Tolik-Trek/ZX-SP-ROMs
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ZX-SP-ROMs/inc/system_variables.inc
Anatoliy Belyanskiy 51b40b7af5 Setup
2023-06-17 04:36:58 +10:00

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; ZX Spectrum system variables
; By Marcos Cruz (programandala.net)
; Last modified: 201803231837
; See change log at the end of the file
; ==============================================================
; ZX Spectrum +3
sys_nmiadd: equ 23728 ; (2)
; The system variable at 5CB0h (23728) was documented on previous models of the
; Spectrum as 'Not used'. It is now used on the +3 as an NMI jump vector. If an
; NMI occurs, this address is checked. If it contains a 0, then no action is
; taken. However, for any other (non-zero) value, a jump will be made to the
; address given by this variable. NMIs must not occur while the disk system is
; active.
SWAP_ROM: equ 23296 ; (0x5B00) (R16)
; Paging subroutine.
sys_stoo: equ 23312 ; (0x5B10) (R17)
; Paging subroutine. Entered with
; interrupts already disabled and AF, BC
; on the stack.
sys_younger: equ 23329 ; (0x5B21) (R9)
; Paging subroutine.
sys_regnuoy: equ 23338 ; (0x5B2A) (R16)
; Paging subroutine.
sys_onerr: equ 23354 ; (0x5B3A) (R24)
; Paging subroutine.
sys_oldhl: equ 23378 ; (0x5B52) (X2)
; Temporary register store while
; switching ROMs.
sys_oldbc: equ 23380 ; (0x5B54) (X2)
; Temporary register store while
; switching ROMs.
sys_oldaf: equ 23382 ; (0x5B56) (X2)
; Temporary register store while
; switching ROMs.
sys_target: equ 23384 ; (0x5B58) (N2)
; Subroutine address in ROM 3.
sys_retaddr: equ 23386 ; (0x5B5A) (X2)
; Return address in ROM 1.
sys_bankm: equ 23388 ; (0x5B5C) (X1)
; Copy of last byte output to I/O
; port 7FFDh (32765). This port
; is used to control the RAM
; paging (bits 0..2: page 0..7),
; screen selection (bit 3:
; 0=normal, 1=shadow),
; 'horizontal' ROM switch (bit 4:
; 0=128k editor, 1=48k BASIC) and
; added I/O disabling (bit 5).
; the This byte must be kept up
; to date with the last value
; output to the port if
; interrupts are enabled.
sys_ramrst: equ 23389 ; (0x5B5D) (X1)
; RST 8 instruction. Used by ROM 1 to
; report old errors to ROM 3.
sys_ramerr: equ 23390 ; (0x5B5E) (N1)
; Error number passed from ROM 1 to ROM
; 3. Also used by SAVE/LOAD as temporary
; drive store.
sys_baud: equ 23391 ; (0x5B5F) (2)
; RS232 bit period in T states/26. Set
; by FORMAT LINE.
sys_serfl: equ 23393 ; (0x5B61) (N2)
; Second-character-received-flag, and
; data.
sys_col: equ 23395 ; (0x5B63) (N1)
; Current column from 1 to width.
sys_width: equ 23396 ; (0x5B64) (1)
; Paper column width. Defaults to 80.
sys_tvpars: equ 23397 ; (0x5B65) (1)
; Number of inline parameters expected
; by RS232
sys_flags3: equ 23398 ; (0x5B66) (1)
; Various flags. Bits 0, 1, 6 and 7
; unlikely to be useful. Bit 2 is set
; when tokens are to be expanded on
; printing. Bit 3 is set if print output
; is RS232. The default (at reset) is
; Centronics. Bit 4 is set if a disk
; interface is present. Bit 5 is set if
; drive B: is present.
sys_bank678: equ 23399 ; (0x5B67) (X1)
; Copy of last byte output to I/O port
; 1FFDh (8189). This port is used to
; control the +3 extended RAM and ROM
; switching (bits 0..2 - if bit 0 is 0
; then bit 2 controls the 'vertical' ROM
; switch 02 and 13), the disk
; motor (bit 3) and Centronics strobe
; (bit 4). This byte must be kept up to
; date with the last value output to the
; port if interrupts are enabled.
sys_xloc: equ 23400 ; (0x5B68) (N1)
; Holds X location when using the
; unexpanded COPY command.
sys_yloc: equ 23401 ; (0x5B69) (N1)
; Holds Y location when using the
; unexpanded COPY command.
sys_oldsp: equ 23402 ; (0x5B6A) (X2)
; Old SP (stack pointer) when TSTACK is
; in use.
sys_synret: equ 23404 ; (0x5B6C) (X2)
; Return address for ONERR.
sys_lastv: equ 23406 ; (0x5B6E) (5)
; Last value printed by calculator.
sys_rcline: equ 23411 ; (0x5B73) (2)
; Current line being renumbered.
sys_rcstart: equ 23413 ; (0x5B75) (2)
; Starting line number for
; renumbering. The default value is 10.
sys_rcstep: equ 23415 ; (0x5B77) (2)
; Incremental value for renumbering. The
; default is 10.
sys_loddrv: equ 23417 ; (0x5B79) (1)
; Holds 'T' if LOAD, VERIFY, MERGE are
; from tape, otherwise holds 'A', 'B'
; or 'M'.
sys_savdrv: equ 23418 ; (0x5B7A) (1)
; Holds 'T' if SAVE is to tape,
; otherwise holds 'A', 'B' or 'M'.
sys_dumplf: equ 23419 ; (0x5B7B) (1)
; Holds the number of 1/216ths user for
; line feeds in 'COPY EXP'. This is
; normally set to 9. If problems are
; experienced fitting a dump onto a
; sheet of A4 paper, POKE this
; location with 8. This will reduce the
; size of the dump and improve the
; aspect ratio slightly. (The quality of
; the dump will be marginally degraded,
; however.)
sys_strip1: equ 23420 ; (0x5B7C) (N8)
; Stripe one bitmap.
sys_strip2: equ 23428 ; (0x5B84) (N8)
; Stripe two bitmap. This extends to
; 5B8Bh (23436).
sys_tstack: equ 23551 ; (0x5BFF) (X115)
; Temporary stack grows down from
; here. Used when RAM page 7 is switched
; in at top of memory (while executing
; the editor or calling +3DOS). it may
; safely go down to 5B8Ch (and across
; STRIP1 and STRIP2 if necessary). This
; guarantees at least 115 bytes of stack
; when BASIC calls +3DOS.
; ==============================================================
; ZX Spectrum 48K
sys_printer_buffer: equ 23296 ; (0x5B00)
sys_kstate: equ 23552 ; (n8) Used in reading the keyboard.
sys_kstate.1: equ 23553
sys_kstate.2: equ 23554
sys_kstate.3: equ 23555
sys_kstate.4: equ 23556
sys_kstate.5: equ 23557
sys_kstate.6: equ 23558
sys_kstate.7: equ 23559
sys_last_k: equ 23560 ; (nl) Stores newly pressed key.
sys_last_key: equ 23560
sys_repdel: equ 23561 ; (1) Time (in 50ths of a second
; in 60ths of a second in N. America) that a key must
; be held down before it repeats.
; This starts off at 35, but you can POKE in other values.
sys_repper: equ 23562 ; (1) Delay (in 50ths of a second in 60ths of a second
; in N. America) between successive repeats
; of a key held down: initially 5.
sys_defadd: equ 23563 ; (n2) Address of arguments of user defined function
; if one is being evaluated; otherwise 0.
sys_k_data: equ 23565 ; (nl) Stores 2nd byte of colour controls
; entered from keyboard.
sys_tvdata: equ 23566 ; (n2) Stores bytes of colour, AT and TAB controls
; going to television.
sys_tvdata2: equ 23567
sys_tvdata.high: equ 23567
sys_strms: equ 23568 ; (x38) Addresses of channels attached to streams.
sys_chars: equ 23606 ; (2) 256 less than address of character set
sys_rasp: equ 23608 ; (1) Length of warning buzz.
sys_pip: equ 23609 ; (1) Length of keyboard click.
; sys_err_nr is pointed by IY
sys_err_nr: equ 23610 ; (1) 1 less than the report code.
; Starts off at 255 (for 1) so PEEK 23610 gives 255.
sys_flags: equ 23611 ; (x1) Various flags to control the BASIC system.
sys_tv_flag: equ 23612 ; (x1) Flags associated with the television.
sys_err_sp: equ 23613 ; (x2) Address of item on machine stack
; to be used as error return.
sys_list_sp: equ 23615 ; (n2) Address of return address from automatic listing.
sys_mode: equ 23617 ; (n1) Specifies K, L, C. E or G cursor.
sys_newppc: equ 23618 ; (2) Line to be jumped to.
sys_nsppc: equ 23620 ; (1) Statement number in line to be jumped to.
; Poking first NEWPPC and then NSPPC
; forces a jump to a specified statement in a line.
sys_ppc: equ 23621 ; (2) Line number of statement currently being executed.
sys_subppc: equ 23623 ; (1) Number within line of statement being executed.
sys_bordcr: equ 23624 ; (1) Border colour * 8; also contains the attributes
; normally used for the lower half of the screen.
sys_e_ppc: equ 23625 ; (2) Number of current line (with program cursor).
sys_vars: equ 23627 ; (x2) Address of variables.
sys_dest: equ 23629 ; (n2) Address of variable in assignment.
sys_chans: equ 23631 ; (x2) Address of channel data.
sys_curchl: equ 23633 ; (x2) Address of information currently being used
; for input and output.
sys_prog: equ 23635 ; (x2) Address of BASIC program.
sys_nxtlin: equ 23637 ; (x2) Address of next line in program.
sys_datadd: equ 23639 ; (x2) Address of terminator of last DATA item.
sys_e_line: equ 23641 ; (x2) Address of command being typed in.
sys_k_cur: equ 23643 ; (2) Address of cursor.
sys_ch_add: equ 23645 ; (x2) Address of the next character to be interpreted.
sys_x_ptr: equ 23647 ; (2) Address of the character after the ? marker.
sys_worksp: equ 23649 ; (x2) Address of temporary work space.
sys_stkbot: equ 23651 ; (x2) Address of bottom of calculator stack.
sys_stkend: equ 23653 ; (x2) Address of start of spare space.
sys_breg: equ 23655 ; (n1) Calculator's b register.
sys_mem: equ 23656 ; (n2) Address of area used for calculator's memory.
; (Usually MEMBOT, but not always.)
sys_flags2: equ 23658 ; (1) More flags.
sys_df_sz: equ 23659 ; (x1) The number of lines (including one blank line)
; in the lower part of the screen.
sys_s_top: equ 23660 ; (2) The number of the top program line in automatic listings.
sys_oldppc: equ 23662 ; (2) Line number to which CONTINUE jumps.
sys_ospcc: equ 23664 ; (1) Number within line of statement
; to which CONTINUE jumps.
sys_flagx: equ 23665 ; (n1) Various flags.
sys_strlen: equ 23666 ; (n2) Length of string type destination in assignment.
sys_t_addr: equ 23668 ; (n2) Address of next item in syntax table
; (very unlikely to be useful).
sys_seed: equ 23670 ; (2) The seed for RND.
; This is the variable that is set by RANDOMIZE.
sys_frames: equ 23672 ; (3) 3 byte (least significant first), frame counter.
; Incremented every 20ms.
sys_udg: equ 23675 ; (2) Address of 1st user defined graphic.
sys_coords: equ 23677 ; (2) coordinates of last point plotted.
sys_coordx: equ 23677 ; (1) x-coordinate of last point plotted.
sys_coordy: equ 23678 ; (1) y-coordinate of last point plotted.
sys_p_posn: equ 23679 ; (1) 33 column number of printer position
sys_pr_cc: equ 23680 ; (1) Less significant byte of address
; of next position for LPRINT to print at
; (in printer buffer).
sys_unused0: equ 23681 ; (1) Not used.
sys_echo_e: equ 23682 ; (2) 33 column number and 24 line number
; (in lower half) of end of input buffer.
sys_df_cc: equ 23684 ; (2) Address in display file of PRINT position.
sys_dfccl: equ 23686 ; (2) Like DF CC for lower part of screen.
sys_s_posn: equ 23688 ; (x2) 33 column and 24 line number for PRINT position
sys_s_posx: equ 23688 ; (x1) 33 column number for PRINT position
sys_s_posy: equ 23689 ; (x1) 24 line number for PRINT position.
sys_s_posn2: equ 23689
sys_sposnl: equ 23690 ; (x2) Like S POSN for lower part
sys_scr_ct: equ 23692 ; (1) Counts scrolls:
; it is always 1 more than the number of scrolls that
; will be done before stopping with scroll? If you keep
; poking this with a number bigger than 1 (say 255), the
; screen will scroll on and on without asking you.
sys_attr_p: equ 23693 ; (1) Permanent current colours, etc
; (as set up by colour statements).
sys_mask_p: equ 23694 ; (1) Used for transparent colours, etc.
; Any bit that is 1 shows that the corresponding
; attribute bit is taken not from ATTR P, but from what
; is already on the screen.
sys_attr_t: equ 23695 ; (n1) Temporary current colours, etc
; (as set up by colour items).
sys_mask_t: equ 23696 ; (n1) Like MASK P, but temporary.
sys_p_flag: equ 23697 ; (1) More flags.
sys_membot: equ 23698 ; (n30) Calculator's memory area;
; used to store numbers that cannot
; conveniently be put on the calculator stack.
sys_unused1: equ 23728 ; (1) Not used.
sys_unused2: equ 23729 ; (1) Not used.
sys_ramtop: equ 23730 ; (2) Address of last byte of BASIC system area.
sys_p_ramt: equ 23732 ; (2) Address of last byte of physical RAM.
sys_p_ramt.high: equ 23733
; ==============================================================
; Change log
; 2014-12-17: Converted from the HTML version of the ZX Spectrum manual, with
; the help of Vim. Regulary improved afterwards.
;
; 2015-01-12: New: first two ZX Spectrum +3 variables.
;
; 2015-01-15: New: 'sys_flags3'.
;
; 2015-01-16: New: all ZX Spectrum +3 variables.
;
; 2015-05-24: Changes to make the file usable as symbols input file by
; z80dasm.
;
; 2015-09-06: Offset extracted to <zx_spectrum_system_variables_offsets.z80s>,
; because the z80dasm disassembler does not accept calculations in its input
; symbols file.
;
; 2016-08-05: Remove useless comment.
;
; 2016-08-15: Add individual bytes of sys_k_state; the second one is addressed
; by TR-DOS 5.03.
;
; 2018-03-09: Add `sys_printer_buffer`.
;
; 2018-03-23: Add `sys_tvdata.high`.
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