195 lines
3.1 KiB
ArmAsm
195 lines
3.1 KiB
ArmAsm
; Loader for sb
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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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sta NOT_FIRST_TIME
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lda #1
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sta CURRENT_DISK ; current disk number
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forever_loop:
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jsr load_file
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load_entry_smc:
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jsr $6000 ; jump to loaded file
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jmp forever_loop
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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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sta load_entry_smc+2
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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 ; TITLE, DUCK, ROOF, ASPLODE
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.byte 1,1,1,1 ; TARGET, CLIFF, RAT, BACK_OFF
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load_address_array:
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.byte $60,$60,$60,$40 ; TITLE, DUCK, ROOF, ASPLODE
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.byte $60,$60,$60,$60 ; TARGET, CLIFF, RAT, BACK_OFF
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track_array:
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.byte 2, 5,10,15 ; TITLE, DUCK, ROOF, ASPLODE
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.byte 20,25,30,32 ; TARGET, CLIFF, RAT, BACK_OFF
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sector_array:
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.byte 0, 0, 0, 0 ; TITLE, DUCK, ROOF, ASPLODE
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.byte 0, 0, 0, 0 ; TARGET, CLIFF, RAT, BACK_OFF
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length_array:
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.byte 40, 16, 16, 70 ; TITLE, DUCK, ROOF, ASPLODE
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.byte 32, 32, 32, 24 ; TARGET, CLIFF, RAT, BACK_OFF
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qload_end:
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.assert (>qload_end - >qload_start) < $e , error, "loader too big"
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