dos33fsprogs/games/sb/qload.s
2023-06-16 02:00:04 -04:00

195 lines
3.1 KiB
ArmAsm

; Loader for sb
.include "zp.inc"
.include "hardware.inc"
;.include "common_defines.inc"
.include "qboot.inc"
qload_start:
; init the write code
; lda WHICH_SLOT
; jsr popwr_init
; first time entry
; start by loading text title
lda #0 ; load LEMM engine
sta WHICH_LOAD
sta NOT_FIRST_TIME
lda #1
sta CURRENT_DISK ; current disk number
forever_loop:
jsr load_file
load_entry_smc:
jsr $6000 ; jump to loaded file
jmp forever_loop
;====================================
; loads file specified by WHICH_LOAD
;====================================
load_file:
ldx WHICH_LOAD
lda which_disk_array,X
cmp CURRENT_DISK
bne change_disk
load_file_no_diskcheck:
lda load_address_array,X
sta load_address
sta load_entry_smc+2
lda track_array,X
sta load_track
lda sector_array,X
sta load_sector
lda length_array,X
sta load_length
jsr load_new
rts
;===================================================
;===================================================
; change disk
;===================================================
;===================================================
change_disk:
.if 0
; turn off disk drive light
jsr driveoff
jsr TEXT
jsr HOME
lda #<error_string
sta OUTL
lda #>error_string
sta OUTH
ldx WHICH_LOAD
lda which_disk_array,X
clc
adc #48
ldy #19
sta (OUTL),Y
ldy #0
quick_print:
lda (OUTL),Y
beq quick_print_done
jsr COUT1
iny
jmp quick_print
quick_print_done:
fnf_keypress:
lda KEYPRESS
bpl fnf_keypress
bit KEYRESET
;==============================================
; actually verify proper disk is there
; read T0:S0 and verify proper disk
lda WHICH_LOAD
pha
ldx #LOAD_FIRST_SECTOR ; load track 0 sector 0
stx WHICH_LOAD
jsr load_file_no_diskcheck
pla
sta WHICH_LOAD
tax
; first sector now in $c00
; offset 59
; disk1 = $0a
; disk2 = $32 ('2')
; disk3 = $33 ('3')
lda $c59
cmp #$0a
beq is_disk1
cmp #$32
beq is_disk2
cmp #$33
beq is_disk3
bne change_disk ; unknown disk
is_disk1:
lda #1
bne disk_compare
is_disk2:
lda #2
bne disk_compare
is_disk3:
lda #3
disk_compare:
cmp which_disk_array,X
bne change_disk ; disk mismatch
;==============================================
; all good, retry original load
jsr HOME
ldx WHICH_LOAD
lda which_disk_array,X
sta CURRENT_DISK
jmp load_file
; offset for disk number is 19
error_string:
.byte "PLEASE INSERT DISK 1, PRESS RETURN",0
.endif
which_disk_array:
.byte 1,1,1,1 ; TITLE, DUCK, ROOF, ASPLODE
.byte 1,1,1,1 ; TARGET, CLIFF, RAT, BACK_OFF
load_address_array:
.byte $60,$60,$60,$40 ; TITLE, DUCK, ROOF, ASPLODE
.byte $60,$60,$60,$60 ; TARGET, CLIFF, RAT, BACK_OFF
track_array:
.byte 2, 5,10,15 ; TITLE, DUCK, ROOF, ASPLODE
.byte 20,25,30,32 ; TARGET, CLIFF, RAT, BACK_OFF
sector_array:
.byte 0, 0, 0, 0 ; TITLE, DUCK, ROOF, ASPLODE
.byte 0, 0, 0, 0 ; TARGET, CLIFF, RAT, BACK_OFF
length_array:
.byte 40, 16, 16, 70 ; TITLE, DUCK, ROOF, ASPLODE
.byte 32, 32, 32, 24 ; TARGET, CLIFF, RAT, BACK_OFF
qload_end:
.assert (>qload_end - >qload_start) < $e , error, "loader too big"