Q65548: PDS 7.10 Can Now Buffer COM1 or COM2 Input Data During a SHELL
Article: Q65548 Product(s): See article Version(s): 7.10 | 7.10 Operating System(s): MS-DOS | OS/2 Keyword(s): ENDUSER | SR# S900904-18 B_QuickBas | mspl13_basic Last Modified: 21-SEP-1990 In most versions of Microsoft BASIC Compiler and QuickBASIC, during a SHELL, data coming in through the communications port is not buffered and is lost. A new feature of Microsoft BASIC Professional Development System (PDS) version 7.10 allows programs compiled with the BC /O (stand-alone) option to continue to buffer communications input during a SHELL. However, programs that use the run-time module with BASIC PDS 7.10 still cannot handle COM1 or COM2 input during a SHELL. This information applies to Microsoft BASIC PDS 7.10 for MS-DOS and MS OS/2. The above feature is not available in the following products: Microsoft QuickBASIC versions 1.00, 1.01, 1.02, 2.00, 2.01, 3.00, 4.00, 4.00b, and 4.50 for MS-DOS; Microsoft BASIC Compiler versions 6.00 and 6.00b for MS-DOS and MS OS/2; and Microsoft BASIC PDS version 7.00 for MS-DOS and MS OS/2. This feature is available only when you compile with BC /O. The /O compiler switch causes the program to be completely stand alone, which means it will run without the run-time module. This feature is not available with the run-time module because the run-time module is taken out of memory during a SHELL and reloaded when the SHELL is exited. Since the code for communications support is contained in the run-time module, it is not available during the SHELL. Therefore, the program cannot continue to buffer the communications data because the code that supports communications has been removed from memory. With a stand-alone program, the code for communications support is directly linked to the program and stays in memory, thus allowing the program to continue to buffer communications data during a SHELL.
THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY.
Copyright Microsoft Corporation 1986-2002.