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Names: »READ.ME«
└─⟦5e4548e7d⟧ Bits:30005778 Turbo Pascal v.3.01A (CP/M-86)
└─⟦this⟧ »READ.ME«
Welcome to TURBO PASCAL Version 3.0!
------------------------------------
In spite of all efforts, some errors have found their way into
the new TURBO 3.0 manual. This file contains all necessary cor-
rections and additions, and we apologize for any inconvenience
this may cause you.
At the end of this file, you will find a summary of the new
features introduced in version 3.0 and a list of additional files
present on your TURBO disk.
*******************************************
* *
* Need help with TURBO? Please see *
* Appendix N in your Reference Manual *
* for answers to common questions. *
* *
*******************************************
-------------------
CORRECTIONS
-----------
Page 253 - MOV AL,ÆBP-1Å
------------------------
The correct statement is: MOV AL,ÆBP+4Å
Page 293 - TURBO-BCD will compile and run any program
-----------------------------------------------------
Well - almost. The Real functions Sin, Cos, ArcTan, Ln, Exp,
and Sqrt and the pre-declared constant Pi are not available
in TURBOBCD.
-------------------
OMISSIONS
---------
User Written Error Handlers
---------------------------
In Turbo Pascal 3.00 you may write your own error handler,
which is called in case of an I/O or Run-time error. The
procedure must have the following header:
procedure Error(ErrNo, ErrAddr: Integer);
The name of the procedure and its parameters are unim-
portant, as long as it is a procedure with two value
parameters of type Integer.
The value passed in ErrNo is the error type and number. The
most significant byte, i.e. "Hi(ErrNo)", contains the error
type, and the least significant byte, i.e. "Lo(ErrNo)",
contains the error number (see Appendix F or G in the Turbo
Pascal Manual).
The following error types are defined:
0 User Break (Ctrl-C).
1 I/O error.
2 Run-time error.
In case of a user interrupt (Ctrl-C), the low byte of
"ErrNo" is always 1. "ErrAddr" contains the address (offset
in Code Segment for 16 bit versions) of the error.
To activate the error handler, assign its offset address
to the standard variable "ErrorPtr", i.e.
ErrorPtr:=Ofs(Error); æ 16 bit å or
ErrorPtr:=Addr(Error); æ 8 bit å
There are no limits to what an error handler may do. Typi-
cally it will close all open files, output an error mes-
sage, and call the Halt standard procedure to terminate the
program. If an error handler returns, i.e. if it does
not call Halt, or if an error occurs within an error
handler, Turbo Pascal will itself output the error message
and terminate the program.
-------------------
OVERVIEW OF NEW FEATURES OF TURBO 3.0
-------------------------------------
A program that was written using TURBO 2.0 may behave differently
using TURBO 3.0:
- TURBO no longer does a ClrScr when your program first begins.
- TURBO no longer does a GoToXY(1, 25) when your program terminates.
- The handling of some logical devices has been changed to conform
with standard Pascal and with TURBO's handling of other files:
1. A read statement using the logical device TRM is now buffered
and terminates with a <CR>.
2. The KBD device is not buffered. For this reason, look-ahead
functions (EOF, EOLN, readln) used on the KBD device will al-
ways "wait" for a key to be pressed.
Chain and Execute
-----------------
Heap preserved during Chain (MS/PC-DOS & CP/M-86).
Chain and Execute no longer set a flag in the command line
parameter.
Inline
------
A constant identifier used in an INLINE statement does not
always generate two bytes of code.
Files
-----
Append procedure (MS/PC-DOS).
Full DOS path-name supported (MS/PC-DOS).
I/O re-direction (MS/PC-DOS).
New FIB formats.
Optional parameter on text file declaration sets buffer size
(MS/PC-DOS & CP/M-86).
Optional parameter on Reset/ReWrite sets record size for
untyped files (MS/PC-DOS).
Optional 4th parameter on Blockread/Write sets block size.
Read and ReadLn work with array of char (MS/PC-DOS & CP/M-86).
Seek procedure may take Real argument (MS/PC-DOS).
SeekEoln function.
SeekEof function.
Truncate procedure (MS/PC-DOS).
Misc.
-----
ChDir procedure (MS/PC-DOS).
Command line parameters on Options menu (MS/PC-DOS and CP/M-86).
Delay procedure independent of processor speed (PC-DOS).
Exit procedure.
Extended graphics procedures & functions (see page 309 in
manual for overview).
GetDir procedure (MS/PC-DOS).
MkDir procedure (MS/PC-DOS).
Multiple EXTERNAL subprograms in one file (MS/PC-DOS & CP/M-86).
Optional parameter on Halt to return error code (PC/MS-DOS).
OvrPath procedure (MS/PC-DOS).
OvrDrive procedure (CP/M).
ParamCount function.
ParamStr function.
RmDir procedure (MS/PC-DOS).
Runs overlays in Memory mode (MS/PC-DOS & CP/M-86)
Turtlegraphics procedures, functions, and constants (see
page 309-310 in manual for overview).
Overlays
--------
Overlays can be run in Memory mode (MS/PC-DOS & CP/M-86).
Overlay files are opened and closed every time they are
accessed. Therefore, there is never a need to specifically
close an overlay file.
The Y compiler directive is no longer supported. Instead,
the OvrPath (MS-DOS) or OvrDrive (CP/M) standard proce-
dures may be used to specify the drive and subdirectory
in which overlay files reside.
-------------------
TURBO PASCAL Version 3.0 CP/M-86
Additional File List
In addition to the list of files mentioned in Chapter 1 of
your TURBO Reference Manual, the following files are included
on your TURBO disk:
ACCESS3 BOX - for TOOLBOX users only: ACCESS.BOX update
Sample programs
---------------
LISTER PAS - simple program to list your Pascal source
CMDLIN PAS - get parameters from the command line
CALC PAS - sample spreadsheet program
CALC HLP - spreadsheet help file
CALCDEMO MCS - spreadsheet data file (not for use with TURBO-87)
CALCMAIN PAS - extra program for compiling spreadsheet if necessary
(please see note inside CALCMAIN.PAS)
Special versions of TURBO
-------------------------
These files will only be present on your disk if you have TURBO
with one (or both) of our extended real number packages.
TURBO with 8087 Support
-----------------------
TURBO-87 CMD - TURBO PASCAL compiler with 8087 support
HILB PAS - demonstrates increased speed and precision of
TURBO-87
TEST PAS - demonstrates increased speed and precision of
TURBO-87
TURBO with BCD Reals
--------------------
TURBOBCD CMD - TURBO PASCAL compiler with BCD reals
BCD PAS - demonstrates increased precision of TURBOBCD
---------------------------------------------------------------------
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