Protection for +D and Multiface

             >>>>> +D and Multiface Protection <<<<<            

          -= By Vision Of The Mad Guys Corp. =-

The following two routines protect your programs to get "snaped" or "multifaced". I don't know wether you'll find this useful, but I don't like to see my programs being rubbished or hacked when they weren't supposed to.

To switch off the SNAP function of the +D (only printer options will work) use the follwong Poke:

POKE @161,201

If no +D is attached this will probably end with an error message, so it is better to use assembler as it then makes no difference wether a +D is attached or not:

DI              ;Disable interrupts
IN A,(231)      ;Page in +D
PUSH AF         ;Save A register
LD A, 201       ;Equal to POKE
LD (8353),A     ;@161,201
POP AF          ;Restore A register
OUT (231),A     ;Page out +D
EI              ;Enable interrupts
RET             ;Return to Basic

Note that the +D ROM/RAM are exchanged when you use MC:
Basic: RAM 0-8191, ROM 8192-16383
MC : RAM 8192-16383, ROM 0-8191

To disable the Multiface use the following routine:

     DI           ;Disable interrupts
     IN A,(159)   ;Page Multiface in
     LD HL,OFF    ;Copy protection
     LD DE,8192   ;routine into
     LD BC,6      ;Multiface RAM
     LDIR
     IN A,(31)    ;Page Multiface out
     EI           ;Enable interrupts
     RET
OFF  DEFB 0,0,255,82,85,78

Note that the Multiface will only get disabled if it is switched on! To get around this problem the routine should run by interrupt! If the Multiface button is then pressed the program stops for a second and then continues. Tested on a Multiface 1 so other reactions might occur with other Multifaces!

Michael Meyer, Struempellstr. 6/14038, 40225 Duesseldorf
Germany

(NOTE FROM L.A.)
This is not to be used as I haven't got Vision's permission for it to be used in any of our stuff!! But Who Gives a Fuck????

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         Bollocks, Bollocks, and more Bollocks!

                        wey-hey!

               Bollocks Productions 1994!

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