mirror of
https://github.com/a2-4am/passport.git
synced 2024-06-08 16:29:33 +00:00
94 lines
2.4 KiB
Plaintext
94 lines
2.4 KiB
Plaintext
;-------------------------------
|
|
; IDLaureate
|
|
; identify custom bootloader seen on disks from
|
|
; Laureate Learning Systems
|
|
; loads RWTS directly into language card
|
|
;
|
|
; in: track buffer contains T00,S00
|
|
; out: C clear if Laureate bootloader was found
|
|
; (and track buffer now contains all of track 0)
|
|
; C set if not found
|
|
; all other flags clobbered
|
|
; all registers clobbered
|
|
;-------------------------------
|
|
!zone {
|
|
IDLaureate
|
|
lda #$00
|
|
ldx #$2E
|
|
ldy #$0E
|
|
jsr compare ; if T00,S00,$2E ==
|
|
!byte $AE,$FF,$08; LDX $08FF
|
|
!byte $30,$1E ; BMI +$1E
|
|
!byte $E0,$02 ; CPX #$02
|
|
!byte $D0,$05 ; BNE +$05
|
|
!byte $A9,$BF ; LDA #$BF
|
|
!byte $8D,$FE,$08; STA $08FE
|
|
bcs .exit
|
|
lda #$00
|
|
ldx #$F8
|
|
ldy #$08
|
|
jsr compare ; and T00,S00,$F8 ==
|
|
!byte $4C,$00,$B7; JMP $B700
|
|
!byte $00,$00,$00
|
|
!byte $FF,$0B
|
|
.exit
|
|
rts
|
|
}
|
|
|
|
;-------------------------------
|
|
; TraceLaureate
|
|
; Create an RWTS that can read the disk (T01+).
|
|
; The original RWTS lives at $F800, which is
|
|
; inconvenient. So, starting with our built-in RWTS,
|
|
; we copy bits and pieces to create a similar RWTS
|
|
; that lives at $B800.
|
|
;;
|
|
; in: track buffer contains all of track 0
|
|
; exits via ADStyle
|
|
;-------------------------------
|
|
!zone {
|
|
TraceLaureate
|
|
lda #$00
|
|
sta modsrc
|
|
lda #$04
|
|
clc
|
|
adc #BASEPAGE
|
|
sta modsrc+1
|
|
ldy #$E7
|
|
lda (modsrc),y
|
|
sta UNIV_D1
|
|
ldy #$F1
|
|
lda (modsrc),y
|
|
sta UNIV_D2
|
|
ldy #$FC
|
|
lda (modsrc),y
|
|
sta UNIV_D3
|
|
inc modsrc+1
|
|
ldy #$44
|
|
- lda (modsrc),y
|
|
sta $b900,y
|
|
iny
|
|
cpy #$A0
|
|
bne -
|
|
inc modsrc+1
|
|
ldy #$29
|
|
- lda (modsrc),y
|
|
sta $BA00,y
|
|
iny
|
|
bne -
|
|
;
|
|
; don't read track 0 sectors $0C-$0F
|
|
; (never read, some disks have intentionally bad sectors there)
|
|
; (seen on Sound Ideas)
|
|
;
|
|
lda #$00
|
|
sta T00S0C
|
|
sta T00S0D
|
|
sta T00S0E
|
|
sta T00S0F
|
|
;
|
|
; read the rest of the disk with this constructed RWTS
|
|
;
|
|
jmp ADStyle
|
|
}
|