Convert vb4 16 bit to vb4 32 bit
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Original Message
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Name: bocean99
Date: March 3, 2007 at 07:52:28 Pacific
Subject: Convert vb4 16 bit to vb4 32 bitOS: Win 98CPU/Ram: 128Model/Manufacturer: Clone |
Comment: Hello I have a small program that was written in vb4 16 bit on a 286 on win3.1, and want to replace the hardware to Pentium hardware running Win 98 or xp and need the source code recompiled to at least vb 4 32 bit. I have tried to contact the orginal programer, but is no longer around. So I am looking for someone with vb4 32 bit to recompile for me. Thanks in adwance, bocean@auracom.com
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Response Number 1
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Name: IVO
Date: March 3, 2007 at 09:12:06 Pacific
Subject: Convert vb4 16 bit to vb4 32 bit |
Reply: (edit)Even under XP you can run a legacy 16 bit application, no matter the processor originally involved, as the system gives the needed support via the NTVDM emulator that converts the int 21h (and some other DOS/BIOS functions) to the 32 NT Win API. May be you face some constraints and if so you have to plan a recompilation/redesign, not needed however to perform a plain porting. Under Win 98 no problems should arise as the kernel is DOS based and again the x86 architecture is upward compatible from the 8088 to the Core 2 DUO or AMD equivalent.
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Response Number 3
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Name: bocean99
Date: March 4, 2007 at 02:58:29 Pacific
Subject: Convert vb4 16 bit to vb4 32 bit |
Reply: (edit)Ok, Some more info, the hardware that this was compiled and running on was a 286 with win 3.1 and runs fine. This hardware is just about dead and need to get it to run on newer hardware, so I tried to just put in the working hard drive into a Pentium 2 system and it boots up fine and the program runs and looks normal but the computer is connected to an electronic scale via serial port #1 and will not receive and input from this scale. I checked to see if there was a signal comming through using terminal and it was fine, but woud not work from inside the program. So I thought that it might be because of the new type of serial cards in the pentium, so replaced with the old from the 286. Same results. So I tried another computer running xp and copied the vb runtime files for the 16 bit app and same results, runs fine can change screens but no input from scale. I have to admit I know all most nothing about vb and at the point of paying someone to have a look at the source code and getting it to work on Pentium based hardware. Operating systems are no problem , whatever is the easiest to make this work. Any ideas Thanks bocean99
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Response Number 4
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Name: IVO
Date: March 4, 2007 at 03:32:42 Pacific
Subject: Convert vb4 16 bit to vb4 32 bit |
Reply: (edit)DOS/Win 3.X based applications may have troubles accessing serial COM ports under NT kernel systems as these are protected resources in those environments. Recompiling may be a way, another workaround is to run your application inside the MS VirtualPC 2004 that you can download for free from Microsoft website. You need a legal copy of DOS or Win 3.X (if the runtime is a Win application) to feed the virtual machine. Under Win 98 no problems should arise communicating through the COM port due to the DOS based kernel.
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