mirror of
https://github.com/a2-4am/pitch-dark.git
synced 2024-09-26 12:55:08 +00:00
870 lines
17 KiB
ArmAsm
870 lines
17 KiB
ArmAsm
;license:MIT
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;(c) 2018 by qkumba
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!cpu 6502
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!to "build/zinfo5u",plain
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*=$3000
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save_name = $2006
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read_buffer = $2e00 ;512 bytes
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info_buffer = $2000 ;record_size*8, 600 ($258) bytes
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zpage_info = $fe ;word
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zpage_ptr = $fd
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zpage_gamind = $fc
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name_offset = 0 ;1+37 bytes, a zero-length name is an empty record
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time_offset = 42 ;1+8 bytes ("12:01 pm")
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score_offset = 51 ;1+6 bytes (-12345)
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moves_offset = 58 ;1+5 bytes (12345)
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date_offset = 64 ;1+10 bytes ("10/10/2099")
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record_size = 75 ;bytes
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;zpage used by Infocom code
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zp_58 = $58
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zp_59 = $59
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zp_5A = $5a
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zp_5B = $5b
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zp_6B = $6b
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zp_6C = $6c
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zp_6D = $6d
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zp_6E = $6e
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zp_7B = $7b
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zp_7C = $7c
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zp_7D = $7d
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zp_7E = $7e
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zp_7F = $7f
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zp_80 = $80
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zp_83 = $83
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zp_84 = $84
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zp_87 = $87
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zp_88 = $88
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zp_89 = $89
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zp_8A = $8a
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zp_A0 = $a0
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zp_A1 = $a1
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zp_A8 = $a8
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zp_A9 = $a9
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zp_AA = $aa
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zp_AB = $ab
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zp_AC = $ac
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zp_AD = $ad
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zp_AE = $ae
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zp_CC = $cc
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zp_CD = $cd
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zp_CE = $ce
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zp_CF = $cf
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zp_D0 = $d0
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zp_D1 = $d1
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zp_D2 = $d2
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zp_D3 = $d3
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zp_D4 = $d4
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jsr exchange
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jsr $bf00
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!byte $c8 ;open file
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!word c8_parms
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lda c8_handle
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sta ce_handle
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sta ca_handle
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lda #>info_buffer
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sta zpage_info+1
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lda #<info_buffer
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sta zpage_info
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zero_info
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ldy #name_offset
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sty zpage_ptr
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tya
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sta (zpage_info),y
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clc
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lda zpage_info
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adc #record_size
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sta zpage_info
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bcc +
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inc zpage_info+1
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+ inc index+1
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index
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lda #0
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cmp #8
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bcc zero_info
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lda #0
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sta zpage_gamind
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lda #<gamelist
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sta zpage_info
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lda #>gamelist
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sta zpage_info+1
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--- ldy #0
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lda (zpage_info),y
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beq close
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+ pha
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cmp $2006
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beq +
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-- inc zpage_gamind
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pla
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sec
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adc zpage_info
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sta zpage_info
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bcc ---
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inc zpage_info+1
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bne ---
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+ tay
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- lda $2006,y
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cmp (zpage_info),y
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bne --
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dey
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bne -
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pla
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lda #>info_buffer
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sta zpage_info+1
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lda #<info_buffer
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sta zpage_info
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;position to file offset
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fetch_info
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lda #0
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sta ce_offset+2
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position
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ldx #0
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beq ++
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- clc
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adc #$b8
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bcc +
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inc ce_offset+2
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+ dex
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bne -
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++ clc
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adc #5
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sta ce_offset+1
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sta ce_base1+1
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bcc +
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inc ce_offset+2
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+ lda ce_offset+2
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sta ce_base2+1
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jsr seekread
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bcs nextpos
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ldy #name_offset
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sty zpage_ptr
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jsr dump_info
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nextpos
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clc
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lda zpage_info
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adc #record_size
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sta zpage_info
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bcc +
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inc zpage_info+1
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+ inc position+1
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lda position+1
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cmp #3
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bcc fetch_info
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close
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jsr $bf00
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!byte $cc ;close file
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!word cc_parms
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quit
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lda $bf30
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sta c5_parms+1
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jsr $bf00
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!byte $c5
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!word c5_parms
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lda $201
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and #$0f
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tax
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inx
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stx $200
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lda #$2f
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sta $201
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jsr $bf00
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!byte $c6
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!word c6_parms
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exchange
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ldx #(zp_D4-zp_58)
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- ldy zpage_old-1,x
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lda zp_58-1,x
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sty zp_58-1,x
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sta zpage_old-1,x
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dex
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bne -
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rts
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load_page
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ldx zp_80
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cpx zp_A1
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bne +
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cmp zp_A0
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beq seek_ret
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+ stx zp_A1
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sta zp_A0
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clc
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ce_base1
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adc #0
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sta ce_offset+1
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txa
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ce_base2
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adc #0
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sta ce_offset+2
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seekread
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jsr $bf00
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!byte $ce ;seek
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!word ce_parms
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bcs seek_ret
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jsr $bf00
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!byte $ca ;read file
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!word ca_parms
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seek_ret
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rts
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c8_parms
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!byte 3
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!word save_name
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!word $1C00
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c8_handle
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!byte 0
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ce_parms
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!byte 2
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ce_handle
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!byte 0
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ce_offset
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!byte 0,0,0
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ca_parms
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!byte 4
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ca_handle
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!byte 0
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ca_offset
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!word read_buffer
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ca_size
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!word $200
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!word $ffff
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cc_parms
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c6_parms
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!byte 1
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!byte 0
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c5_parms
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!byte 2
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!byte 0
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!word $201
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!byte $d1
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dump_info
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tsx
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stx stack_pointer+1
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;set up pointers for decompression and "score" display
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lda #0
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sta zp_7E
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sta zp_80
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sta zp_A0
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sta zp_A1
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lda read_buffer+$0d
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sta zp_83
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lda read_buffer+$0c
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sta zp_84
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lda read_buffer+$19
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sta zp_87
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lda read_buffer+$18
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sta zp_88
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lda read_buffer+$0b
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sta zp_89
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lda read_buffer+$0a
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sta zp_8A
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;dump info, actual Infocom code in upper-case
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lda #42
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sta max_chars
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ldx zpage_gamind
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lda gameloc, x
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JSR fetch_obj
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lda zp_6B
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ora zp_6C
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bne +
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rts
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+ LDA zp_6B
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LDX zp_6C
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JSR decompress
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lda zpage_ptr
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ldy #name_offset
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sta (zpage_info),y
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ldy #time_offset
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sty zpage_ptr
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lda #0
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sta max_chars ;can't overflow anymore
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sta (zpage_info),y
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ldy #score_offset
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sty zpage_ptr
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lda #0
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sta (zpage_info),y
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ldy #moves_offset
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sty zpage_ptr
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lda #0
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sta (zpage_info),y
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ldx zpage_gamind
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lda gamemoves, x
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beq skip_moves
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jsr fetch_obj
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lda zp_6B
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sta zp_58
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lda zp_6C
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sta zp_59
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jsr loc_E9E4
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sec
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lda zpage_ptr
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sbc #moves_offset
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ldy #moves_offset
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sta (zpage_info),y
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skip_moves
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ldy #date_offset
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sty zpage_ptr
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lda #0
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sta (zpage_info),y
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rts
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!source "src/zinfo/z5u/gamedata.txt"
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fetch_obj:
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JSR sub_E1B1
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lda zp_6E
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pha
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jsr load_page
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lda #>read_buffer
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sta zp_6E
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LDA (zp_6D),Y
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STA zp_6C
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INY
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LDA (zp_6D),Y
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STA zp_6B
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pla
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sta zp_6E
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RTS
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sub_E1B1:
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SEC
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SBC #$10
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LDY #0
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STY zp_6E
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ASL
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ROL zp_6E
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CLC
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ADC zp_83
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STA zp_6D
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LDA zp_6E
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ADC zp_84
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STA zp_6E
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locret_E1C6:
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RTS
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decompress
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JSR sub_F538
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LDY #$C
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jsr load_page
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lda #>read_buffer
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sta zp_6E
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LDA (zp_6D),Y
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TAX
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INY
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LDA (zp_6D),Y
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STA zp_6D
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STX zp_6E
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INC zp_6D
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BNE loc_E49C
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INC zp_6E
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loc_E49C:
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JSR sub_F081
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JMP sub_F307
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sub_E7BD:
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JSR sub_E7C7
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LDX zp_CE
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LDA zp_CF
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rts
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sub_E7C7:
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LDA zp_59
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STA zp_D3
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EOR zp_5B
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STA zp_D2
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LDA zp_58
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STA zp_CC
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LDA zp_59
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STA zp_CD
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BPL loc_E7DC
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JSR sub_E805
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loc_E7DC:
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LDA zp_5A
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STA zp_CE
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LDA zp_5B
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STA zp_CF
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BPL loc_E7E9
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JSR sub_E7F7
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loc_E7E9:
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JSR sub_E813
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LDA zp_D2
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BPL loc_E7F3
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JSR sub_E805
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loc_E7F3:
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LDA zp_D3
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BPL locret_E804
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sub_E7F7:
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LDA #0
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SEC
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SBC zp_CE
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STA zp_CE
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LDA #0
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SBC zp_CF
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STA zp_CF
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locret_E804:
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RTS
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sub_E805:
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LDA #0
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SEC
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SBC zp_CC
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STA zp_CC
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LDA #0
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SBC zp_CD
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STA zp_CD
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RTS
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sub_E813:
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JSR sub_E849
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loc_E81C:
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ROL zp_CC
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ROL zp_CD
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ROL zp_D0
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ROL zp_D1
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LDA zp_D0
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SEC
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SBC zp_CE
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TAY
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LDA zp_D1
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SBC zp_CF
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BCC loc_E834
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STY zp_D0
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STA zp_D1
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loc_E834:
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DEX
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BNE loc_E81C
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ROL zp_CC
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ROL zp_CD
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LDA zp_D0
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STA zp_CE
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LDA zp_D1
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STA zp_CF
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RTS
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sub_E849:
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LDX #$10
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LDA #0
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STA zp_D0
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STA zp_D1
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CLC
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RTS
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loc_E9E4:
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LDA zp_58
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STA zp_CC
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LDA zp_59
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STA zp_CD
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LDA zp_CD
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BPL loc_E9F8
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LDA #$2D
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JSR emit_char
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JSR sub_E805
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loc_E9F8:
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LDA #0
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STA zp_D4
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loc_E9FC:
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LDA zp_CC
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ORA zp_CD
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BEQ loc_EA14
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LDA #$A
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STA zp_CE
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LDA #0
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STA zp_CF
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JSR sub_E813
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LDA zp_CE
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PHA
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INC zp_D4
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BNE loc_E9FC
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loc_EA14:
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LDA zp_D4
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BNE loc_EA1D
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LDA #$30
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JMP emit_char
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loc_EA1D:
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PLA
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CLC
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ADC #$30
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JSR emit_char
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DEC zp_D4
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BNE loc_EA1D
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RTS
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sub_F081:
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LDA zp_6D
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STA zp_7B
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LDA zp_6E
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STA zp_7C
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LDA #0
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STA zp_7D
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JMP sub_F109
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sub_F109:
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ldy zp_7D
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LDA zp_7C
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STY zp_80
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STA zp_7F
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RTS
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sub_F2AC:
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PHA
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INC zp_7C
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BNE loc_F2B3
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INC zp_7D
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loc_F2B3:
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JSR sub_F109
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PLA
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RTS
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sub_F2C4:
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LDY zp_7B
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lda zp_7F
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pha
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jsr load_page
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lda #>read_buffer
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sta zp_7F
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LDA (zp_7E),Y
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INC zp_7B
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BNE loc_F2D7
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JSR sub_F2AC
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loc_F2D7:
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TAY
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pla
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sta zp_7F
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tya
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RTS
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sub_F2EE:
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LDA zp_6D
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ASL
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STA zp_7B
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LDA zp_6E
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ROL
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STA zp_7C
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LDA #0
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ROL
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STA zp_7D
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ASL zp_7B
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ROL zp_7C
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ROL zp_7D
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JMP sub_F109
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locret_F306:
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RTS
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sub_F307:
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LDX #0
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STX zp_A8
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STX zp_AC
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DEX
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STX zp_A9
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loc_F310:
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JSR sub_F3ED
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BCS locret_F306
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STA zp_AA
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TAX
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BEQ loc_F35B
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CMP #4
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BCC loc_F379
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CMP #6
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BCC loc_F35F
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JSR sub_F3CF
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TAX
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BNE loc_F333
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LDA #$5B
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loc_F32A:
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CLC
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ADC zp_AA
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loc_F32D:
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JSR emit_char
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JMP loc_F310
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loc_F333:
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CMP #1
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BNE loc_F33B
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LDA #$3B
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BNE loc_F32A
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loc_F33B:
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LDA zp_AA
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SEC
|
|
SBC #6
|
|
BEQ loc_F349
|
|
TAX
|
|
LDA byte_F51E,X
|
|
JMP loc_F32D
|
|
|
|
loc_F349:
|
|
JSR sub_F3ED
|
|
ASL
|
|
ASL
|
|
ASL
|
|
ASL
|
|
ASL
|
|
STA zp_AA
|
|
JSR sub_F3ED
|
|
ORA zp_AA
|
|
JMP loc_F32D
|
|
|
|
loc_F35B:
|
|
LDA #$20
|
|
BNE loc_F32D
|
|
|
|
loc_F35F:
|
|
SEC
|
|
SBC #3
|
|
TAY
|
|
JSR sub_F3CF
|
|
BNE loc_F36D
|
|
STY zp_A9
|
|
JMP loc_F310
|
|
|
|
loc_F36D:
|
|
STY zp_A8
|
|
CMP zp_A8
|
|
BEQ loc_F310
|
|
LDA #0
|
|
STA zp_A8
|
|
BEQ loc_F310
|
|
|
|
loc_F379:
|
|
SEC
|
|
SBC #1
|
|
ASL
|
|
ASL
|
|
ASL
|
|
ASL
|
|
ASL
|
|
ASL
|
|
STA zp_AB
|
|
JSR sub_F3ED
|
|
ASL
|
|
CLC
|
|
ADC zp_AB
|
|
TAY
|
|
lda zp_88
|
|
pha
|
|
jsr load_page
|
|
lda #>read_buffer
|
|
sta zp_88
|
|
LDA (zp_87),Y
|
|
STA zp_6E
|
|
INY
|
|
LDA (zp_87),Y
|
|
STA zp_6D
|
|
pla
|
|
sta zp_88
|
|
LDA zp_7D
|
|
PHA
|
|
LDA zp_7C
|
|
PHA
|
|
LDA zp_7B
|
|
PHA
|
|
LDA zp_A9
|
|
PHA
|
|
LDA zp_AC
|
|
PHA
|
|
LDA zp_AE
|
|
PHA
|
|
LDA zp_AD
|
|
PHA
|
|
JSR sub_F3DB
|
|
JSR sub_F307
|
|
PLA
|
|
STA zp_AD
|
|
PLA
|
|
STA zp_AE
|
|
PLA
|
|
STA zp_AC
|
|
PLA
|
|
STA zp_A8
|
|
PLA
|
|
STA zp_7B
|
|
PLA
|
|
STA zp_7C
|
|
PLA
|
|
STA zp_7D
|
|
LDX #$FF
|
|
STX zp_A9
|
|
JSR sub_F109
|
|
JMP loc_F310
|
|
|
|
sub_F3CF:
|
|
LDA zp_A9
|
|
BPL loc_F3D6
|
|
LDA zp_A8
|
|
RTS
|
|
|
|
loc_F3D6:
|
|
LDY #$FF
|
|
STY zp_A9
|
|
RTS
|
|
|
|
sub_F3DB:
|
|
LDA zp_6D
|
|
ASL
|
|
STA zp_7B
|
|
LDA zp_6E
|
|
ROL
|
|
STA zp_7C
|
|
LDA #0
|
|
ROL
|
|
STA zp_7D
|
|
JMP sub_F109
|
|
|
|
sub_F3ED:
|
|
LDA zp_AC
|
|
BPL loc_F3F3
|
|
SEC
|
|
RTS
|
|
|
|
loc_F3F3:
|
|
BNE loc_F408
|
|
INC zp_AC
|
|
JSR sub_F2C4
|
|
STA zp_AE
|
|
JSR sub_F2C4
|
|
STA zp_AD
|
|
LDA zp_AE
|
|
LSR
|
|
LSR
|
|
JMP loc_F431
|
|
|
|
loc_F408:
|
|
SEC
|
|
SBC #1
|
|
BNE loc_F423
|
|
LDA #2
|
|
STA zp_AC
|
|
LDA zp_AD
|
|
STA zp_6D
|
|
LDA zp_AE
|
|
ASL zp_6D
|
|
ROL
|
|
ASL zp_6D
|
|
ROL
|
|
ASL zp_6D
|
|
ROL
|
|
JMP loc_F431
|
|
|
|
loc_F423:
|
|
LDA #0
|
|
STA zp_AC
|
|
LDA zp_AE
|
|
BPL loc_F42F
|
|
LDA #$FF
|
|
STA zp_AC
|
|
|
|
loc_F42F:
|
|
LDA zp_AD
|
|
|
|
loc_F431:
|
|
AND #$1F
|
|
CLC
|
|
RTS
|
|
|
|
byte_F51E:
|
|
!BYTE 0, $D, '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '.', ',', '!', '?', '_'
|
|
!BYTE '#', $27, '"', '/', $5C, '-', ':', '(', ')'
|
|
|
|
sub_F538:
|
|
STX zp_6E
|
|
ASL
|
|
STA zp_6D
|
|
ROL zp_6E
|
|
LDX zp_6E
|
|
ASL
|
|
ROL zp_6E
|
|
ASL
|
|
ROL zp_6E
|
|
ASL
|
|
ROL zp_6E
|
|
SEC
|
|
SBC zp_6D
|
|
STA zp_6D
|
|
LDA zp_6E
|
|
STX zp_6E
|
|
SBC zp_6E
|
|
STA zp_6E
|
|
LDA zp_6D
|
|
CLC
|
|
ADC #$70
|
|
BCC loc_F5B5
|
|
INC zp_6E
|
|
|
|
loc_F5B5:
|
|
CLC
|
|
ADC zp_89
|
|
STA zp_6D
|
|
LDA zp_6E
|
|
ADC zp_8A
|
|
STA zp_6E
|
|
RTS
|
|
|
|
emit_char
|
|
sty yreg+1
|
|
inc zpage_ptr
|
|
ldy zpage_ptr
|
|
sta (zpage_info),y
|
|
dec max_chars
|
|
beq fail_slot
|
|
yreg
|
|
ldy #0
|
|
rts
|
|
|
|
fail_slot
|
|
stack_pointer
|
|
ldx #0
|
|
txs
|
|
rts
|
|
|
|
max_chars !byte 0
|
|
|
|
zpage_old
|