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Back to the Future Part II (Amstrad CPC)
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Cleanup > Pages missing date references
Cleanup > Pages missing developer references
Cleanup > Pages missing publisher references
Games > Games by content > Games with hidden level selects
Games > Games by content > Games with uncompiled source code
Games > Games by content > Games with unused text
Games > Games by developer > Games developed by Throwback Entertainment > Games developed by Acclaim Entertainment > Games developed by Acclaim Studios Cheltenham > Games developed by Acclaim Studios London > Games developed by Probe Entertainment > Games developed by Probe Software
Games > Games by platform > Amstrad CPC games
Games > Games by publisher > Games published by Throwback Entertainment > Games published by Acclaim Entertainment > Games published by Arena Entertainment > Games published by Mirrorsoft > Games published by Image Works
Games > Games by release date > Games released in 1989
Games > Games by series > Back to the Future series
Back to the Future Part II |
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Developer: Probe Software This game has uncompiled source code. |
Cheat Mode
Type headbutt during the scrolling credits and wait until the credits begin to roll for the second time. You should see "HILLBERT" replaced with "HEADBUTT", followed by a message confirming correct code entry. You can now skip levels by pressing ESC.
Unused Text
The string
hello this is a test
is present at 0x264F9 on disk 2. On disk 3, the string
FOR OUTRUN EUROPA, IN A SHOP NEAR YOU SOON...
is present at 0x87A58. The game does tell you to look out for Back to the Future Part III instead.
Uncompiled Source Code
A whole lot of uncompiled source code scattered all over disk 2 and the end of disk 3.
call cas_in_close ;close it .less ld hl,&c000 ld de,here ld bc,end_here-here ldir pop bc ld (length+1),bc jp this_place .this_place ;; ** RESTORE DATA WHICH WOULD HAVE BEEN OVERWRITTEN BY FIRMWARE ** ;; !!EXAMPLE!! ld bc,&7fc4 out (c),c ld hl,&4000 ld d,l ld e,l ld bc,&0040 ldir ld de,&a700 ld b,&c0-&a7 ldir ld bc,&7fc0 out (c),c ld hl,&100 .address ld de,0 .length ld bc,0 ldir .stack ld sp,0 ;old stack back and... .stack ld sp,0 ;old stack back and... ret ;...exit to program!! .length defw 0 .filename defb "BTTF2.XXX" .end_filename .end_here dress nolist write"loader" let mode=0 ;screLE!! ld bc,&7fc4 out (c),c ld hl,&4000 ld d,l ld e,l ld bc,&0040 ldir ld de,&a700 ld b,&c0-&a7 ldir ld bc,&7fc0 out (c),c ld bc,&7fc1 out (c),c ld hl,(length-here+&c000) ld bc,&7fc0 out (c),c ld c,l ld b,h ld hl,&100 .address ld de,0 .stack ld sp,0 ;old stack back and... ret ;...exit to program!! .length defw 0 .length2 defw 0 .filename defb "BTTF2.XXX" .end_filename .end_here write"loader" let mode=0 ;scree+&4000) ldir ld hl,(length2-here+&4000) ld bc,&7fc0 out (c),c .marker ld a,0 or a jp z,end_it ld c,l ld b,h ld hl,&8000 ldir .end_it ld bc,&7fc4 out (c),c ;turn of disc error messages ld a,&c9 ld (txt_output),a ;prevent printing of text characters ;don't get error messages corrupting screen ;; ** LOAD FILE USING FIRMWARE ** ld b,end_filename-filename ;length of filename ld hl,filename-here+&c000 ;address of filename in memory ld e,l ld d,h call cas_in_open ;open file push bc ld hl,&100 ;HL = load address, BC = length of file call cas_in_direct ;r ;...exit to program!! .filename defb "BTTF2.XXX" .end_filename .end_here let mode=0 ;screth+1),bc jp this_place .this_place ;; ** RESTORE DATA WHICH WOULD HAVE BEEN OVERWRITTEN BY FIRMWARE ** ;; !!EXAMPLE!! ld bc,&7fc4 out (c),c ld hl,&4000 ld d,l ld e,l ld bc,&0040 ldir ld de,&a700 ld b,&c0-&a7 ldir ld bc,&7fc0 out (c),c ld hl,&100 .address ld de,0 .length ld bc,0 ldir .stack ld sp,0 ;old stack back and... BTTF2.XXX de=0 ;scre isable ;disable lower rom ;; ** INITIALISE DISK ROM FOR LOADING/SAVING ** ld c,7 ;disk rom ld de,&0040 ;lowest useable byte of memory ld hl,&b0ff ;highest useable byte of memory call kl_init_back ;initialise disk rom xor a ;select drive (A) ld (&ac00),a ld a,&ff ld (&be78),a ;turn of disc error messages ld a,&c9 ld (txt_output),a ;prevent printing of text characters BTTF2.XXX d_here let mode=0 ;scre OF ** ;; ** FIRMWARE ** .here ld (stack+1),sp ;save stack used by program ld sp,&c000 ;new stack used by firmware and load routines ;; ** SAVE DATA OVERWRITTEN BY FIRMWARE ** ;; !!EXAMPLE!! ld hl,(&ae72) ld (address+1),hl ld hl,(&ae74) ld (end_filename-3),hl ld a,(&ae76) ld (end_filename-1),a ld hl,&8000 ld a,(&ae73) cp &80 jp nz,next ld hl,&4000 .next ld (addr+1),hl ld bc,&7fc4 out (c),c ld hl,&0000 ld de,&4000 ld bc,&0040 ldir ld hl, OF ** ;; ** FIRMWARE ** ld (stack+1),sp ;save stack used by program ld sp,&c000 ;new stack used by firmware and load routines ;; ** SAVE DATA OVERWRITTEN BY FIRMWARE ** ;; !!EXAMPLE!! ld hl,(&ae72) ld (address+1),hl ld hl,(&ae74) ld (end_filename-3),hl ld a,(&ae76) ld (end_filename-1),a ld a,&80 ld a,(&ae73) cp &80 jr nz,next ld a,&40 .next ld (addr+2),a ld bc,&7fc4 out (c),c ld hl,&0000 ld de,&4000 ld bc,&0040 ldir ld hl,&a800 ld b,,c .stack ld sp,0 ;old stack back and... ret ;...exit to program!! .length defw 0 .length2 defw 0 .filename defb "BTTF2.XXX" .end_filename .end_here write"loader" let mode=0 ;scree+&4000) ldir ld hl,(length2-here+&4000) ld bc,&7fc0 out (c),c .marker ld a,0 or a jp z,end_it ld c,l ld b,h ld hl,&8000 ldir .end_it ld bc,&7fc4 out (c),c ld hl,&4000+&1900+&40 .addr ld de,&8000 ld bc,&1700 ldir ld bc,&7fc0 out (c) BTTF2 DAT
The Back to the Future series
| |
---|---|
MSX | Back to the Future |
NES | Back to the Future • Back to the Future Part II & III |
SNES | Super Back to the Future Part II |
Genesis | Back to the Future Part III |
Master System | Back to the Future Part II • Back to the Future Part III |
Commodore 64 | Back to the Future Part II |
DOS | Back to the Future Part II • Back to the Future Part III |
ZX Spectrum | Back to the Future • Back to the Future Part II |
Amstrad CPC | Back to the Future Part II |
Atari ST | Back to the Future Part II |
Amiga | Back to the Future Part II |
Windows, Wii | Back to the Future: The Game |
Categories:
- Pages missing developer references
- Games developed by Probe Software
- Pages missing publisher references
- Games published by Image Works
- Amstrad CPC games
- Pages missing date references
- Games released in 1989
- Games with uncompiled source code
- Games with unused text
- Games with hidden level selects
- Back to the Future series
Cleanup > Pages missing date references
Cleanup > Pages missing developer references
Cleanup > Pages missing publisher references
Games > Games by content > Games with hidden level selects
Games > Games by content > Games with uncompiled source code
Games > Games by content > Games with unused text
Games > Games by developer > Games developed by Throwback Entertainment > Games developed by Acclaim Entertainment > Games developed by Acclaim Studios Cheltenham > Games developed by Acclaim Studios London > Games developed by Probe Entertainment > Games developed by Probe Software
Games > Games by platform > Amstrad CPC games
Games > Games by publisher > Games published by Throwback Entertainment > Games published by Acclaim Entertainment > Games published by Arena Entertainment > Games published by Mirrorsoft > Games published by Image Works
Games > Games by release date > Games released in 1989
Games > Games by series > Back to the Future series