BBC BASIC for the PDP-11 - Changes list

04-Sep-2008
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Evaluate:
&oXXX octal numbers, %xxxx binary numbers

Functions:
STRING$, STR$, LEFT$, RIGHT$, VAL, EVAL, LineNum, USR, CALL, RND

Commands:
LIST, REPEAT/UNTIL, GOTO/GOSUB/RETURN, RESTORE, IF, =, ENDPROC, TRACE

Tokens:
Detokeniser

31-Aug-2008
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Interface:
SOUND ON|OFF, =TIME$ checks for null return, GET$#chn, BPUT#chn,s$
GCOL c, COLOUR l,[p|r,g,b], PLOT x,y, SOUND, ENVELOPE

Commands:
NumberToString does integer hex and decimal

Functions:
Added binary functions to dispatch table, OR, EOR, AND, +, -, *, /, DIV
Full general integer arithmetic now fully implemented

Evaluate:
Full seven-level recusive evaluator written, hex numbers, double quotes

Stack:
Push and pop items from BASIC stack, prechecks non-string arguments
before dispatching to function code

Tokens:
Added 'Missing ' token to use in error messages.

12-Feb-2008
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HostIO:
IO_Init
IO calls vector to subroutines
IO_Init sets tty to raw/noecho
quit sets tty to noraw/echo
word0 does delete with vdu 8,32,8
RDCH/WRCH use direct TRAP calls
CLI checks for *Quit command

GeneralIO:
printR0 processes COUNT
IO_ReadLine calls OSWORD 0
IO_Escape generates error if escape state

SysVars:
Added SV_Escape
Added IO calls vector table
Vector table has default UNIX_* entries

Commands:
Command table uses dest-$
Command table is 80-FF
STOP temp. used for QUIT
PRINT uses test code
ERROR, STOP, NEW, LIST done
PAGE=, LOMEM=, HIMEM= done

28-Jan-2008
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Startup:
Doesn't clear sysvars - done by loader

Execute:
Error handler, ON ERROR dispatch
REPORT, RUN, CHAIN

Tokens:
Uses Acorn-style token table
Tokeniser written - needs optimising

Interface:
CLS, CLG, COLOUR, MODE, =MODE, =POS, =VPOS, OSCLI, DRAW, MOVE, PLOT, GCOL
VDU gives 'missing comma'
close, bput, ptr, ext, load, loadprogram
save, =ptr, =ext, =bget, =eof,
oscli, =oscli, adval

Evaluate:
EvalXXX check for char, then evaluate integer
temp. simple integer and string evaluation
   
Functions:
=<program functions>
 
Commands:
PRINT works fully, number conversion not yet implemented