Writing to flash
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Writing to flash
United-TI Archives -> Z80 & 68k Assembly
 
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luby
I want to go back to Philmont!!


Calc Guru


Joined: 23 Apr 2006
Posts: 1477
Posted: 12 Apr 2009 02:37:28 pm    Post subject:
Unlock Flash:

Code:

;Unlocks Flash protection.
;Destroys: appBackUpScreen
;          pagedCount
;          pagedGetPtr
;          arcInfo
;          iMathPtr5
;          pagedBuf
;          ramCode
        in a,(6)
        push af
        ld a,7Bh
        call translatePage
        out (6),a
        ld hl,5092h
        ld e,(hl)
        inc hl
        ld d,(hl)
        inc hl
        ld a,(hl)
        call translatePage
        out (6),a
        ex de,hl
        ld a,0CCh
        ld bc,0FFFFh
        cpir
        ld e,(hl)
        inc hl
        ld d,(hl)
        push de
        pop ix
        ld hl,9898h
        ld (hl),0C3h
        inc hl
        ld (hl),returnPoint & 11111111b
        inc hl
        ld (hl),returnPoint >> 8
        ld hl,pagedBuf
        ld (hl),98h
        ld de,pagedBuf+1
        ld bc,49
        ldir
        ld (iMathPtr5),sp
        ld hl,(iMathPtr5)
        ld de,9A00h
        ld bc,50
        ldir   
        ld de,(iMathPtr5)
        ld hl,-12
        add hl,de
        ld (iMathPtr5),hl
        ld iy,0056h-25h
        ld a,50
        ld (pagedCount),a
        ld a,8
        ld (arcInfo),a
        jp (ix)
translatePage:
        ld b,a
        in a,(2)
        and 80h
        jr z,_is83P
        in a,(21h)
        and 3
        ld a,b
        ret nz
        and 3Fh
        ret
_is83P: ld a,b
        and 1Fh
        ret
returnPoint:
        ld iy,flags
        ld hl,(iMathPtr5)
        ld de,12
        add hl,de
        ld sp,hl
        ex de,hl
        ld hl,9A00h
        ld bc,50
        ldir
        pop af
        out (6),a
        ret
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Mapar007


Advanced Member


Joined: 04 Oct 2008
Posts: 365
Posted: 14 Apr 2009 02:08:45 am    Post subject:
I think I tried that one...
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Writing to flash
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