Title : Frank N Stein

Publisher : PSS

Release Year: 1984

No. Players: 1

Entry Type: Arcade: Platform

Machine Type: ZX-Spectrum 48K

Availability: Available


Controls:
  • Cursor
  • Interface 2 (right)
  • Kempston

Comments: cf. {software|0026834}.

Updated On : May 25, 2020


Roles :
Frank N Stein:
Known Errors: Bugfix provided by the author Colin Stewart:#
  • It's impossible to complete level 25 within the time limit. This can be fixed by adding an extra electric-shock item, giving the player more time.#Fixed using POKE 26131,3: POKE 26132,16: POKE 26133,8
#Bugfix provided by Battle Bunny:#
  • The game randomly crashes after a few levels due to stack overflow as the machine stack eventually gets big enough to interfere with the screen data. The worst case is an implicit PUSH caused by the line "740C CD3775 CALL $7537". There are several places where the sub-routine starting at $7537 branches out with a "JP $7531", which does "CALL $81A4 : JP $7387", from where it's possible to get back down to $740C and do the "CALL $7537" again without having done a RET from the previous time. This case is fixed using the following patch:#
            org  $75AB               ; 30123^        JP   PATCH1              ; 195 114 196^        org  $75D1               ; 30161^        JP   PATCH1              ; 195 114 196^        org  $765B               ; 30299^        JP   PATCH1              ; 195 114 196^        org  $7687               ; 30343^        JP   PATCH1              ; 195 114 196^                                 ; discard unused return address^        org  $C472               ; 50290^PATCH1: POP  BC                  ; 193^        CALL $81A4               ; 205 164 129^        JP   $7387               ; 195 135 115
  • The remaining (less serious) cases of stack overflow can all be fixed by simply resetting the stack pointer at the end of each level, using the following patch:#
            org  $9BBF               ; 39871^        JP   PATCH2              ; 195 121 196^                                 ; reset stack pointer at end of level^        org  $C479               ; 50297^ERR_SP: equ  $5C3D               ; 23613^PATCH2: LD HL, (ERR_SP)          ; 42  61  92^        DEC HL                   ; 43^        DEC HL                   ; 43^        LD SP, HL                ; 249^        JP $6F16                 ; 195 22 111
#Modified "BUGFIX" file provided by Einar Saukas.