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mov ah, B mov cx, 8 @@0: rcl ah,1 jc @@1 mov al, 00000011b { Vcc = 1, SCL = 0, SDA = 0 } out dx, al call Pause mov al, 00000111b { Vcc = 1, SCL = 1, SDA = 0 } out dx, al call Pause mov al, 00000011b { Vcc = 1, SCL = 0, SDA = 0 } out dx, al jmp @@2 @@1: mov al, 00000010b out dx, al call Pause mov al, 00000110b out dx, al call Pause mov al, 00000010b out dx, al @@2: loop @@0 call Pause mov al, 00000110b out dx, al call Pause inc dx in al, dx dec dx and al, 01000000b mov ah, 1 je @@3 mov ah, 0 @@3: mov al, 00000010b out dx, al mov al, ah end;

{ Vcc = 1, SCL = 0, SDA = 1 } { Vcc = 1, SCL = 1, SDA = 1 } { Vcc = 1, SCL = 0, SDA = 1 }

{ Vcc = 1, SCL = 1, SDA = 1 }

{ Vcc = 1, SCL = 0, SDA = 1 }

function GetByte: byte; asm mov dx, lpt1 mov cx, 8 @@0: mov al, 00000110b { Vcc out dx, al call Pause inc dx in al, dx dec dx and al, 01000000b shl al,1 shl al,1 rcl ah, 1 mov al, 00000010b { Vcc out dx, al call Pause loop @@0 mov al, 00000110b { Vcc out dx, al call Pause

assembler;

= 1, SCL = 1, SDA = 1 }

= 1, SCL = 0, SDA = 1 }

= 1, SCL = 1, SDA = 1 }

mov al, 00000010b { Vcc = 1, SCL = 0, SDA = 1 } out dx, al call Pause mov al, ah end; procedure WriteByte(Addr:Word; B : Byte); begin Start; PutByte($A0 or ((Hi(Addr) shl 1) and $0e)); PutByte(Lo(Addr)); PutByte(B); Stop; Delay(5); end; function ReadByte(Addr:Word): Byte; begin Start; PutByte($A0 or ((Hi(Addr) shl 1) and $0e)); PutByte(Lo(Addr)); Start; PutByte($A1 or ((Hi(Addr) shl 1) and $0e)); ReadByte := GetByte; Stop; end; procedure ComStr; var PCStr : ^String; i: Byte; begin PCStr := Ptr(PrefixSeg, $80); for i := 0 to length(PCStr^) -1 do if PCStr^[i] in ['-', '/'] then begin case PCStr^[i+1] of 'r', 'R' : Mode := mRead; 'w', 'W' : Mode := mWrite; else Mode := mError; end; Delete(PCStr^, i, 2); Break; end; if ParamCount = 0 then Mode := mError else FileName := ParamStr(1); end; begin LPT1 := asm mov dx, mov al, out dx, end;

$378; lpt1 00000110b al

{ Vcc = 1}

ComStr; Assign(F, FileName); case Mode of mRead: begin for A:= 0 to 2047 do Buf[A] := ReadByte(A); Rewrite(F, 1);

if IOResult = 0 then begin BlockWrite(F, Buf, SizeOf(Buf)); Close(F); end; end; mWrite: begin Reset(F, 1); if IOResult = 0 then begin BlockRead(F, Buf, SizeOf(Buf)); Close(F); for A:= 0 to 2047 do WriteByte(A, Buf[A]); end; end; mError: begin WriteLn('24c16 fileName -r|-w'); WriteLn(' -r Read'); WriteLn(' -w Write'); end; end; end.

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