &38)

Next non-space Char PTRB

Next non-space Char PTRA

Remove Line Number (specified in the IWA) from the Program

Tokenise Command Line and Insert Line into Program

Replace untokenised ASCII value with a 1-byte token

Search for Program Line

Tokenise Command Line

Tokenise Line Number

BASIC Language Internal Routines - Data/Variable/Array handling:

Allocate space for new variable

Check for '=', evaluate expression & check end of statement

Check for Stack clash with Heap

Create new variable name in Variable Pointer table

Evaluate expression and check for closing bracket

Evaluate Variable/Value/BASIC Function/Open Bracket

Evaluate variable name & Create if new variable

Evaluate Variable name and return value address

Extract next field

Get address of specified Array element

Get Address of Variable

Load Variable

Pack FWA to Variable

Read byte from I/O processor memory location (at the address contained in the IWA)>

Set Variable to value from the BASIC Stack

Store FWA to Temporary Variable

Unpack FP Variable to FWB

BASIC Language Internal Routines - Input & Display:

Display current Line number to screen [for TRACE]
	Output ASCII character or BASIC Token (in ASCII text) to the screen
	Output character to the screen
Print Line Number on screen
Prompt for command line and execute the entered command(s)
Start new output line

BASIC Language Internal Routines - ASCII-Numeric conversion:

Ascnum (ASCII String to Binary Number)

ASCNUM: Extract Number at PTRB

ASCNUM: Handle Exponental values & complete number conversion

Floating-point divide by 10

Floating-point multiply by 10

Multiply FWA Mantissa by 10

NUMASC (convert Numeric value to ASCII value)

BASIC Language Internal Routines - Subroutine Handling (PROC/FN):

'=' Return from a Function Call (FN)

Add subroutine name to FN/PROC variable lookup table

Call Subroutine

Create Lookup Table reference for Subroutine Name

Load Variable & Push its value to the BASIC Stack

Lookup Subroutine Name in FN/PROC Variable Lookup Table

Miscellaneous:

Assemble Assembly instruction/statement

Calculate next Random Number Seed value

Execute next command line / program statement

Expression Handler

Get Filename and set parameter block Filename and Load address

Load/Save named file