Terrible performance of direct cable connection

I have just setup a direct cable connection between my laptop and desktop machines, both running the same version of Win-95. Everything seems to work ok but it is terribly slow. Although I am using a serial cable I would expect it to run as fast as the DOS based INTERSVR mechanism for transfering files. Initially COM2 was set to 9600 baud but changing it to 115200 baud under the control panel didn't seem to make that much difference.

Any ideas?

Many thanks in advance.

Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Direct cable connections are just extremely slow. The maximum speed is indeed 9600 baud, and that Windows would change it to 115200 baud is just stupid (viva Microsoft !), because it cannot be higher than 9600. If you don't believe me, check the maximum speed available for a serial mouse, since it is also connected to a COM-port. If you want higher speeds, then I recommand you buy to ethernet cards, and if you want it really fast, buy two fast ethernet cards. Those onces can get 100 Mbps instead of 10 Mbps.

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
aecooperAuthor Commented:
Is there a service pack or something that will get around this limitation?
Parallel cables transmit data simultaneously over multiple lines, making it the faster of the two connection methods. Serial cables transmit data sequentially over one pair of wires, and are slower than parallel cables.
Use a serial cable only if a parallel port is unavailable.
Cloud Class® Course: Microsoft Azure 2017

Azure has a changed a lot since it was originally introduce by adding new services and features. Do you know everything you need to about Azure? This course will teach you about the Azure App Service, monitoring and application insights, DevOps, and Team Services.

aecooperAuthor Commented:
I can get perfectly acceptable transfer rates over the serial cable by using either DOS's INTERSVR or a dedicated PPP-TCP/IP connection under Linux. Both mechanisms run at 115200. Therefore the problem lies with MS-Windows 95 - hence my previous comment about a service patch etc.
You might try to set the parallel port to EPP on both machines in bios.
Adam LeinssServer SpecialistCommented:
Zerquish absolutely hit the nail right on the head with this one.  DCC is slow.  Serial transmits at 1 bit at a time, parallel 8 bits at a time.  If you need ultra fast access between two machines, use 2 networks cards and a cross over cable.  Nothing you say will convince me that serial is fast.  Nothing.
aecooperAuthor Commented:
No one is saying its fast, its just that under a decent operating system, like Linux, I can get a PPP connection that is 6-8 times faster. In fact you can increase the baud rate. MSWIN95 sets up a couple of null modems for the direct cable connection and these modems were set to 19600 (this seemed to be the bottle neck). However increasing the baud rate just made the connection more unreliable. I'll just use INTERSVR from now on - at least that will go at 115200.
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Windows OS

From novice to tech pro — start learning today.