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COMM.SWG
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0077_Simple Fossil Comm Unit.pas
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Pascal/Delphi Source File
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1995-05-26
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3KB
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138 lines
{
> Does anyone have any units that will allow me to use a fossil in my
> programs? If so, are these units preset for printing to the screen and
> the modem? I would VERY much apprecieate any help.
Here is a copy of my very own fossil interface, I made them because I
couldn't find simple/good enough code out there. I like 'em because of
their simplicity. Only the basic commands are here, if you want to add
more then download X00 (or the fido specs) for a chart of the functions
and add your own.
}
Unit FComm;
interface
function Comm_Init(port:byte):boolean;{Inits the port for communications,
returns true if successfull}procedure Comm_DeInit;{DeInits the port}
procedure Comm_Baud(baud:word);{Sets the speed of the port (not needed), always
uses 8N1}procedure Comm_DTR(DTR_Up:boolean);{raises/lowers DTR}
function Comm_Carrier:boolean;{TRUE if Carrier detected}
procedure Comm_Tx(sendbyte:byte);{Send a byte to port}
function Comm_Rx_Ready:boolean;{TRUE if char waiting in buffer}
function Comm_Rx:byte;{Get a byte from port}
implementation
var Comm_Port:word;{Port to use, in FOSSIL format. ie. COM1=0}
StatBit:Word;{Status Bit}
function Comm_Init(port:byte):boolean;
var t:word;
begin
Comm_Port:=port-1;
asm
mov ah, 4h
mov dx, Comm_Port
int 14h
mov t, ax
end;
Comm_Init:=t=$1954
end;
procedure Comm_DeInit;
begin
asm
mov ah, 5h
mov dx, Comm_Port
int 14h
end;
end;
procedure Comm_Baud(baud:word);
var Newbaud:byte;
begin
Case Baud div 10 of {finds the bit value version of the baud}
30: Newbaud:=$43;
60: Newbaud:=$63;
120: Newbaud:=$83;
240: Newbaud:=$A3;
480: Newbaud:=$C3;
960: Newbaud:=$E3;
1920:Newbaud:=$03;
3840:Newbaud:=$23;
end;
asm
mov ah, 0h
mov al, Newbaud
mov dx, Comm_Port
int 14h
end;
end;
procedure Comm_DTR(DTR_Up:boolean);
var DTRBit:byte;
begin
If DTR_Up
then DTRBit:=1
else DTRBit:=0;
asm
mov ah, 6h
mov al, DTRBit
mov dx, Comm_Port
int 14h
end;
end;
function Comm_Carrier:boolean;
begin
asm
mov ah, 3h
mov dx, Comm_Port
int 14h
mov StatBit, ax
end;
Comm_Carrier:=(StatBit and 128) <> 0; {Bit 7=CD Signal}
end;
procedure Comm_Tx(sendbyte:byte);
begin
asm
mov ah, 1h
mov al, SendByte
mov dx, Comm_Port
int 14h
end;
end;
function Comm_Rx_Ready:boolean;
begin
asm
mov ah, 3h
mov dx, Comm_Port
int 14h
mov StatBit, ax
end;
Comm_Rx_Ready:=(StatBit and $100) <> 0;{Bit 0 of AH!}
end;
function Comm_Rx:byte;
var temp:byte;
begin
asm
mov ah, 2h
mov dx, Comm_Port
int 14h
mov temp, al
end;
Comm_Rx:=temp;
end;
end .{Unit}