BASICODE-2 subroutines

Overview of BASICODE-2

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General rules

BASICODE has a standard method of putting programs on a tape (frequency and ASCII codes)
BASICODE variables names are maximum two characters long. The first character has to be a capital letter and the optional second letter can be a number or a capital letter.
All variables beginning with O are reserved for use inside the BASICODE Translator.
BASICODE-2 reserved variable names are: A, AT, CN, CT, FN, FR, HO, IF, IN$, RV, SR, SR$, and VE
BY can't be used when incorporating BB4W (did not exists when BASICODE was developed) in list of BASICODE capable systems
String have a maximum length of 255 characters.
A BASICODE line is maximum 60 characters (also the DEF FN command).
BASICODE screens is preferable 40 chapters wide (but can be smaller like 25 characters)
(HO,VE) = (0,0) is top left corner of text screen

Allowed BASICODE-2 commands

The following commands are allowed: PRINT, INPUT, GOTO, GOSUB, RETURN, LET, FOR...TO...STEP, NEXT, IF..THEN (no ELSE), ON...GOTO, ON...GOSUB, RUN, STOP, END, DIM, READ, DATA, RESTORE, REM. No DEF FN (or DEFFN).

Allowed BASICODE functions

The following functions are allowed: TAB, ABS, SGN, INT, SQR, SIN, COS, TAN, ATN, EXP, LOG (natural logarithm), ASC, VAL, LEN, CHR$, LEFT$, MID$, RIGHT$.

Allowed BASICODE operators

The following operators were allowed: AND, OR, NOT, + (also with strings), -, *, /, ^ (exponent), <, =, >, <=, <>, >=

Subroutines

10 First line of subroutine module (one is not allowed to call this line from the BASICODE program)

20 System reset, clearing of variables, etc. Furthermore it starts the BASICODE program (one is only allowed to call this line from the BASICODE program at the start)

100 Clear screen.

110 Set cursor to position given by the variables HO and VE.

120 Return cursor position in variables HO and VE.

200 Read key stroke and return it in IN$.
no key pressed: IN$=""
IN$ holds only capital letters

210 Wait and read the pressed key and return it in IN$ (see also line 200)

250 Beep.

260 Return random number in RV (0 <= RV < 1).

270 Return the amount of free memory in FR

280 Disable the stop/break key (FR=1) or enable or (FR=0).

300 Convert number SR to string, returned in SR$

310 Convert number SR to string with a string length of CT and with CN places after decimal point; returned in SR$,

350 Print SR$ on the printer.

360 Carriage return and line feed on the printer.

Line numbers

The following line numbers method is used in BASICODE-2:
0 - 999: The BASICODE translator subroutines;
1000 - 1010: mandatory in the form of:
1000 A=<total memory space needed of all strings>: GOTO 20: REM program-name
1010 <rest of program>
1011 - 19999: The rest of the BASICODE program;
20000 - 24999: subroutines;
25000 - 29999: DATA-lines;
30000 - 32767: REM-lines with name and address of author.