EMMA 02

RCA BASIC3 V1.1

Two versions of this BASIC are available: one running on the ELf machines in Emma 02 and one running from ROM on the RCA MDCS. On this site I have indicated where there ar differences with 'Elf version' and MDCS version'.

Start-up

To start RCA BASIC3 V1.1 in the Elf version first wait a few seconds (until the data display on the main Elf board shows 14) then press return followed by ‘C’ for a cold start and ‘W’ for a warm start.

To start RCA BASIC3 on the MDCS type 'B' from within the UT62 and then press return followed by ‘C’ for a cold start and ‘W’ for a warm start.

Commands

All RCA BASIC3 V1.1 Commands including some of the start addresses of these commands are listed below. Click on the command itself to get a description of command format and usage. The first address listed is for the Elf version, the second for the MDCS.

The commands BYE, DLOAD, DSAVE, PLOAD, PSAVE only work on the MCDS version.

ABS	@4B09 - @CDD9	INUM	@3B03
ASC	@3991 - @D15C	LEN	@4004
ATN	@3D06 - @D067	LET	@3500
BYE	@2997 - @B225	LIST	@2A68
CALL	@3B6B - @CF01	LOG	@3D0C
CHR$		MEM	@3FAC
CLD	@31D0 -  @B9ED	MID$
CLOSE	@2927 - @B19F	MOD	@22C2
CLS	@40F3 - @C6FF	NEW	@2833
COS	@3D03 - @D064	NEXT	@3E7B
DATA	@34FB - @C2FB	OUT	@2800
DEFINT	@48D8 - @C8DA	PEEK	@39DF
DEFUS	@44ED - @C8FA	PI	@38E2
DEG	@51F7	PLOAD	@2524
DIM	@3900	POKE	@40C1
DIN	@31B9	PRINT / PR	@4501 - @C900
DISINT	@422D	PSAVE	@273F
DLOAD	@2527	RAD	@51FA
DMAPT	@2FF8	READ	@4F6C
DOUT	@31A2	REM	@3FF9
DSAVE	@2742	RENUMBER	@3600
EDIT	@2600	RESTORE	@34EF
EF	@228C	RETURN	@3EAB
END	@30C9	RFLN	@26F5
ENINT	@47E1	RND	@3800
EOD	@41B9	RUN	@3276
EOP	@41B6	RUN+
EXIT	@51AF	SGN	@3899
EXP	@3D09	SIN	@3D00
FIXED	@3DE7	SQR	@3D0F
FNUM	@3E00	STQ	@27F5
FOR TO STEP	@3400	TAB
FORMAT	@50F0	TIN	@2FEA
FVAL	@398E	TOUT	@29F2
GOSUB	@3EB7	TRACE	@40E0
GOTO	@412A	USR	@3B6E
IF THEN	@4233	WAIT	@35DA
INP	@28C3	WFLN	@296C
INPUT	@3F74	QST	@2286
INT

Operators

Arithmetic operators

Unary minus	-	(first priority)
Exponentiation	↑	(first priority)
Multiply	*	(second priority)
Divide	/	(second priority)
Add	+	(third priority)
Subtract	-	(third priority)

Assignment operator

The assignment symbol is the equal sign ‘=‘.

Relational operators

Equality: =
Inequality: <>
Greater than: >
Less than: <
Greater than or equal to: >=
Less than or equal to: <=

Logical operators

AND
XOR
OR
NOT

Miscellaneous operators

:	separates statements on the same line
;	PRINT delimiter
,	PRINT delimiter
“	string delimiter
(	group terms
)	group terms
\..\	8 bit binary values
#	8 bit hexadecimal values
@	16 bit hexadecimal values

System Parameters

In the Elf version memory @5200-@5400 and in the MCDS version @0000-@0200 is used by the BASIC for storing data, usage for some of the addresses is explained below. MCDS addresses are shown, for the ELf version add @5200.

0000 - 005F	Line Buffer
0081 - 0082	DEFUS value
0083 - 0084	EOP (End Of Program) value
008A - 008D	In hook, call to input routine
008E - 0091	Out hook, call to output routine
0092 - 0093	End array/start string value
0094 - 0095	Start array value
0099 - 009A	EOD (End Of Data) and end string value
009B	X value TAB
009D	Flags
009E	Start address user RAM
009F - 00A2	Call to BASIC functions
00A3 - 00A6	Call to BASIC functions
00B1 - 00B2	DATA pointer
00BB	High byte memory end
00D0 - 00xx	Converted Line buffer, this will overwrite A - Z variable storage
0100 - 0168	Storage A, B, C.... Z, 4 bytes per variable