Monday, January 26, 2009

Common DOS Errors

In my years experience in programming with CA-Clipper, the most common DOS errors encountered are Dos Error 2, 3, 4, 5 and 32. 

However, I have noticed posts on comp.lang.clipper regarding other DOS errors. So here's the full list of DOS errors and my recommended action (if any) to take :

Error No.DescriptionSugggested Action

1Invalid function number

2File not foundMake sure that the named file is present in the relevant directory.

3Path not foundCheck Autoexec.bat to ensure the path is correctly set up.

4Too many open files (no handles left)Increase the FILES statement in Config.sys (or Config.nt - for Windows NT). If you are using Novell Netware, don't forget to have the same FILES HANDLES statement in Shell.cfg or Net.cfg.

5Access deniedIf you are using 5.3a, click here to read Jo French's comments on the false error message.

6Invalid handle

7Memory control blocks destroyed

8Insufficient memory

9Invalid memory block address

10Invalid environment

11Invalid format

12Invalid access code

13Invalid Data


15Invalid drive was specified

16Attempt to remove current directory

17Not same device

18No more files

19Attempt to write on write-protected diskette

20Unknown unit

21Drive not ready

22Unknown command

23Data error (CRC)

24Bad reuest structure length

25Seek error

26Unknown media type

27Sector not foundSigns of HDD corruption. Use Scandisk to fix.

28printer out of paper

29write fault

30Read fault

31General failure

32sharing violition

33lock violition

34Invalid disk change

35FCB unavailable

36Sharing buffer overflow

37 - 49Reserved

50Network request not supported

51Remote computer not listening

52Duplicate name on network

53Network name not found

54Network busy

55Network device no longer exists

56Network BIOS command limit exceeded

57Network adapter hardware error

58Incorrect response from network

59Unexpected network error

60Incompatible remote adapter

61Print queue full

62Not enough space for print file

63Print file deleted (not enough space)

64Network name deleted

65Access denied

66Network device type incorrect

67Network name not found

68Network name limit exceeded

69Network BIOS session limit exceeded

70Temporarily paused

71Network request not accepted

72Print or disk redirection paused


80File already exists


82Cannot make directory entry

83Fail on INT 24H

84Too many redirections

85Duplicate redirections

86Invalid password

87Invalid parameter

88Network device fault

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Welcome to Clipper... Clipper... Clipper

In 1997, then using Delphi 3, I had already created 32-bits Windows applications for HRIS, ERP and CRM. In 2007, using Ruby on Rails, an AJAX powered CRM site running on Apache & MySQL was created and I am now using Visual Studio .Net 2008 to create web-based projects and Delphi 7 for Win32 applications using SQL2005 & DBFCDX.

So, why then am I reviving the Original Clipper... Clipper... Clipper via a Blog as CA-Clipper is a programming language for the DOS world ? Believe it or not, there are still some clients using my mission-critical CA-Clipper applications for DOS installed in the late 80's and up to the mid 90's. This is testimony to CA-Clipper's robustness as a language :-)

With the widespread introduction of Windows 7 64-bits as the standard O/S for new Windows based PCs & Notebooks, CA-Clipper EXE simply will not work and it has become imperative for Clipper programmers to migrate immediately to Harbour to build 32/64 bits EXEs

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This site started out as a teeny-weeny section of Who the heck is Chee Chong Hwa ? and has graduated into a full blown web site of more than 140 pages (actually hundreds of A4 size pages) ! This is due to its growing popularity and tremendous encouragements from visiting Clipperheads from 100 countries worldwide, from North America, Central America, Caribbean, South America, Europe, Middle-East, Africa and Asia-Pacific. Thanx Clipperheads, you all made this happen !

What is Clipper ?

You may ask, what is this Clipper stuff ? Could Clipper be something to do with sailing as it is the name of a very fast sailing American ship in the 19th century ?

Well, Clipper or to be precise, CA-Clipper is the premier PC-Software development tool for DOS. It was first developed by Nantucket Corporation initially as a compiler for dBase3+ programs. Since then, CA-Clipper has evolved away from its x-base roots with the introduction of lexical scoping & pre-defined objects like TBrowse. As at today, the most stable version ofClipper is 5.2e while the latest version, 5.3a was introduced on 21 May 1996.

As at 11th November, 1996, an unofficial 5.3a fixes file was made available by Jo French. See the About CA-Clipper 5.3a section for more details. BTW, Jo French uploaded the revised 5.3a fixes file on 20th November, 1996.

Latest News

The latest news is that CA has finally released the long-awaited 5.3b patch on 21 May, 1997.

For 5.3b users, you must a take a look at Jo French's comments on unfixed bugs in 5.3b.

BTW, have you used Click ? If you're a serious Clipperprogrammer and need an excellent code formatter, Click is a natural choice. How to get it ? Simple, access Phil Barnett's site via my Cool Clipper Sites.

32-bits Clipper for Windows ?

Have you tried Xbase ++ ? Well, I have and compared to Delphi (my current Windows programming tool of choice), I'm still sticking to Delphi.

Anyway, you should visit the Alaska Home Page. Give it a chance and then draw your own conclusions !.

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