mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-11-17 14:12:58 +00:00
203 lines
3.4 KiB
ArmAsm
203 lines
3.4 KiB
ArmAsm
; Loader for MIST
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.include "zp.inc"
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.include "hardware.inc"
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;.include "common_defines.inc"
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.include "qboot.inc"
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qload_start:
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; init the write code
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; lda WHICH_SLOT
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; jsr popwr_init
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; first time entry
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; start by loading text title
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lda #0 ; load LEMM engine
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sta WHICH_LOAD
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lda #1
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sta CURRENT_DISK ; current disk number
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jsr load_file
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jmp $6000 ; jump to LEMM
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;====================================
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; loads file specified by WHICH_LOAD
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;====================================
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load_file:
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ldx WHICH_LOAD
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lda which_disk_array,X
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cmp CURRENT_DISK
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bne change_disk
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load_file_no_diskcheck:
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lda load_address_array,X
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sta load_address
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lda track_array,X
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sta load_track
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lda sector_array,X
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sta load_sector
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lda length_array,X
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sta load_length
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jsr load_new
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rts
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;===================================================
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;===================================================
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; change disk
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;===================================================
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;===================================================
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change_disk:
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.if 0
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; turn off disk drive light
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jsr driveoff
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jsr TEXT
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jsr HOME
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lda #<error_string
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sta OUTL
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lda #>error_string
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sta OUTH
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ldx WHICH_LOAD
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lda which_disk_array,X
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clc
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adc #48
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ldy #19
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sta (OUTL),Y
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ldy #0
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quick_print:
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lda (OUTL),Y
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beq quick_print_done
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jsr COUT1
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iny
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jmp quick_print
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quick_print_done:
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fnf_keypress:
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lda KEYPRESS
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bpl fnf_keypress
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bit KEYRESET
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;==============================================
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; actually verify proper disk is there
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; read T0:S0 and verify proper disk
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lda WHICH_LOAD
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pha
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ldx #LOAD_FIRST_SECTOR ; load track 0 sector 0
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stx WHICH_LOAD
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jsr load_file_no_diskcheck
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pla
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sta WHICH_LOAD
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tax
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; first sector now in $c00
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; offset 59
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; disk1 = $0a
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; disk2 = $32 ('2')
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; disk3 = $33 ('3')
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lda $c59
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cmp #$0a
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beq is_disk1
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cmp #$32
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beq is_disk2
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cmp #$33
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beq is_disk3
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bne change_disk ; unknown disk
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is_disk1:
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lda #1
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bne disk_compare
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is_disk2:
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lda #2
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bne disk_compare
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is_disk3:
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lda #3
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disk_compare:
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cmp which_disk_array,X
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bne change_disk ; disk mismatch
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;==============================================
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; all good, retry original load
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jsr HOME
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ldx WHICH_LOAD
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lda which_disk_array,X
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sta CURRENT_DISK
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jmp load_file
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; offset for disk number is 19
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error_string:
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.byte "PLEASE INSERT DISK 1, PRESS RETURN",0
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.endif
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which_disk_array:
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.byte 1,1,1,1 ; LEMM, LEVEL1, LEVEL2, LEVEL3
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.byte 1,1,1,1 ; LEVEL4, LEVEL5, LEVEL6, LEVEL7
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.byte 1,1,1,1 ;
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load_address_array:
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.byte $60,$90,$90,$90 ; LEMM, LEVEL1, LEVEL2, LEVEL3
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.byte $90,$90,$90,$90 ; LEVEL4, LEVEL5, LEVEL6, LEVEL7
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.byte $90,$90,$90,$90 ;
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track_array:
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.byte 3,10,13,16 ; LEMM, LEVEL1, LEVEL2, LEVEL3
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.byte 19,22,25,28 ; LEVEL4, LEVEL5, LEVEL6, LEVEL7
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.byte 31,31,31,31 ;
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sector_array:
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.byte 0, 0, 0, 0 ; LEMM, LEVEL1, LEVEL2, LEVEL3
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.byte 0, 0, 0, 0 ; LEVEL4, LEVEL5, LEVEL6, LEVEL7
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.byte 0, 0, 0, 0 ;
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length_array:
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.byte 48, 46, 46, 46 ; LEMM, LEVEL1, LEVEL2, LEVEL3
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.byte 46, 46, 46, 46 ; LEVEL4, LEVEL5, LEVEL6, LEVEL7
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.byte 32, 32, 32, 32 ;
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.include "wait.s"
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.include "wait_a_bit.s"
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.include "audio.s"
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.include "decompress_fast_v2.s"
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.include "gr_offsets.s"
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.include "hgr_hlin.s"
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.include "hgr_vlin.s"
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.include "hgr_box.s"
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.include "hgr_tables.s"
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.include "hgr_partial_restore.s"
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.include "hgr_14x14_sprite.s"
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qload_end:
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.assert (>qload_end - >qload_start) < $e , error, "loader too big"
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