Color Basic (non-Extended) Summary
Color Basic (non-Extended) Summary
Under construction, more details on the way
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Statements
AUDIO ON
AUDIO OFF
CLEAR n,h Reserve n bytes for strings, and
use only up to address h for BASIC
CLOAD
CLOAD name
CLOSE d
CLS c
CONT
CSAVE name
CSAVE name,A
DATA
DIM
END
EXEC
EXEC address
FOR .. TO .. STEP .. / NEXT
GOSUB linenumber
GOTO linenumber
IF .. THEN .. ELSE ..
INPUT
INPUT #-1
LIST
LLIST
MOTOR ON
MOTOR OFF
NEW
ON .. GOSUB ..
ON .. GOTO ..
OPEN m,#d,filename
POKE addr,value Save value at address addr, where
0 <= addr <= 65535, and 0 <= value <= 255
PRINT
PRINT #-1
PRINT #-2
PRINT TAB
PRINT @location
READ
REM
RESET (x,y)
RESTORE
RETURN
RUN
SET (x,y,c)
SKIPF
SKIPF name
SOUND tone,duration
STOP
Functions
ABS(num)
ASC(str)
CHR$(charcode)
EOF(f)
INKEY$
INSTR(first,str,substr)
INT(num)
JOYSTK(j) Reads joystick value j:
0=left_horiz 1=left_vert
2=right_horiz 3=right_vert
LEFT$(str,length)
LEN(str)
MEM
MID$(str,first,len)
POINT(x,y)
RIGHT$(str,length)
SGN(num)
SIN(num)
STR$(num)
USR(num) Calls the machine-language subroutine whose
address is stored at addresses 275 and 276
VAL(str)
VARPTR(var)
Operators
^ Exponentiation
-,+ Unary negative, positive
*,/ Multiplication, division
+,- Addition and concatenation, subtraction
<,>,=,<=,>=,<> Relational tests
NOT, AND, OR Logical operators
Error messages
Abbrev. Explanation
/0 Division by zero
AO File already open
BS Bad subscript - out of range
CN Cannot continue
DD Redimensioned array
DN Device number error
DS Direct statement in file
FC Illegal function call
FD Bad file data
FM Bad file mode
ID Illegal direct
IE Input past end of file
I/O Input/Output error
LS String too long
NF NEXT without FOR
NO File not open
OD Out of data
OM Out of memory
OS Out of string space
OV Overflow
RG RETURN without GOSUB
SN Syntax error
ST String formula too complex
TM Type mismatch
UL Undefined line number
ROM subroutines
NAME Addr Description
CSRDON A004 Gets the cassette going and reads the leader
BLKIN A006 Reads a block from the cassette
Must immediately follow CSRDON
Uses CBUFAD
returns BLKTYP and BLKLEN, cc.z=1 <-> okay
WRTLDR A00C Gets the cassette going and writes the leader
BLKOUT A008 Writes a block to the cassette
Must immediately follow WRTLDR
Uses CBUFAD, BLKTYP, and BLKLEN
CHROUT A002 Output a character to screen or printer
Uses DEVNUM, character to output in acca
POLCAT A000 Polls the keyboard for a character
returns cc.z=1 <-> no key, or acca=key code
JOYIN A00A Reads and saves all four joystick values
returns POTVAL through POTVAL+3
Memory map
Decimal Hex Description
0-105 0-69 Direct page RAM, OK for use by user ML programs
106-255 6A-FF Direct page RAM, used by BASIC
111 6F DEVNUM: 0=screen, FE=printer
125 7D BLKLEN: number of bytes in a block (0-255)
126 7C BLKTYP: block type: 0=header, 1=data, FF=end
127 7E CBUFAD: buffer address (two bytes?)
129 81 CSRERR: cassette error code
256-273 100-111 Internal use (jump vectors)
274-276 112-114 Address of USR routine
277-281 115-119 OK for use by user ML programs
282 11A Keyboard alpha-lock: FF=locked, 0=not
283-284 11B-11C Keyboard delay constant
285-337 11D-151 OK for use by user ML programs
338-345 152-159 Keyboard rollover table
346-349 15A-15D POTVAL: Joystick values
346 15A Right joystick, left/right value
347 15B up/down value
348 15C Left joystick, left/right value
349 15D up/down value
350-1023 15E-3FF Internal use
1024-1535 400-5FF Video memory
1536-32767 600-7FFF User's BASIC program
32768-40959 8000-9FFF [Extended Color BASIC]
40960-49151 A000-BFFF Color BASIC
49152-65279 C000-FEFF [Program pak memory]
65280-65535 FF00-FFFF I/O, machine configuration, reset vectors
Back to my top-level CoCo page
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12-Jun-98
yakowenk@csx.unxc.edu
(remove all "x"s to get a valid address)
