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COMM.SWG
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0034_Uart Detection.pas
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Pascal/Delphi Source File
|
1994-01-27
|
1KB
|
55 lines
{
> I'm looking for a pascal V6 program to detect the UART-type installed.
}
program ComType;
{ Detect the type/presence of a comport-chip.
Norbert Igl, 5/92 }
uses
crt;
Const ComPortText :
Array[0..4] of String[11] =
(' N/A ',
'8250/8250B ',
'8250A/16450',
' 16550A ',
' 16550N ');
IIR = 2;
SCRATCH = 7;
Var PortAdr : Array[1..4] of Word absolute $40:0;
function ComPortType(ComX:byte):byte;
BEGIN
ComPortType:=0;
if (PortAdr[ComX] =0)
or (Port[PortAdr[ComX]+ IIR ] and $30 <> 0)
then exit; {No ComPort !}
Port[PortAdr[ComX]+ IIR ] := 1; {Test: enable FIFO}
if (Port[PortAdr[ComX]+IIR] and $C0) = $C0 {enabled ?}
then ComPortType := 3
else If (Port[PortAdr[ComX]+IIR] and $80) = $80 {16550,old version..}
then ComPortType := 4
else begin
Port[Portadr[ComX]+SCRATCH]:=$AA;
if Port [Portadr[ComX]+SCRATCH]=$AA {w/ scratch reg. ?}
then ComPortType:= 2
else ComPortType:= 1;
end;
END;
var com : byte;
begin
clrscr;
writeln('COMPORT Chiptest':75);
writeln('Freeware by Norbert Igl, Germany':75);
writeln;
for com := 1 to 4 do
writeln('COM:',com,': ', ComPortText[ComPortType(com)]);
end.