Date   : Sun, 14 Apr 1985 10:46:17-MST
From   : Jim Forrest <JFORREST@SIMTEL20.ARPA>
Subject: Help needed - TURBO & Anchor XII (Long)

A friend has a Kaypro10 (like mine) and has an Anchor XII modem. His BBS users
are unable to get in at 300 Baud with the following routine, although it
works at 1200 baud and works on a Hayes at 300/1200 fine. Greatly need help.
Jim

begin
  mem[$FF7C] := t[0];
  mem[$FF7D] := t[1];
  mem[$FF7E] := t[2];
  mem[$FF7F] := pred(t[3]);
  mem[$FF80] := pred(t[4]);
  mem[$FF81] := t[5]
end;


const
{ Machine specific constants }

  DataPort   = $04;          { Data port }
  StatusPort = $06;          { Status port }
  RatePort   = $00;          { Data rate (bps) port }

{ StatusPort commands }

  RESCHN     = $18;          { reset channel }
  RESSTA     = $10;          { reset ext/status }
  WRREG1     = $00;          { value to write to register 1 }
  WRREG3     = $C1;          { 8 bits/char, rx enable }
  WRREG4     = $44;          { 16x, 1 stop bit, no parity }
  DTROFF     = $68;          { dtr off, rts off }
  DTRON      = $EA;          { dtr on, 8 bits/char, tx enable, rts on }
  ONINS      = $30;          { error reset }

{ StatusPort status masks }

  DAV        = $01;          { data available }
  TRDY       = $04;          { transmit buffer empty }
  DCD        = $08;          { data carrier detect }
  PE         = $10;          { parity error }
  OE         = $20;          { overrun error }
  FE         = $40;          { framing error }
  ERR        = $60;          { parity, overrun and framing error }

{ Smartmodem result codes }

  OKAY        = '0';         { Command executed with no errors }
  CONNECT300  = '1';         { Carrier detect at 300 bps }
  RING        = '2';         { Ring signal detected }
  NOCARRIER   = '3';         { Carrier lost or never heard }
  ERROR       = '4';         { Error in command execution }
  CONNECT1200 = '5';         { Carrier detect at 1200 bps }

{ Rate setting commands }

  BD300      = 5;            { 300 bps }
  BD1200     = 7;            { 1200 bps }

function mdcarck: boolean;
{ Check to see if carrier is present }
begin
  port[StatusPort] := RESSTA;
  mdcarck := ((DCD and port[StatusPort]) <> 0)
end;

function mdinprdy: boolean;
{ Check for ready to input from modem }
var
  bt: byte;
begin
  if (DAV and port[StatusPort]) <> 0
    then
      begin
        port[StatusPort] := 1;
        if (ERR and port[StatusPort]) <> 0
          then
            begin
              port[StatusPort] := ONINS;
              bt := port[DataPort];
              mdinprdy := FALSE
            end
          else mdinprdy := TRUE
      end
    else mdinprdy := FALSE
end;

function mdinp: byte;
{ Input a byte from modem - no wait - assumed ready }
begin
  mdinp := port[DataPort]
end;

procedure mdout(b: byte);
{ Output a byte to modem - wait until ready }
begin
  repeat
  until (TRDY and port[StatusPort]) <> 0;
  port[DataPort] := b
end;

procedure mdinit;
{ Initialize the sio channel and the Hayes Smartmodem 1200 }
const
  sio_init: array[1..9] of byte = (RESCHN, 4, WRREG4, 1, WRREG1, 3, WRREG3,
5, DTROFF);
var
  i: integer;
  mdm_attn : string[2];
  mdm_init : string[41];
  bt       : byte;
begin
  for i := 1 to 9 do
    port[StatusPort] := sio_init[i];        { initialize the SIO channel }
  port[StatusPort] := 5;                    { pull DTR high }
  port[StatusPort] := DTRON;
  mdm_attn := 'AT';
  mdm_init := 'ATE0Q0V0M0X1 S0=0 S2=3 S4=255 S5=255';
  port[RatePort] := BD1200;                 {set the 8116 to 1200 baud}
  delay (500);                              {let the modem settle for a bit}
  for i := 1 to 2 do
    begin
      bt := ord(mdm_attn[i]);               {force the modem to 1200 baud}
      mdout(bt)
    end;
  bt := ord(CR);
  mdout(bt);
  delay (2000);                             {wait a sec...}
  for i := 1 to 41 do
    begin
      bt := ord(mdm_init[i]);               {initialize the modem}
      mdout(bt)
    end;
  bt := ord(CR);
  mdout(bt);
  bt := mdinp;                              { clear any previous rings }
  bt := mdinp
end;

function mdring: boolean;
{ Determine if the phone is ringing }
begin
  if mdinprdy
    then mdring := (RING = chr(mdinp))
    else mdring := FALSE
end;

procedure mdhangup;
{ Hangup modem }
var
  i        : integer;
  mdm_hang : string[4];
  bt       : byte;
begin
  repeat
    port[StatusPort] := 5;             { setup to write register 5 }
    port[StatusPort] := DTROFF;        { clear DTR, causing hangup }
    delay(2000);
    port[StatusPort] := 5;
    port[StatusPort] := DTRON;
    if mdcarck
      then
        begin
          mdm_hang := 'ATH0';
          for i := 1 to 3 do
            begin
              bt := ord(ETX);
              mdout(bt)
            end;
          delay(1500);
          for i := 1 to 4 do
            begin
              bt := ord(mdm_hang[i]);
              mdout(bt)
            end;
          bt := ord(CR);
          mdout(bt)
        end;
  until not(mdcarck)
end;

procedure mdans;
{ Detect and set system to rate at which modem answered phone }
var
  mdm_answ : string[3];
  code     : char;
  i        : integer;
  bt       : byte;
begin
  repeat
  until mdinprdy;
  bt := mdinp;
  mdm_answ := 'ATA';
  for i := 1 to 3 do
    begin
      bt := ord(mdm_answ[i]);
      mdout(bt)
    end;
  bt := ord(CR);
  mdout(bt);
  repeat
  until mdinprdy;
  code := chr(mdinp);
  if code = CONNECT1200
    then
      begin
        port[RatePort] := BD1200;
        rate := 0.02075;
        delay(500);
        bt := mdinp;
        bt := mdinp
      end;
  if code = CONNECT300
    then
      begin
        port[RatePort] := BD300;
        rate := 0.083;
        delay(500);
        bt := mdinp;
        bt := mdinp
      end;
  if code = NOCARRIER
    then mdhangup
end;