🚀 go-pugleaf

Ok Folks,

Here is the source to change the MAC II into Ntsc video.

The Slot must be between 9 and 14 inclusive.

The procedures are written in Rascal from Reed College but
the format is reliatively similar to Pascal.

I am posting the news as I have received a lot of requests to do
this.


Procedure SetInterlace(Slot:Integer);

(* Set to NTSC Video *)
Var
    CardPtr : ^Longint[15];  (* Pointer to array of longints *)
    Dummy : Integer;
    Calc   : Longint ;
Begin
    (*   CardPtr := $100000L*Slot +$80000L;  card = $00100000*slot +$80000 *)
    CardPtr := Slot;
    CardPtr := (CardPtr << 20) +$80000L;  (* << is the shift left OP *)
    
    
    CardPtr^[0] := $FF;
    CardPtr^[1] := $48;
    CardPtr^[2] := $ff;
    CardPtr^[3] := $f7;
    CardPtr^[4] := $9f;
    CardPtr^[5] := $1a;
    CardPtr^[6] := $c4;
    CardPtr^[7] := $e6;
    CardPtr^[8] := $fa;
    CardPtr^[9] := $f7;
    CardPtr^[10] := $e5;
    CardPtr^[11] := $F1;
    CardPtr^[12] := $7b;
    CardPtr^[13] := $f1;
    CardPtr^[14] := $d1;
    CardPtr^[15] := $06;
    
    CardPtr := Slot;
    CardPtr := (Cardptr <<20) +$C0000 ;
    Dummy := Cardptr^ ;   (* Must be a Longint reference *)
    
End;

Procedure ClearInterlace(Slot:Integer);

(* Set To Mac Normal video *)
Var
    CardPtr : ^Longint[15];
    Dummy : Integer;

Begin
    CardPtr := Slot;
    CardPtr := (CardPtr <<20) +$80000L;  (* card = $00100000*slot +$80000 *)
    
    CardPtr^[0] := $FF;
    CardPtr^[1] := $B8;
    CardPtr^[2] := $ff;
    CardPtr^[3] := $f7;
    CardPtr^[4] := $0f;
    CardPtr^[5] := $1a;
    CardPtr^[6] := $88;
    CardPtr^[7] := $b9;
    CardPtr^[8] := $fa;
    CardPtr^[9] := $e1;
    CardPtr^[10] := $e1;
    CardPtr^[11] := $e9;
    CardPtr^[12] := $79;
    CardPtr^[13] := $69;
    CardPtr^[14] := $d2;
    CardPtr^[15] := $02;
    
    CardPtr := Slot;
    CardPtr := (CardPtr <<20) +$B0000 ;
    Dummy := Cardptr^ ;   
    
End;