'===========================================================================
' Subject: TSR PHONE DIALER DEMO             Date: Year of 1990           
' Author:  Jonathan Zuck                     Code: PB                     
' Origin:  FidoNet POWER_BAS Echo          Packet: PB.ABC
'===========================================================================
'I've seen some messages lately about doing TSR's in BASIC and
'thought I'd share one that I came across.  It was included in
'the .zip file I downloaded it in, so I assume it's alright to
'distribute.  Here it is....

'======================================================================
'=  DialTSR  (TSR Phone Dialer Demonstration)                         =
'=  by Jonathan Zuck                                                  =
'=  Copyright 1990, User Friendly, Inc.                               =
'=                                                                    =
'=       bc dialtsr /o;                                               =
'=       link /noe /nod dialtsr str00512 _noval _noread , , nul , pdq =
'=       exe2com dialtsr                                              =
'=                                                                    =
'======================================================================

DEFINT A-Z
'$INCLUDE: 'PDQDECL.BAS'

DIM Registers AS RegType          'RegType is defined in PDQDECL.BAS
One = 1                           'these variable save code size below
Two = 2
Three = 3
Seven = 7

DialStr$ = "ATDT"                 'These are for Hayes compatible
HangStr$ = "ATH"                  '  modems

'I chose to use the BIOS here for a number of reasons:
'  1. There is less code overhead
'  2. There are fewer compatibility questions
'  3. It parallels the FNBIOSPrint routine in SETUPTSR.BAS and as
'     such has greater application then OUTs

DEF FNBIOSDial% (Character)
    FNBIOSDial% = 0                'assume no errors
    Registers.AX = 256 + Character 'put the character into AL, 1 into AH
    Registers.DX = 0               'specify Com1: (use 1 for Com2: etc.)
    Interrupt &H14, Registers      'call the BIOS write service
    PRINT HEX$(Registers.AX)
    IF Registers.AX AND &H8000 THEN   'check bit 7 of AH, error if set
       FNBIOSDial% = -1
    END IF
END DEF

'Modem initialization, only need once and it doesn't matter if the
'underlying applications change it.  In fact, if you have executed
'a command like:
'   MODE COM1:9600,N,8,1,P
'you don't need to initialize at all

Registers.AX = 67             'put the character into AL, 0 into AH
Registers.DX = 0              'specify Com1: (use 1 for Com2: etc.)
Interrupt &H14, Registers     'call BIOS

ID$ = "ResDial (c) 1990 User Friendly, Inc. - press Ctrl-D to activate"
Row = CSRLIN                  'print at the current cursor location
Column = POS(0)

PDQPrint ID$, Row, Column, Seven

ScrnSize = 480                  '3 lines * 80 cols for prompt & input
BufSeg = AllocMem%(ScrnSize)    'allocate memory to save the screen
DEF SEG = 0                     'see what type of monitor
IF PEEK(&H463) = &HB4 THEN ScrSeg = &HB000 ELSE ScrSeg = &HB800
Num2Dial$ = "                                 "

'----- set up the TSR as a pop-up using Ctrl-D
CALL PopUpHere(&H420, ID$)  'Ctrl-D, pass the unique ID string
GOTO EndIt                  'skip past the interrupt handler below

'----- the following code is invoked each time Ctrl-D is pressed
BlockCopy ScrSeg, Zero, BufSeg, Zero, ScrnSize  'save the underlying scr
Row = CSRLIN                                    'and the cursor location
Column = POS(0)

'----- draw a box and prompt for the phone number
PDQPrint "+-------------------------------------------------------------
PDQPrint "| Enter a phone number to dial:
PDQPrint "+-------------------------------------------------------------

LOCATE 2, 33                                 'position the cursor
BIOSInput Num2Dial$, 112                     'get number

'This is where we dial the number:

FOR X = 1 TO 4
    Char = ASC(MID$(DialStr$, X, One))       'first send the "ATDT"
    ComErr = FNBIOSDial%(Char)
    IF ComErr THEN GOTO NoCom
NEXT

FOR X = 1 TO 33                    'now the number, spaces ignored
    ComErr = FNBIOSDial%(ASC(MID$(Num2Dial$, X, One)))
    IF ComErr THEN GOTO NoCom
NEXT

ComErr = FNBIOSDial%(13)           'all AT commands terminate with
IF ComErr THEN GOTO NoCom          ' a CR

PDQPrint "Dialing, hit a key to hang up:", Two, Three, Seven

WHILE BIOSInkey% = 0: WEND         'Now pick up the phone...
FOR X = 1 TO 3                     'and hang up the modem
    ComErr = FNBIOSDial%(ASC(MID$(HangStr$, X, One)))
    IF ComErr THEN GOTO NoCom
NEXT

NoCom:
BlockCopy BufSeg, Zero, ScrSeg, Zero, ScrnSize  'restore the screen cont
LOCATE Row, Column                              'and the cursor location

CALL PopDown                                    'back to underlying app.

EndIt:
CALL EndTSR(ID$)                        'this installs us as a TSR