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boot.asm
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boot.asm
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;this is source is based on disassembly of the original Atari Z3 Interpreter G by Infocom
;later heavily gutted and rewriten by Jindroush in 2023
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;
; changes on top of original:
; -added three different disk layouts (SD_TWO_SIDE,SD_ONE_SIDE,DD_ONE_SIDE)
; -fixed non-czech-conforming get_arg1_obj_prop_ptr_to_temp2
; -slightly fixed random keyword behavior (still does not reseed, will need real motivation to use prng)
; -added charset, turning on charset, translation table for CZ_LANG, just for testing
; 23_06_16 kubecj -preliminary work on extmem support, all bugs fixed, czech tests in non-extmem build work now flawlessly
; 23_06_26 kubecj -extmem mostly finished, there are still random bugs which would be hard to find
; -added check for 48KB of ram / 130KB of ram in extmem
; -fixed latest bugs in extmem. Remaining should be only save/restore, verify also fails - probably sector mismatch again
; -fixed sector mismatch in verify
; 23_06_27 kubecj -maybe all bugs fixed in EXTMEM changes, incl. save and restore
; 23_06_28 kubecj -simplified attribute bitmask creation
; 23_06_28 kubecj -this should be final Z3-only version. Capabilities include SD, SD-twoside, DD support, CZ Lang support and possibility of
; EXTMEM support on 130XE+ machines.
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;
; 23_06_28 kubecj -first attempt to run z4 code
; -augmented code jumptables to be full
; -one of the call instructions fixed to be *4P compatible
; 23_06_29 kubecj -seems like call_1s and call_2s seems to work as call_vs(?)
; -added call_vs2 functionality with all 8 parameters
; 23_07_01 kubecj -fixed all object addressing for z4
; -fixed all property addressing for z4 (I wish I could read the docs more carefully, to spot difference
; between bit 5 and 5 bits)
; -added EXTMEM compatibility for the above
; -understood there is something in the original implementation of relative jumps I don't understand
; -so rewrote it in a way I understand (ie sign extend and then do 24bit addition)
; -added dummy calls to all missing i/o functions
; -allowed non-system sizes of DD diskettes (LONG_MEDIA)
; -in this moment AMFV starts, but crashes soon because of missing read_char opcode
; 23_07_02 kubecj -added more or less dummy read_char
; -fixed computation of object pointer. This proves again that CZECH does not check all the corners.
; -changed parser to use 9 byte words and lookup of 6 byte dictionary words
; 23_07_04 kubecj -added several screen oriented opcodes, more or less by guessing
; -there are definitely some problems regarding the object creation/moving/removal
; -also, there is some jumping bug which goes into the middle of the nowhere
; -the problem is that most of the screen stuff can't be displayed on 40 column screen and the decision must be made
; if I want to use software/XEP80/VBXE
; 23_07_05 kubecj -found bug in scan_table implementation which seems to have caused all the yesterday's mysterious bugs
; -fixed z4 verify
; -fixed some header flags. Found out Infocom did not assign interpreter number for Atari.
; -fixed get_prop_len and get_prop_addr for Z4 long props (2 byte prop header)
; -also learned how to f**k with original copy protection in AMFV
; 23_07_07 kubecj -added VBXE driver, looks very nice. Lots of work with buffering / output_streams follows.
; 23_07_09 kubecj -added buffering control, decided to flush buffer when buffering is set to 0
; -added output stream functionality
; -found out that there is either bug in my implementation of function calls, or the stack in this version is too small
; -because when there are several 1s calls, each call with unconsumed sp result takes 1 stack position,
; -and if there is a loop over them...
; -fixed read_char to print cursor and allow pushing enter (returning $0d on enter)
; -in this very moment all 4 Z4 games look visually great. Also [more] must be re-implemented.
; -Wonder what would compiling to Z3 do.
; -in todo there is still save/restore.
; 23_07_10 kubecj -save & restore in z4 appear to work. Not sure if $refre could be called from restore routine (nope!)
; -in any case, dynamic memory in z4 is yuge and I have no idea how long space should be reserved for it
; -Trinity has $9310 of dynamic memory.
; 23_07_11 kubecj -displaying [MORE] now even in vbxe mode
; -not sure why it asks for [MORE] at the end of AMFV first screen (now sure - because screen model is broken)
; -should also display 'story is loading' in a better way
; 23_07_14 kubecj -now everything looks okay in all 4 Z4 games
; -removed almost all A40 code to standalone driver, need to check out the rest of the code and also Z3 dependencies
; -Z3 Stationfall has parsing problem when compiled with EXTMEM
; 23_07_15 kubecj -Stationfall fixed, took hours ;-) - caused by random memory overwrite in A40_cls caused by off-by-one error
; -fixed size of cursor
; -moved pmg stuff to graphics drivers as macros. also pmg init should be moved there(?)
; -currently z4 & z3 seem to run well with both a40/vbxe graphics drivers
; -just some originally z3 prints should be fixed to work in nicely (status, loading story etc)
; 23_07_17 kubecj -fixed color of pmg cursor
; -added S80, works on the first try, which is surprising. Missing [more]
; -moved caching page compares to graphics drivers, good for now (in the future, needs to put large stack there first)
; -unified graphics drivers api to limit number of if/elseifs in main code
; -fixed display of not enough memory error (for example Z3 Stationfall and S80 won't work together on 64KB machine)
; -fixed display of Z3 status line on 80 col drivers
; -added [more] for S80
; -loading story now looks more elegant, getting rid of top-of-the-screen-printing
; 23_07_18 kubecj -large stack implemented, works okay
; -there is a problem with PMG, as 1-line PMG must be on 2K boundary
; 23_07_20 kubecj -problem with PMG in VBXE - it seems this depends on core version, 1.26 looks good.
; -this problem is visible only in Bureaucracy forms, when the cursor is above the text
; -first attempt to run z5 code, implemented two of the call opcodes
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;
; 23_07_21 kubecj -fixed z5 call, added two other
; -added extended opcodes, implemented shifts
; -added all(?) header settings for z5
; -added empty set_font and set_color (in fact, set_color may work for VBXE?)
; -some changes regarding calls with 'n'
; -also added number of parameters to stack save, for check_args
; 23_07_22 kubecj -added mostly empty aread, modified get keyboard string, but these are not correct/unfinished
; -fixed bug in shift with 0
; -print_table, copy_table implemented, fixed and reimplemented scan_table
; -fixed get_prop_len 0 to conform to specification
; 23_07_23 kubecj -implemented catch/throw. Now praxis passes with 3 failures in streams (more or less expected)
; -verified Z4 still works, Z3 also works
; -currently CIO is dropped altogether in A40 mode, all graphics drivers rewritten to output
; only real characters on put_char and won't modify ROWCRS/COLCRS, the whole functionality is only in
; interpreter's lowlevel_ functions. That should help us separate the graphics mode from zmachine screen model.
; -fixed print_table to print newline only between lines. This fixes output of Sherlock/Borderzone.
; -removed check in split_window for max number of lines. It created troubles in Zork I InvisiClues screens.
; -two additional bugfixes in print_table - skip must be tested first if provided, COLSCR must be preserved on new line
; -another print_table fix ;) - instead of new_line, just increment ROWCRS
; -small fix in print_a_character to skip 0 leads to 100% praxix test pass
; -fixed quite a devious bug in copy_table and now I have to wonder wherever else it may lurk. Basically, I was reading
; directly from extmem, but since I load only until dynamic memory end, I was reaching uninitialized memory.
; loading 64KB would solve it for me 'for free' though
; -currently it seems that all z5 games mostly work, so the trinity of read/read_from_keyboard/tokenise must be written to
; finish it
; 23_07_24 kubecj -tried making font3 available in S80, it mostly works (and we're getting dangerously close to $3FFF)
; 23_07_25 kubecj -added screen flush when waiting for char (fixes Beyond Zork start)
; 23_07_26 kubecj -z8 support just to test it's same as Z5 (works out of the box). The only difference is in packed addresses.
; -z7 works as well. So right now we have support for Z3-Z4-Z5-Z7-Z8 (Z5-Z7-Z8 not fully finished yet). Z6 is a no-no.
; -z5 added check for 0 values in find_in_vocab number of words and in copy_table size, Beyond Zork started to work
; -also, for extended memory we now load everything up to $FF always, for long stories. Otherwise we need to compute the
; real length, which duplicates the code for us...
; -added alphabet table processing, just for testing, not production quality at all (one game with it only)
; -again there was a bug in print_table, that's one cursed function ;)
; 23_07_27 kubecj -partial input for z5+ should now be working
; -rewrote alphabet processing also for ascii-zchar-zstr conversion
; 23_08_01 kubecj -just fixing bits here and there to get rid of all TODOs
; 23_08_03 kubecj -trying to speed up things, mostly in cache invalidation
; 23_08_04 kubecj -verified that all implemented op_ext don't touch memory, also they don't have variable number of pars
; -it seems that also all opvar_ are correct now
; -added some cache invalidation fixes for zdata
; -implemented save & restore compatible with z4+, but found out the graphics state must be saved & restored as well
; 23_08_05 kubecj -save/restore for z4+ fixed and verified to work correctly on AMFV and BZork.
; -fixed particulary nasty bug when calling N call with 0. Fixes HHtG SG.
; 23_08_09 kubecj -in call 0 fixed bug I created, while I fixed another bug ;)
; -changed wording in save
; -allowed external setting of interpreter version (for Beyond Zork)
; -changed initialization order in naked_interpreter to survive reset
; -fixed encoding of escaped characters (it's 5, 6, lo, hi for one special char)
; 23_08_10 kubecj -slightly modified s80 fonts
; -changed asm->binary including of fonts for S80
; 23_08_12 kubecj -0.9.2 added PORTB writes in VBXE functions touching MEMACB. Will see if it helps.
; 23_08_27 kubecj -0.9.4 added S64 driver. Looks good, just AMFV has problems in menu.
; 23_08_28 kubecj -added font3 for S64 driver, not perfect, but usable. Not sure if something must be done regarding the speed of driver.
; 23_09_12 kubecj -0.9.5 fixed error while displaying very early messages in Z3 stories. Did it by completely disabling status line
; unless static memory is wholly loaded
; -fixed two disk sector computation (leading to error 12)
; -reverted back to code/data buffer cross invalidation. It was unclear why this was needed, but now it makes sense.
; There is only one resource - cache, and two users - code & data readers. Because there is no way how to lock
; some sectors to be used by one specific reader, it's always needed to invalidate buffers and its pointers in order
; to prevent pointers pointing to buffers which were meanwhile re-loaded for the other reader. This whole caching
; thing is a mess now and I have to re-think if complete rewrite isn't what's actually needed.
; This bug must have been lurking there for many versions, but only in base memory Z3 with large story - Planetfall,
; the cache was only two sectors so it almost immediately hit.
; 23_09_16 kubecj -PunyInform needs get_cursor, implemented
; 23_09_17 kubecj -found serious bug in call implementation - when the number of call parameters is larger than number of locals
; the locals get overwriten without being preserved on stack. Not sure if any of the originals may have code
; like this. (Inform6 veneer routine CA__Pr didn't work as expected in second 'before' call).
; 23_09_18 kubecj -slightly fixed font3 in s64 driver
; 23_09_23 kubecj 0.9.6 s64peedy gonzales build with faster s64 driver
; 23_11_26 kubecj 0.9.7 slight bugfixes regarding screen outputs, splitting and [more]. Fixes help display in Savoir Faire
; 23_11_27 kubecj fixed stupid bug in scan_table when called with size of 0 - automatically should return false
version_hihi = 0
version_hi = 9
version_lo = 7
;known bugs
;the buffering is not okay when the unbuffered print does not start on the leftmost column. String then rolls over, instead of printing newline
;todo
;check all out-of-game printing functions and make sure they don't interfere with changes regarding buffering etc.
;write all-extmem-tester (set portb to X and write X to $4000+X, in second pass verify which ones survived?)
;timed input for z4+
;terminating characters from header for z5+
;also all special input characters. Not sure if this could be implemented in a reasonable way, when original games are unaware of A800?
;later
;vbxe 1 - use colors in text mode
;vbxe 2 - use graphics mode, put_char would use multiple fonts via blitting, scroll via blitting, all colors and stuff. In fact, not sure
; about this, because I don't understand vbxe screen model at all. If I have 8bits/1byte wide font, how do I create colored pixels of it?
;think of loading whole game to ram if 320+ (needs memory discovery code)
;split dd diskette
;think if using RANDOM is better than transplanting some PRNG from CC65
opt h-
;for z3 split story
.ifndef SD_TWO_SIDE
SD_TWO_SIDE = 0
.endif
;for z3 short story which fits real sd, or long story with fits unreal sd
.ifndef SD_ONE_SIDE
SD_ONE_SIDE = 0
.endif
;for z3 short story which fits real sd, or long story with fits unreal sd
.ifndef ED_ONE_SIDE
ED_ONE_SIDE = 0
.endif
;for long story to fit on one real disk
.ifndef DD_ONE_SIDE
DD_ONE_SIDE = 0
.endif
;unreal disk
.ifndef LONG_MEDIA
LONG_MEDIA = 0
.endif
.if SD_ONE_SIDE || SD_TWO_SIDE || DD_ONE_SIDE
MAX_SECTORS = 720
.elseif ED_ONE_SIDE
MAX_SECTORS = 1040
.endif
.if ZVER = 3
MAX_STORY_SIZE_HIHI = 1
.elseif ZVER = 4 || ZVER = 5
MAX_STORY_SIZE_HIHI = 3
.elseif ZVER = 7 || ZVER = 8
MAX_STORY_SIZE_HIHI = 7
.endif
;this is interpreter called from external menu
;so far, the configuration is from beginning of $80
;$80,$81 - story start sector
;later maybe color settings?
.ifndef NAKED_INTERPRETER
NAKED_INTERPRETER = 0
.endif
.if NAKED_INTERPRETER
.if ! DD_ONE_SIDE && ! LONG_MEDIA
.error "Invalid compilation switches"
.endif
.endif
;DEBUG_PRINTS=1
.ifndef DEBUG_PRINTS
DEBUG_PRINTS=0
.endif
;czech language support (not all messages translated yet)
.ifndef CZ_LANG
CZ_LANG = 0
.endif
;disables printing of [more] and waiting for key (more or less debugging tool)
SUPPRESS_MORE = 0
;video drivers
A40 = 1 ;software gr.2 driver, 40 columns, not using CIO
VBXE = 2 ;VBXE just one color txt, 80 columns
S80 = 3 ;software gr.8 driver, 80 columns
S64 = 4 ;software gr.8 driver, 64 columns
;zcode version to compile
.ifndef ZVER
ZVER = 3
.endif
;large stack - larger than 256 stack words
.ifndef LARGE_STACK
LARGE_STACK = 0
.endif
;extended memory support
.ifndef EXTMEM
EXTMEM = 0
.endif
.if CZ_LANG
;CHAR_* are valid only for Capek encoding - for strings output via CIO (inverted only?)
;ZCHAR_* are zchar substitutes of accented characters - for strings output via unpacked zchar print
CHAR_PARLEFT = $06
CHAR_PARRIGHT = $24
CHAR_l_a_carka = $2A
ZCHAR_l_a_carka = $CF
CHAR_l_c_hacek = $27
ZCHAR_l_c_hacek = $D6
CHAR_C_hacek = $03
CHAR_l_e_hacek = $25
ZCHAR_l_e_hacek = $DA
CHAR_l_i_carka = $29
ZCHAR_l_i_carka = $DB
CHAR_I_carka = $09
ZCHAR_I_carka = $B2
CHAR_l_o_carka = $0F
CHAR_l_y_carka = $60
CHAR_l_z_hacek = $28
ZCHAR_l_z_hacek = $CB
CHAR_R_hacek = $12
ZCHAR_R_hacek = $BC
.endif
;atari characters needed
atari_eol = $9b
atari_backspace = $7e
;zscii/ascii chars
ascii_cr = $0D
ascii_lf = $0A
ascii_tab = $09
ascii_space = $20
;----------------------------------------------------------------------------------------------------------
;hardware regs
;gtia
GTIA_REGS = $D000
HPOSM0 = $D004
SIZEM = $D00C
GRACTL = $D01D
CONSOL = $D01F
;pokey
AUDF1 = $D200
AUDC1 = $D201
AUDCTL = $D208
RANDOM = $D20A
IRQEN = $D20E
SKCTL = $D20F
;pia
PORTB = $D301
;antic
PMBASE = $D407
;os vectors
SIOV = $e459
CIOV = $e456
DSKINV = $e453
;disk commands
DDEVIC =$300 ;DEVICE BUS ID
DUNIT =$301 ;UNIT NUMBER
DCOMND =$302 ;BUS COMMAND
DSTATS =$303 ;CMD TYPE/OP STATUS
DBUFLO =$304 ;DATA BUFFER
DBUFHI =$305 ;DATA BUFFER
DTIMLO =$306 ;DEVICE TIMEOUT
DBYTLO =$308 ;BUFFER LENGTH
DBYTHI =$309 ;BUFFER LENGTH
DAUX1 =$30A
DAUX2 =$30B
;cio
ICHID_0 =$340 ;HANDLER INDEX OFFSET
ICDNO_0 =$341 ;DEVICE NUMBER
ICCOM_0 =$342 ;DEVICE COMMAND
ICSTA_0 =$343 ;OP STATUS
ICBAL_0 =$344 ;BUFFER ADDRESS
ICBAH_0 =$345 ;BUFFER ADDRESS
ICPT_0 =$346 ;PUT BYTE RTN-1
ICBLL_0 =$348 ;BUFFER LENGTH
ICBLH_0 =$349 ;BUFFER LENGTH
ICAX1_0 =$34A ;AUX 1
ICAX2_0 =$34B
ICSPR_0 =$34C
ICAX3_0 =$34C
ICAX4_0 =$34D
ICAX5_0 =$34E
ICAX6_0 =$34F
CIO_OPEN = $03
CIO_CLOSE = $0C
CIO_PUT_BINARY = $0B
CIO_PRINT = $09
;os zpage vars
TRAMSZ = $06
BOOT = $09
DOSVEC_LO = $0A
DOSVEC_HI = $0B
DOSINI_LO = $0C
DOSINI_HI = $0D
POKMSK = $10
RTCLOK = $12
ROWCRS = $54
COLCRS = $55
RAMTOP = $6A
;os vars
SDMCTL = $22F
SDLSTL = $230
SDLSTH = $231
COLDST = $244
GPRIOR = $26f
PCOLR0 = $2c0
PCOLR1 = $2c1
PCOLR2 = $2c2
PCOLR3 = $2c3
COLOR0 = $2c4
COLOR1 = $2c5
COLOR2 = $2c6
COLOR3 = $2c7
COLOR4 = $2c8
RAMSIZ = $2e4
CHBAS = $2f4
CH = $2fc
end_of_48k_ram_page = $C000
;we need to compute this also for other densities
.if( SD_TWO_SIDE || SD_ONE_SIDE || ED_ONE_SIDE )
STARTING_STORY_SECTOR = [ ( ( end_of_boot - boot_header ) / $80 ) + 1 ]
.elseif( DD_ONE_SIDE )
STARTING_STORY_SECTOR = [ ( ( end_of_boot - boot_header ) / $100 ) + 1 + 3 ]
.else
.error
.endif
.if EXTMEM
story_hdr_begin = $4000 ;not a magic, but address of extended memory window
.else
story_hdr_begin = end_of_boot + 7
.endif
story_hdr_version = story_hdr_begin + $00
story_hdr_flags = story_hdr_begin + $01
story_hdr_release_hi = story_hdr_begin + $02
story_hdr_release_lo = story_hdr_begin + $03
story_hdr_resident_memory_hi = story_hdr_begin + $04
story_hdr_resident_memory_lo = story_hdr_begin + $05
story_hdr_pc_hi = story_hdr_begin + $06
story_hdr_pc_lo = story_hdr_begin + $07
story_hdr_dict_hi = story_hdr_begin + $08
story_hdr_dict_lo = story_hdr_begin + $09
story_hdr_obj_hi = story_hdr_begin + $0A
story_hdr_obj_lo = story_hdr_begin + $0B
story_hdr_glob_hi = story_hdr_begin + $0C
story_hdr_glob_lo = story_hdr_begin + $0D
story_hdr_dynamic_hi = story_hdr_begin + $0E
story_hdr_dynamic_lo = story_hdr_begin + $0F
story_hdr_flags2_hi = story_hdr_begin + $10
story_hdr_flags2_lo = story_hdr_begin + $11
;12 13 14 15 16 17 unused
story_hdr_abbr_hi = story_hdr_begin + $18
story_hdr_abbr_lo = story_hdr_begin + $19
story_hdr_flen_hi = story_hdr_begin + $1A
story_hdr_flen_lo = story_hdr_begin + $1B
story_hdr_crc_hi = story_hdr_begin + $1C
story_hdr_crc_lo = story_hdr_begin + $1D
story_hdr_int = story_hdr_begin + $1E
story_hdr_int_ver = story_hdr_begin + $1F
story_hdr_screen_height = story_hdr_begin + $20
story_hdr_screen_width = story_hdr_begin + $21
story_hdr_screen_width_u_hi = story_hdr_begin + $22
story_hdr_screen_width_u_lo = story_hdr_begin + $23
story_hdr_screen_height_u_hi = story_hdr_begin + $24
story_hdr_screen_height_u_lo = story_hdr_begin + $25
story_hdr_screen_unitsx = story_hdr_begin + $26
story_hdr_screen_unitsy = story_hdr_begin + $27
story_hdr_rout_offs_hi = story_hdr_begin + $28
story_hdr_rout_offs_lo = story_hdr_begin + $29
story_hdr_str_offs_hi = story_hdr_begin + $2A
story_hdr_str_offs_lo = story_hdr_begin + $2B
story_hdr_screen_default_bk_col = story_hdr_begin + $2C
story_hdr_screen_default_fg_col = story_hdr_begin + $2D
story_hdr_termchars_hi = story_hdr_begin + $2E
story_hdr_termchars_lo = story_hdr_begin + $2F
;30 31 - z6 only
story_hdr_standard_hi = story_hdr_begin + $32
story_hdr_standard_lo = story_hdr_begin + $33
story_hdr_alphabet_table_hi = story_hdr_begin + $34
story_hdr_alphabet_table_lo = story_hdr_begin + $35
;36 37 - z5 header extension table
.if ZVER = 3
OBJ_PARENT_OFS = 4
OBJ_SIBLING_OFS = 5
OBJ_CHILD_OFS = 6
OBJ_PROP_OFS = 7
OBJ_SIZE = 9
DEFAULT_PROPS_CNT = 31
DICT_WORD_LEN = 6
.else
OBJ_PARENT_OFS = 6
OBJ_SIBLING_OFS = 8
OBJ_CHILD_OFS = 10
OBJ_PROP_OFS = 12
OBJ_SIZE = 14
DEFAULT_PROPS_CNT = 63
DICT_WORD_LEN = 9
.endif
current_opcode_80 = $80
argument_count_81 = $81
arg1_lo_82 = $82
arg1_hi_83 = $83
arg2_lo_84 = $84
arg2_hi_85 = $85
arg3_lo_86 = $86
arg3_hi_87 = $87
arg4_lo_88 = $88
arg4_hi_89 = $89
.if ZVER >= 4
arg5_lo_8A = $8A
arg5_hi_8B = $8B
arg6_lo_8C = $8C
arg6_hi_8D = $8D
arg7_lo_8E = $8E
arg7_hi_8F = $8F
arg8_lo_90 = $90
arg8_hi_91 = $91
.endif
temp_lo_92 = $92
temp_hi_93 = $93
temp2_lo_94 = $94
temp2_hi_95 = $95
zcode_addr_lo_96 = $96
zcode_addr_hi_97 = $97
zcode_addr_hihi_98 = $98
zcode_buffer_valid_99 = $99
zcode_buffer_lo_9A = $9A
zcode_buffer_hi_9B = $9B
zdata_addr_lo_9C = $9C
zdata_addr_hi_9D = $9D
zdata_addr_hihi_9E = $9E
zdata_buffer_valid_9F = $9F
zdata_buffer_lo_A0 = $A0
zdata_buffer_hi_A1 = $A1
stack_pointer_lo_A2 = $A2
stack_pointer_hi_A3 = $A3 ;only used with LARGE_STACK
stack_pointer_function_frame_lo_A4 = $A4
stack_pointer_function_frame_hi_A5 = $A5 ;only used with LARGE_STACK
.if !EXTMEM
game_base_page_A6 = $A6 ;not used in EXTMEM
.endif
resident_mem_in_pages_A7 = $A7
.if !EXTMEM
after_dynamic_memory_page_A8 = $A8
.endif
cache_size_in_pages_A9 = $A9
get_sector_tmp_lo_AA = $AA
get_sector_tmp_hi_AB = $AB
ptr_globals_lo = $AC
ptr_globals_hi = $AD
ptr_dict_lo = $AE
ptr_dict_hi = $AF
ptr_abbrevs_lo = $B0
ptr_abbrevs_hi = $B1
ptr_objects_lo = $B2
ptr_objects_hi = $B3
;6 chars for Z3, 9 for Z4
converted_keyword_buffer_B4 = $B4
;b5, b6, b7, b8, b9 - z3
;ba, bb, bc - z4
;always free
;bd
local_vars_cnt1_BE = $BE
local_vars_cnt2_BF = $BF
curr_char_ptr_C0 = $C0
ptr_into_tokenized_buffer_C1 = $C1
chars_in_buffer_C2 = $C2
curr_kwd_buffer_idx_C3 = $C3
tmp_tokenized_buff_lo_C4 = $C4
tmp_tokenized_buff_hi_C5 = $C5
temp_vocab_count_lo_C6 = $C6
temp_vocab_count_hi_C7 = $C7
tmp_vocab_entry_len_C8 = $C8
charset_permanent_C9 = $C9
charset_temporary_CA = $CA
current_zchar_CB = $CB
tmp_abbrev_ptr_CC = $CC
zchars_already_output_CD = $CD
tmp_zchar_hi_CE = $CE
tmp_zchar_lo_CF = $CF
output_buffer_char_count_D0 = $D0
curr_char_ptr_in_D1 = $D1
curr_char_ptr_out_D2 = $D2
tmp_number_lo_D3 = $D3
tmp_number_hi_D4 = $D4
tmp_number_lo_D5 = $D5
tmp_number_hi_D6 = $D6
tmp_number_lo_D7 = $D7
tmp_number_hi_D8 = $D8
tmp_div_internal_lo_D9 = $D9
tmp_div_internal_hi_DA = $DA
number_of_significant_figures_DB = $DB
.if ZVER = 3
;Z3 only
status_type_DC = $DC
.endif
index_in_string_in_out_buffer_DD = $DD
byte_DE = $DE
transcripting_control_DF = $DF
lines_printed_since_last_pause_E0 = $E0
screen_lines_to_scroll_E1 = $E1
one_character_E2 = $E2
;e3
where_is_window_split_E4 = $E4
current_cache_idx_E5 = $e5
cache_age_correction_E6 = $e6
current_cache_age_E7 = $e7
available_cache_slot_idx_E8 = $e8
is_P_device_open_E9 = $E9
char_to_print_EA = $EA
sector_pointer_lo_EB = $EB
sector_pointer_hi_EC = $EC
read_buffer_lo_ED = $ED
read_buffer_hi_EE = $EE
disk_sect_lo_EF = $EF
disk_sect_hi_F0 = $F0
position_default_F1 = $F1
disk_drive_default_F2 = $F2
position_temp_F3 = $F3
disk_drive_temp_F4 = $F4
disk_drive_F5 = $F5
keydel_lo_f6 = $F6
keydel_hi_f7 = $F7
pmg_cursor_curr_shape_f8 = $F8
tmp_bitmap_F9 = $F9
temp_modded_lo_FA = $fa
temp_modded_hi_FB = $fb
;reserved for graphics drivers (not sure if used or not)
temp_gr1_lo = $fc
temp_gr1_hi = $fd
temp_gr2_lo = $fe
temp_gr2_hi = $ff
machine_stack = $100
tmp_disk_buffer = $400
;don't know how to make this correct in case of LARGE_STACK
;I was hoping to save the memory, but PMBASE must be on $800 multiples
;so $800+300 or $0+300 are the only options here
;or move it after large stack? or use player for this?
.if !LARGE_STACK
stack_word_lo = $500
stack_word_hi = $600
stack_start_page = >stack_word_lo
stack_pages = 2
.endif
start_of_cache_vars = $700
cached_sector_num_lo = start_of_cache_vars + 0
cached_sector_num_hi = start_of_cache_vars + $100
cache_age_table = start_of_cache_vars + $200
local_vars_lo = start_of_cache_vars + $300
local_vars_hi = start_of_cache_vars + $301
byte_A20 = start_of_cache_vars + $320
byte_A21 = start_of_cache_vars + $321
string_in_out_buffer = start_of_cache_vars + $380
pmg_missiles_mem = start_of_cache_vars + $400
pm_base = pmg_missiles_mem - $300
.if( (pm_base / $800 )*$800 != pm_base )
.error Incorrect pm_base
.endif
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; miniloader for DD disks
;
.if DD_ONE_SIDE && ! NAKED_INTERPRETER
org $b00
boot0_header: .BYTE 0
.BYTE 1
.WORD boot0_header
.WORD ldr_run
RTS
ldr_run: LDA #$52
STA DCOMND
LDA #1
STA DUNIT
;LDA #$31
;STA DDEVIC
LDA #4 ;from sector 4
STA DAUX1
LDA #0
STA DAUX2
LDA #0 ;$100 long sector
STA DBYTLO
LDA #1
STA DBYTHI
LDA #50
STA DTIMLO
LDA #<boot_header ;to boot .org
STA DBUFLO
LDA #>boot_header
STA DBUFHI
ldr_loop:
LDA #$40
STA DSTATS
JSR SIOV
BMI dsk_op_error_ldr
INC DAUX1
BNE not_over_s
INC DAUX2
not_over_s:
INC DBUFHI
DEC ldr_sectors
BNE ldr_loop
JSR boot_header+6
JMP (boot_header+4)
ldr_sectors: .BYTE [ ( end_of_boot - boot_header ) / $100 ]
ldr_err: .BYTE 'BOO BOO ERROR', atari_eol
ldr_err_len = * - ldr_err
dsk_op_error_ldr:
LDX #0
LDA #<ldr_err
STA ICBAL_0,X
LDA #>ldr_err
STA ICBAH_0,X
LDA #CIO_PRINT
STA ICCOM_0,X
LDA #$FF
STA ICBLL_0,X
JSR CIOV
ldr_halt: JMP ldr_halt
:[3*128-*+boot0_header] .BYTE 0
.endif
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; the main game boot header
;
;must be on even page?
org $c00-7
boot_header: .BYTE 0
.if( SD_TWO_SIDE || SD_ONE_SIDE || ED_ONE_SIDE )
.BYTE [ ( end_of_boot - boot_header ) / $80 ]
.elseif( DD_ONE_SIDE )
.BYTE [ ( end_of_boot - boot_header ) / $100 ]
.else
.error "Unknown disk format"
.endif
.WORD boot_header
.WORD init
RTS
.if CZ_LANG
font_addr:
ins "drv_a40_fnt1_capek.fnt"
.endif
.if EXTMEM
;here are defined two tables, each uses 'original' page as an index
;first translates page from 00-FF to banked page 40-7F
;second has precomputed portb values
;six lower bits of original page and hardcoded $40 bit to be in extmem window
pg_to_ext .macro pg
.BYTE [[:pg & %00111111 ] | %01000000]
.endm
;1 - ram / 0 - selftest
;1 - undefined
;1 - antic to std ram
;0 - cpu to extended
;xx - bank
;1 - basic off
;1 - os rom on
pg_to_portb .macro pg
.BYTE [[[:pg & %11000000]>>4 ] | %11100011]
.endm
extmem_map_pgs:
:$100 pg_to_ext(:1)
extmem_map_portbs:
:$100 pg_to_portb(:1)
.if [ * & 0xFF ]
.echo *
.error "unaligned!"
.endif
.endif
init:
LDA #<game_init
STA DOSINI_LO
STA DOSVEC_LO
LDA #>game_init
STA DOSINI_HI
STA DOSVEC_HI
.if NAKED_INTERPRETER
;I think we can safely hardcode it this way
;on reset, it
LDA $80
STA sector_patch1+1
LDA $81
STA sector_patch2+1
.if ZVER >= 5
LDA $82
STA interpreter_version_patch+1
.endif
.endif
LDA #$FF ;on XL/XE systems turns off basic
STA PORTB
JMP game_init
; ---------------------------------------------------------------------------
;this is actually the only place where such if/elseif should be
.if VIDEO = A40
icl "drv_a40.asm"
.elseif VIDEO = VBXE
icl "drv_vbxe.asm"
.elseif VIDEO = S80
icl "drv_s80.asm"
.elseif VIDEO = S64
icl "drv_s64.asm"
.else
.error "Invalid graphics driver selected (A40=1, VBXE=2, S80=3, S64=4 are the valid options)"
.endif
; ---------------------------------------------------------------------------
aStoryLoading: .BYTE 'The story is loading...', atari_eol
aStoryLoadingLen = * - aStoryLoading
; ---------------------------------------------------------------------------
game_init:
;48K ram test
LDA #0
STA $B000 ;sets $B000 to 0
LDA $B000
BNE not_enough_memory ;jumps if $B000 is nonzero (write protect, cart)
;second test just in case $B000 is 00 originally
DEC $B000 ;decrements $B000
LDA $B000 ;check if $B000 is still 0
BEQ not_enough_memory
.if EXTMEM
extmem_test:
LDA #$00 ;$4000 in main ram is 0
STA $4000
LDA #$E3
STA PORTB ;switch banks
STA $4000 ;$4000 in ext bank is $E3
LDA #$FF ;switch to main bank
STA PORTB
LDA $4000 ;on 130XE $4000 would be $0, on lower computers it would be $E3
CMP #$E3
BEQ not_enough_memory
.endif
.if VIDEO = VBXE
JSR vbxe_detect
BNE no_vbxe
.endif
JMP game_init_cont
.if VIDEO = VBXE
no_vbxe:
LDX #0
LDA #<novbxe_text
STA ICBAL_0,X
LDA #>novbxe_text
STA ICBAH_0,X
LDA #CIO_PRINT
STA ICCOM_0,X
LDA #$FF
STA ICBLL_0,X
JSR CIOV
JMP dynhalt
.endif
not_enough_memory:
LDX #0
LDA #<lowmem_err
STA ICBAL_0,X
LDA #>lowmem_err
STA ICBAH_0,X
LDA #CIO_PRINT
STA ICCOM_0,X
LDA #$FF
STA ICBLL_0,X
JSR CIOV
dynhalt: JMP dynhalt
.if !EXTMEM
lowmem_err: .BYTE 'This game needs at least 48KB of RAM', atari_eol
.else
lowmem_err: .BYTE 'This game needs at least 130KB of RAM', atari_eol
.endif
.if VIDEO = VBXE
novbxe_text: .byte 'No VBXE found or unsupported core', atari_eol
.endif
;-----------------------------------------------------------------------------
game_init_cont:
CLD
LDX #$FF
TXS
;is this actually needed for anything?
LDA #>end_of_48k_ram_page
STA RAMTOP
STA RAMSIZ
;should call only the respective init for selected driver
JSR graphics_init
LDX #$FF
STX CH
STX PORTB
;$00
INX