Spectrum ROM: Memory map

Address	Description
0000	THE 'START'
0008	THE 'ERROR' RESTART
0010	THE 'PRINT A CHARACTER' RESTART
0013	Unused
0018	THE 'COLLECT CHARACTER' RESTART
0020	THE 'COLLECT NEXT CHARACTER' RESTART
0025	Unused
0028	THE 'CALCULATOR' RESTART
002B	Unused
0030	THE 'MAKE BC SPACES' RESTART
0038	THE 'MASKABLE INTERRUPT' ROUTINE
0053	THE 'ERROR-2' ROUTINE
005F	Unused
0066	THE 'NON-MASKABLE INTERRUPT' ROUTINE
0074	THE 'CH-ADD+1' SUBROUTINE
007D	THE 'SKIP-OVER' SUBROUTINE
0095	THE TOKEN TABLE
0205	THE KEY TABLES
028E	THE 'KEYBOARD SCANNING' SUBROUTINE
02BF	THE 'KEYBOARD' SUBROUTINE
031E	THE 'K-TEST' SUBROUTINE
0333	THE 'KEYBOARD DECODING' SUBROUTINE
03B5	THE 'BEEPER' SUBROUTINE
03F8	THE 'BEEP' COMMAND ROUTINE
046E	THE 'SEMI-TONE' TABLE
04AA	THE 'PROGRAM NAME' SUBROUTINE (ZX81)
04C2	THE 'SA-BYTES' SUBROUTINE
053F	THE 'SA/LD-RET' SUBROUTINE
0556	THE 'LD-BYTES' SUBROUTINE
05E3	THE 'LD-EDGE-2' AND 'LD-EDGE-1' SUBROUTINES
0605	THE 'SAVE, LOAD, VERIFY and MERGE' COMMAND ROUTINES
07CB	THE 'VERIFY' CONTROL ROUTINE
0802	THE 'LOAD A DATA BLOCK' SUBROUTINE
0808	THE 'LOAD' CONTROL ROUTINE
08B6	THE 'MERGE' CONTROL ROUTINE
092C	THE 'MERGE A LINE OR A VARIABLE' SUBROUTINE
0970	THE 'SAVE' CONTROL ROUTINE
09A1	THE CASSETTE MESSAGES
09F4	THE 'PRINT-OUT' ROUTINES
0A11	THE 'CONTROL CHARACTER' TABLE
0A23	THE 'CURSOR LEFT' SUBROUTINE
0A3D	THE 'CURSOR RIGHT' SUBROUTINE
0A4F	THE 'CARRIAGE RETURN' SUBROUTINE
0A5F	THE 'PRINT COMMA' SUBROUTINE
0A69	THE 'PRINT A QUESTION MARK' SUBROUTINE
0A6D	THE 'CONTROL CHARACTERS WITH OPERANDS' ROUTINE
0AD9	PRINTABLE CHARACTER CODES
0ADC	THE 'POSITION STORE' SUBROUTINE
0B03	THE 'POSITION FETCH' SUBROUTINE
0B24	THE 'PRINT ANY CHARACTER(S)' SUBROUTINE
0BDB	THE 'SET ATTRIBUTE BYTE' SUBROUTINE
0C0A	THE 'MESSAGE PRINTING' SUBROUTINE
0C3B	THE 'PO-SAVE' SUBROUTINE
0C41	THE 'TABLE SEARCH' SUBROUTINE
0C55	THE 'TEST FOR SCROLL' SUBROUTINE
0D4D	THE 'TEMPORARY COLOUR ITEMS' SUBROUTINE
0D6B	THE 'CLS' COMMAND ROUTINE
0DAF	THE 'CLEARING THE WHOLE DISPLAY AREA' SUBROUTINE
0DD9	THE 'CL-SET' SUBROUTINE
0DFE	THE 'SCROLLING' SUBROUTINE
0E44	THE 'CLEAR LINES' SUBROUTINE
0E88	THE 'CL-ATTR' SUBROUTINE
0E9B	THE 'CL-ADDR' SUBROUTINE
0EAC	THE 'COPY' COMMAND ROUTINE
0ECD	THE 'COPY-BUFF' SUBROUTINE
0EDF	THE 'CLEAR PRINTER BUFFER' SUBROUTINE
0EF4	THE 'COPY-LINE' SUBROUTINE
0F2C	THE 'EDITOR' ROUTINES
0FA0	THE 'EDITING KEYS' TABLE
0FA9	THE 'EDIT KEY' SUBROUTINE
0FF3	THE 'CURSOR DOWN EDITING' SUBROUTINE
1007	THE 'CURSOR LEFT EDITING' SUBROUTINE
100C	THE 'CURSOR RIGHT EDITING' SUBROUTINE
1015	THE 'DELETE EDITING' SUBROUTINE
101E	THE 'ED-IGNORE' SUBROUTINE
1024	THE 'ENTER EDITING' SUBROUTINE
1031	THE 'ED-EDGE' SUBROUTINE
1059	THE 'CURSOR UP EDITING' SUBROUTINE
1076	THE 'ED-SYMBOL' SUBROUTINE
107F	THE 'ED-ERROR' SUBROUTINE
1097	THE 'CLEAR-SP' SUBROUTINE
10A8	THE 'KEYBOARD INPUT' SUBROUTINE
111D	THE 'LOWER SCREEN COPYING' SUBROUTINE
1190	THE 'SET-HL' AND 'SET-DE' SUBROUTINES
11A7	THE 'REMOVE-FP' SUBROUTINE
11B7	THE 'NEW' COMMAND ROUTINE
12A2	THE 'MAIN EXECUTION' LOOP
1391	THE REPORT MESSAGES
1539	THE COPYRIGHT MESSAGE
1555	Report G - No room for line
155D	THE 'MAIN-ADD' SUBROUTINE
15AF	THE 'INITIAL CHANNEL INFORMATION'
15C4	Report J - Invalid I/O device
15C6	THE 'INITIAL STREAM DATA'
15D4	THE 'WAIT-KEY' SUBROUTINE
15E6	THE 'INPUT-AD' SUBROUTINE
15EF	THE 'MAIN PRINTING' SUBROUTINE
1601	THE 'CHAN-OPEN' SUBROUTINE
1615	THE 'CHAN-FLAG' SUBROUTINE
162D	THE 'CHANNEL CODE LOOK-UP' TABLE
1634	THE 'CHANNEL 'K' FLAG' SUBROUTINE
1642	THE 'CHANNEL 'S' FLAG' SUBROUTINE
164D	THE 'CHANNEL 'P' FLAG' SUBROUTINE
1652	THE 'MAKE-ROOM' SUBROUTINE
1664	THE 'POINTERS' SUBROUTINE
168F	THE 'COLLECT A LINE NUMBER' SUBROUTINE
169E	THE 'RESERVE' SUBROUTINE
16B0	THE 'SET-MIN' SUBROUTINE
16D4	THE 'RECLAIM THE EDIT-LINE' SUBROUTINE
16DB	THE 'INDEXER' SUBROUTINE
16E5	THE 'CLOSE #' COMMAND ROUTINE
1701	THE 'CLOSE-2' SUBROUTINE
1716	THE 'CLOSE STREAM LOOK-UP' TABLE
171C	THE 'CLOSE STREAM' SUBROUTINE
171E	THE 'STREAM DATA' SUBROUTINE
1736	THE 'OPEN #' COMMAND ROUTINE
175D	THE 'OPEN-2' SUBROUTINE
177A	THE 'OPEN STREAM LOOK-UP' TABLE
1781	THE 'OPEN-K' SUBROUTINE
1785	THE 'OPEN-S' SUBROUTINE
1789	THE 'OPEN-P' SUBROUTINE
1793	THE 'CAT, ERASE, FORMAT and MOVE' COMMAND ROUTINES
1795	THE 'LIST and LLIST' COMMAND ROUTINES
17F5	THE 'LLIST' ENTRY POINT
17F9	THE 'LIST' ENTRY POINT
1855	THE 'PRINT A WHOLE BASIC LINE' SUBROUTINE
18B6	THE 'NUMBER' SUBROUTINE
18C1	THE 'PRINT A FLASHING CHARACTER' SUBROUTINE
18E1	THE 'PRINT THE CURSOR' SUBROUTINE
190F	THE 'LN-FETCH' SUBROUTINE
1925	THE 'PRINTING CHARACTERS IN A BASIC LINE' SUBROUTINE
196E	THE 'LINE-ADDR' SUBROUTINE
1980	THE 'COMPARE LINE NUMBERS' SUBROUTINE
1988	Unused
198B	THE 'FIND EACH STATEMENT' SUBROUTINE
19B8	THE 'NEXT-ONE' SUBROUTINE
19DD	THE 'DIFFERENCE' SUBROUTINE
19E5	THE 'RECLAIMING' SUBROUTINE
19FB	THE 'E-LINE-NO' SUBROUTINE
1A1B	THE 'REPORT AND LINE NUMBER PRINTING' SUBROUTINE
1A48	THE SYNTAX TABLES
1B17	THE 'MAIN PARSER' OF THE BASIC INTERPRETER
1B28	THE STATEMENT LOOP
1B6F	THE 'SEPARATOR' SUBROUTINE
1B76	THE 'STMT-RET' SUBROUTINE
1B8A	THE 'LINE-RUN' ENTRY POINT
1B9E	THE 'LINE-NEW' SUBROUTINE
1BB2	THE 'REM' COMMAND ROUTINE
1BB3	THE 'LINE-END' ROUTINE
1BBF	THE 'LINE-USE' ROUTINE
1BD1	THE 'NEXT-LINE' ROUTINE
1BEE	THE 'CHECK-END' SUBROUTINE
1BF4	THE 'STMT-NEXT' ROUTINE
1C01	THE 'COMMAND CLASS' TABLE
1C0D	THE 'COMMAND CLASSES - +00, +03 and +05'
1C1F	THE 'COMMAND CLASS +01' ROUTINE
1C22	THE 'VARIABLE IN ASSIGNMENT' SUBROUTINE
1C4E	THE 'COMMAND CLASS +02' ROUTINE
1C56	THE 'FETCH A VALUE' SUBROUTINE
1C6C	THE 'COMMAND CLASS +04' ROUTINE
1C79	THE 'EXPECT NUMERIC/STRING EXPRESSIONS' SUBROUTINE
1C96	THE 'SET PERMANENT COLOURS' SUBROUTINE
1CBE	THE 'COMMAND CLASS +09' ROUTINE
1CDB	THE 'COMMAND CLASS +0B' ROUTINE
1CDE	THE 'FETCH A NUMBER' SUBROUTINE
1CEE	THE 'STOP' COMMAND ROUTINE
1CF0	THE 'IF' COMMAND ROUTINE
1D03	THE 'FOR' COMMAND ROUTINE
1D86	THE 'LOOK-PROG' SUBROUTINE
1DAB	THE 'NEXT' COMMAND ROUTINE
1DDA	THE 'NEXT-LOOP' SUBROUTINE
1DEC	THE 'READ' COMMAND ROUTINE
1E27	THE 'DATA' COMMAND ROUTINE
1E39	THE 'PASS-BY' SUBROUTINE
1E42	THE 'RESTORE' COMMAND ROUTINE
1E4F	THE 'RANDOMIZE' COMMAND ROUTINE
1E5F	THE 'CONTINUE' COMMAND ROUTINE
1E67	THE 'GO TO' COMMAND ROUTINE
1E7A	THE 'OUT' COMMAND ROUTINE
1E80	THE 'POKE' COMMAND ROUTINE
1E85	THE 'TWO-PARAM' SUBROUTINE
1E94	THE 'FIND INTEGERS' SUBROUTINE
1EA1	THE 'RUN' COMMAND ROUTINE
1EAC	THE 'CLEAR' COMMAND ROUTINE
1EED	THE 'GO SUB' COMMAND ROUTINE
1F05	THE 'TEST-ROOM' SUBROUTINE
1F1A	THE 'FREE MEMORY' SUBROUTINE
1F23	THE 'RETURN' COMMAND ROUTINE
1F3A	THE 'PAUSE' COMMAND ROUTINE
1F54	THE 'BREAK-KEY' SUBROUTINE
1F60	THE 'DEF FN' COMMAND ROUTINE
1FC3	THE 'UNSTACK-Z' SUBROUTINE
1FC9	THE 'LPRINT and PRINT' COMMAND ROUTINES
1FDF	THE 'PRINT CONTROLLING' SUBROUTINE
1FF5	THE 'PRINT A CARRIAGE RETURN' SUBROUTINE
1FFC	THE 'PRINT ITEMS' SUBROUTINE
2045	THE 'END OF PRINTING' SUBROUTINE
204E	THE 'PRINT POSITION' SUBROUTINE
2070	THE 'ALTER STREAM' SUBROUTINE
2089	THE 'INPUT' COMMAND ROUTINE
21B9	THE 'IN-ASSIGN' SUBROUTINE
21D6	THE 'IN-CHAN-K' SUBROUTINE
21E1	THE 'COLOUR ITEM' ROUTINES
2294	THE 'BORDER' COMMAND ROUTINE
22AA	THE 'PIXEL ADDRESS' SUBROUTINE
22CB	THE 'POINT' SUBROUTINE
22DC	THE 'PLOT' COMMAND ROUTINE
2307	THE 'STK-TO-BC' SUBROUTINE
2314	THE 'STK-TO-A' SUBROUTINE
2320	THE 'CIRCLE' COMMAND ROUTINE
2382	THE 'DRAW' COMMAND ROUTINE
247D	THE 'INITIAL PARAMETERS' SUBROUTINE
24B7	THE 'LINE-DRAWING' SUBROUTINE
24FB	THE 'SCANNING' SUBROUTINE
250F	THE 'SCANNING QUOTES' SUBROUTINE
2522	THE 'SCANNING TWO CO-ORDINATES' SUBROUTINE
2530	THE 'SYNTAX-Z' SUBROUTINE
2535	THE 'SCANNING SCREEN$' SUBROUTINE
2580	THE 'SCANNING ATTRIBUTES' SUBROUTINE
2596	THE SCANNING FUNCTION TABLE
25AF	THE 'SCANNING UNARY PLUS' ROUTINE
25B3	THE 'SCANNING QUOTE' ROUTINE
25E8	THE 'SCANNING BRACKET' ROUTINE
25F5	THE 'SCANNING FN' ROUTINE
25F8	THE 'SCANNING RND' ROUTINE
2627	THE 'SCANNING PI' ROUTINE
2634	THE' SCANNING INKEY$' ROUTINE
2668	THE 'SCANNING SCREEN$' ROUTINE
2672	THE 'SCANNING ATTR' ROUTINE
267B	THE 'SCANNING POINT' ROUTINE
2684	THE 'SCANNING ALPHANUMERIC' ROUTINE
268D	THE 'SCANNING DECIMAL' ROUTINE
26C9	THE 'SCANNING VARIABLE' ROUTINE
2795	THE TABLE OF OPERATORS
27B0	THE TABLE OF PRIORITIES
27BD	THE 'SCANNING FUNCTION' SUBROUTINE
28AB	THE 'FUNCTION SKIPOVER' SUBROUTINE
28B2	THE 'LOOK-VARS' SUBROUTINE
2951	THE 'STACK FUNCTION ARGUMENT' SUBROUTINE
2996	THE 'STK-VAR' SUBROUTINE
2A52	THE 'SLICING' SUBROUTINE
2AB1	THE 'STK-STORE' SUBROUTINE
2ACC	THE 'INT-EXP' SUBROUTINE
2AEE	THE 'DE,(DE+1)' SUBROUTINE
2AF4	THE 'GET-HL*DE' SUBROUTINE
2AFF	THE 'LET' COMMAND ROUTINE
2BF1	THE 'STK-FETCH' SUBROUTINE
2C02	THE 'DIM' COMMAND ROUTINE
2C88	THE 'ALPHANUM' SUBROUTINE
2C8D	THE 'ALPHA' SUBROUTINE
2C9B	THE 'DECIMAL TO FLOATING POINT' SUBROUTINE
2D1B	THE 'NUMERIC' SUBROUTINE
2D22	THE 'STK-DIGIT' SUBROUTINE
2D28	THE 'STACK-A' SUBROUTINE
2D2B	THE 'STACK-BC' SUBROUTINE
2D3B	THE 'INTEGER TO FLOATING-POINT' SUBROUTINE
2D4F	THE 'E-FORMAT TO FLOATING-POINT' SUBROUTINE (offset +3C)
2D7F	THE 'INT-FETCH' SUBROUTINE
2D8C	THE 'POSITIVE-INT-STORE' SUBROUTINE
2D8E	THE 'INT-STORE' SUBROUTINE
2DA2	THE 'FLOATING-POINT TO BC' SUBROUTINE
2DC1	THE 'LOG(2↑A)' SUBROUTINE
2DD5	THE 'FLOATING-POINT TO A' SUBROUTINE
2DE3	THE 'PRINT A FLOATING-POINT NUMBER' SUBROUTINE
2F8B	THE 'CA=10*A+C' SUBROUTINE
2F9B	THE 'PREPARE TO ADD' SUBROUTINE
2FBA	THE 'FETCH TWO NUMBERS' SUBROUTINE
2FDD	THE 'SHIFT ADDEND' SUBROUTINE
3004	THE 'ADD-BACK' SUBROUTINE
300F	THE 'SUBTRACTION' OPERATION (offset +03)
3014	THE 'ADDITION' OPERATION (offset +0F)
30A9	THE 'HL=HL*DE' SUBROUTINE
30C0	THE 'PREPARE TO MULTIPLY OR DIVIDE' SUBROUTINE
30CA	THE 'MULTIPLICATION' OPERATION (offset +04)
31AF	THE 'DIVISION' OPERATION (offset +05)
3214	THE 'INTEGER TRUNCATION TOWARDS ZERO' SUBROUTINE (offset +3A)
3293	THE 'RE-STACK TWO' SUBROUTINE
3297	THE 'RE-STACK' SUBROUTINE (offset +3D)
32C5	THE TABLE OF CONSTANTS
32D7	THE TABLE OF ADDRESSES
335B	THE 'CALCULATE' SUBROUTINE
33A2	THE 'SINGLE OPERATION' SUBROUTINE (offset +3B)
33A9	THE 'TEST 5-SPACES' SUBROUTINE
33B4	THE 'STACK NUMBER' SUBROUTINE
33C0	THE 'MOVE A FLOATING-POINT NUMBER' SUBROUTINE (offset +31)
33C6	THE 'STACK LITERALS' SUBROUTINE (offset +34)
33F7	THE 'SKIP CONSTANTS' SUBROUTINE
3406	THE 'MEMORY LOCATION' SUBROUTINE
340F	THE 'GET FROM MEMORY AREA' SUBROUTINE (offset +41)
341B	THE 'STACK A CONSTANT' SUBROUTINE (offset +3F)
342D	THE 'STORE IN MEMORY AREA' SUBROUTINE (offset +40)
343C	THE 'EXCHANGE' SUBROUTINE (offset +01)
3449	THE 'SERIES GENERATOR' SUBROUTINE (offset +3E)
346A	THE 'ABSOLUTE MAGNITUDE' FUNCTION (offset +2A)
346E	THE 'UNARY MINUS' OPERATION (offset +1B)
3492	THE 'SIGNUM' FUNCTION (offset +29)
34A5	THE 'IN' FUNCTION (offset +2C)
34AC	THE 'PEEK' FUNCTION (offset +2B)
34B3	THE 'USR' FUNCTION (offset +2D)
34BC	THE 'USR STRING' FUNCTION (offset +19)
34E9	THE 'TEST-ZERO' SUBROUTINE
34F9	THE 'GREATER THAN ZERO' OPERATION (offset +37)
3501	THE 'NOT' FUNCTION (offset +30)
3506	THE 'LESS THAN ZERO' OPERATION (offset +36)
350B	THE 'ZERO OR ONE' SUBROUTINE
351B	THE 'OR' OPERATION (offset +07)
3524	THE 'NUMBER AND NUMBER' OPERATION (offset +08)
352D	THE 'STRING AND NUMBER' OPERATION (offset +10)
353B	THE 'COMPARISON' OPERATIONS (offsets +09 to +0E, +11 to +16)
359C	THE 'STRING CONCATENATION' OPERATION (offset +17)
35BF	THE 'STK-PNTRS' SUBROUTINE
35C9	THE 'CHR$' FUNCTION (offset +2F)
35DE	THE 'VAL' AND 'VAL$' FUNCTIONS (offsets +18, +1D)
361F	THE 'STR$' FUNCTION (offset +2E)
3645	THE 'READ-IN' SUBROUTINE (offset +1A)
3669	THE 'CODE' FUNCTION (offset +1C)
3674	THE 'LEN' FUNCTION (offset +1E)
367A	THE 'DECREASE THE COUNTER' SUBROUTINE (offset +35)
3686	THE 'JUMP' SUBROUTINE (offset +33)
368F	THE 'JUMP ON TRUE' SUBROUTINE (offset +00)
369B	THE 'END-CALC' SUBROUTINE (offset +38)
36A0	THE 'MODULUS' SUBROUTINE (offset +32)
36AF	THE 'INT' FUNCTION (offset +27)
36C4	THE 'EXPONENTIAL' FUNCTION (offset +26)
3713	THE 'NATURAL LOGARITHM' FUNCTION (offset +25)
3783	THE 'REDUCE ARGUMENT' SUBROUTINE (offset +39)
37AA	THE 'COSINE' FUNCTION (offset +20)
37B5	THE 'SINE' FUNCTION (offset +1F)
37DA	THE 'TAN' FUNCTION (offset +21)
37E2	THE 'ARCTAN' FUNCTION (offset +24)
3833	THE 'ARCSIN' FUNCTION (offset +22)
3843	THE 'ARCCOS' FUNCTION (offset +23)
384A	THE 'SQUARE ROOT' FUNCTION (offset +28)
3851	THE 'EXPONENTIATION' OPERATION (offset +06)
386E	Unused
3D00	Character set
5C00	KSTATE - Used in reading the keyboard
5C08	LAST-K - Last key pressed
5C09	REPDEL - Time that a key must be held down before it repeats
5C0A	REPPER - Delay between successive repeats of a key held down
5C0B	DEFADD - Address of arguments of user defined function
5C0D	K-DATA - Second byte of colour controls entered from keyboard
5C0E	TVDATA - Colour, AT and TAB controls going to television
5C10	STRMS - Addresses of channels attached to streams
5C36	CHARS - 256 less than address of character set
5C38	RASP - Length of warning buzz
5C39	PIP - Length of keyboard click
5C3A	ERR-NR - One less than the error report code
5C3B	FLAGS - Various flags to control the BASIC system
5C3C	TV-FLAG - Flags associated with the television
5C3D	ERR-SP - Address of item on machine stack to use as error return
5C3F	LIST-SP - Return address from automatic listing
5C41	MODE - Specifies K, L, C, E or G cursor
5C42	NEWPPC - Line to be jumped to
5C44	NSPPC - Statement number in line to be jumped to
5C45	PPC - Line number of statement being executed
5C47	SUBPPC - Number within line of statement being executed
5C48	BORDCR - Border colour
5C49	E-PPC - Number of current line
5C4B	VARS - Address of variables
5C4D	DEST - Address of variable in assignment
5C4F	CHANS - Address of channel data
5C51	CURCHL - Address of information used for input and output
5C53	PROG - Address of BASIC program
5C55	NXTLIN - Address of next line in program
5C57	DATADD - Address of terminator of last DATA item
5C59	E-LINE - Address of command being typed in
5C5B	K-CUR - Address of cursor
5C5D	CH-ADD - Address of the next character to be interpreted
5C5F	X-PTR - Address of the character after the '?' marker
5C61	WORKSP - Address of temporary work space
5C63	STKBOT - Address of bottom of calculator stack
5C65	STKEND - Address of start of spare space
5C67	BREG - Calculator's B register
5C68	MEM - Address of area used for calculator's memory
5C6A	FLAGS2 - More flags
5C6B	DF-SZ - The number of lines in the lower part of the screen
5C6C	S-TOP - The number of the top program line in automatic listings
5C6E	OLDPPC - Line number to which CONTINUE jumps
5C70	OSPCC - Number within line of statement to which CONTINUE jumps
5C71	FLAGX - Various flags
5C72	STRLEN - Length of string type destination in assignment
5C74	T-ADDR - Address of next item in parameter table
5C76	SEED - The seed for RND
5C78	FRAMES - Frame counter
5C7B	UDG - Address of first user defined graphic
5C7D	COORDS - Coordinates of last point plotted
5C7F	P-POSN - Column number of printer position
5C80	PR-CC - Address of next position for LPRINT to print at
5C82	ECHO-E - Column and line number of end of input buffer
5C84	DF-CC - Address in display file of PRINT position
5C86	DF-CCL - Like DF-CC for lower part of screen
5C88	S-POSN - Column and line number for PRINT position
5C8A	S-POSNL - Like S-POSN for lower part of screen
5C8C	SCR-CT - Scroll counter
5C8D	ATTR-P - Permanent current colours
5C8E	MASK-P - Used for transparent colours
5C8F	ATTR-T - Temporary current colours
5C90	MASK-T - Temporary transparent colours
5C91	P-FLAG - More flags
5C92	MEMBOT - Calculator's memory area
5CB0	NMIADD - Non-maskable interrupt address
5CB2	RAMTOP - Address of last byte of BASIC system area
5CB4	P-RAMT - Address of last byte of physical RAM
5CB6	Channel information