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Files & Tips

Over the past 8 years, we have collect numerous files and tips. Some are still needed in a few systems. We keep them here for your use and reference.
Modem Stuff
Tips from Zoom on K56 flex modems
"java errors" with Netscape 4.0x
Modem settings for Winmodem
Test your phone line for noise
Practical Perpherials #1
Practical Perpherials 56Kflex
Good Camera Links

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Tip on K56 flex by Zoom, may apply to other modems (two techs reporting)

The following is from Don Hinds - Senior Zoom Tech

56K Modems

NOTE: You cannot buy two off-the-shelf 56k modems and connect 56k between them. The host site must have a special modem \ connection to special digital equipment.

*** Even between Rockwell 56K modems you will not see any full 56k connections because at this time the maximum the phone line can support is about 53K. You are likely to see speeds in the mid 40s or even 30s because of fallback due to less than optimum line conditions. Even if your phone line supports 56K, the other line or the trunk line may not. And every connect speed may not be the same. You may connect anywhere from 38k-44k on the same phone line in the same hour. The phone company does not route every call the same way.***

You are more likely to see higher speed connects on long distance calls, because the lines are newer and cleaner than many local lines. At this time many telephone lines will not even support a 'full' v34 33.6k Connect. Most often you will see V34 Connects.

*If you are having trouble connecting at 56K speeds, try putting S202=32 in your init string. AT&F&C1&D2S202=32

*If the response seems slow after you connect, try going to 16650 UART Settings of the Modem, and set Transmit Buffers to the ¼ mark (send speed at 56k is slower so it doesn’t matter). Set the Receive Buffers to Max or to the ¾ mark.

If you flash upgraded your 56k modem, delete it from your modem list in the Control panel and re-boot the computer, then re-install the modem. Put the new mdmzoom.inf file on a disk in A: and when it gets the list to pick a modem click ‘have disk’ and pick from the new list.

NOTE: While it is theoretically possible to use a setting of 230K, at the present time most computers, drivers and so forth are not equipped to do so. You would not see any appreciable (if any) increase in speed in any case. 230K assumes maximum speed of 56k connect speed (impossible) and maximum compression of 4X (very unlikely).

NOTE: 56k modems automatically fallback to slower speeds if the line is not good for the current speed. Newer versions of 56k code probe the line more aggressively and may have a lower original connect speed. But they are less likely to have fallback than earlier code. When lines improve you will get faster speed with no changes on your part.

NOTE: The internet at times is VERY slow. When traffic increases, transfers may slow drastically, sometimes to a standstill. The same often holds true for large services like Compuserve, though they are a lot better than they used to be.

BTW, there is a website for 56K info and answers. (note from starck, I have never found this site even though it is mentioned in this email from Zoom)

Line Quality

To test the quality of your lines on v32bis modems, Type +++ and wait until you get OK. (do NOT press [Enter]). This puts you in command mode. Then you can enter AT%L?%Q? and it will give you numbers for signal level & line quality. You should get 15-30 for %L? preferably 18-25, and for Q? lower is better. 11 or below is what you should get. You can try forcing higher speeds to see if quality drops at the higher speed, or force lower to see if quality goes up. (To go back online enter ATO). NOTE: some modem work with the AT%L? only. Sometimes your speeds may go down. If the phone company installs a Mulitplexer on your lines you are likely to lose speed. They install Multiplexers so they can put more phone lines on fewer phone wires, and your speed suffers.

Line Noise

If the characters that appear on the screen after you connect are ALL illegible, then the following does NOT apply. If Some parts of words are readable, or you have trouble downloading (CRC errors), then the following probably is the problem, especially if it is worse at higher speeds. It may stop altogether at lower speeds. Line noise may also be the cause of FAX or 56K not connecting (or random spots on faxes).

Commonly called line noise, problems with downloading or the spurious characters or garbage that appear on the screen are usually from the central office of the phone company. It can make a big difference whether you call Out or someone calls In. Also there is a difference between calling different areas (area codes or exchanges) as different equipment will be involved. Calling the phone company will rarely do any good, because the problem is not on your line. It is also much more likely to happen on local connections than long distance. Older cities are more likely to have problems.

For more information on line noise and possible cures check the following web pages.

(the following two references have not been found to be live but they are in the email from Zoom)

NOTE: ZOOM cannot and does not endorse or recommend any circuits on those pages. You use them at your own risk. I provided those Web addresses for informational purposes only.

(The only commercial device I ever tested that claimed to stop noise, cost more than $45 and did nothing at all).

Don Hinds - Zoom Tech

Ps. My 56K modem would not connect at all from my home (2.5 blocks from Telco Bldg) until I made and used one of those ‘filters’.


The following is from a junior tech

Use AT&FS202=32S95=1&C1&D2 as the initialization string.

Here are some other suggestions This should help you troubleshoot K56 FLEX connect problems....

1 You need to check your modems ROM revision, you may use the ati3 command in any Communication software to do so. (eg.ComitW/Procomm/HyperTerminal)

You also need to check what version your ISP is using. ROM updates for the Zoom Internal and External modem is currently posted at...

2 There's a alternative list of K56Flex providers posted on our Website at have you tried connected to any of these numbers.?

3 Have you been able to connect to any K56Flex service at 33.6+ speeds.?

4 You may also use the modem +MS register (see p.49 in Owners Manual) to force Protocol and Min/Max speed like so....

AT&F&C1&D3&K3S202=32+MS=56,1,40000,56000S95=1 REMEMBER!! Init Strings for Internet are inserted under Dial-Up-Nets "Extra Settings" dialog box.

5 It's usually easier to use HyperTerminal or a Terminal Window under Dial- Up-Networking to dial your ISP's access number like so...


the advantage is that with S95=44 in your string the modem will report all speeds and Protocols including Carrier speed.

Dial-Up-Net may report Connect (DTE) speed which is a software compression setting, much more important is Carrier (DCE) speed, you may need to
try the following...

1 Include S95=44 and/or W1 in your string under "Extra Settings'.
2 Use a "Terminal Windows" to dial under Dial-Up-Networking.
3 Under DUN check "Record to Logfile" and see contents of modemlog.txt
Zoom Technical Support

PS: Please try the above BEFORE attempting a ROM update, I also need the modem ati3 command response and your ISP's Access Number. This could be a line-noise problem.

USRobotics Setup String

This tip comes from DELL computer for the factory installed USRobotics win modems. "USRobotics recommends the following setup string for their "WinModem" (sportster series).
AT&F1&K0&I0 S33=32 S15=128 S27=64. Those are zero's not o's."
REMEMBER!! Init Strings for modems are inserted under Dial-Up-Nets "Extra Settings" dialog box.

Test Your Phone Line

USRobotics has a phone line to test your modem against. It was designed for their modems against their modems but, why not try it. 1-888-877-9248, user name is Line Test. You'll get information that you never thought you needed and then some!

Practical 56K Flex recommendations

Init Strings for Common Applications

Many software applications that use your modem must have an init string. An init string is what tells your modem how to act. Every software application will require certain things of your modem. The init string is what tells your modem to act in a certain manner. For most applications, your software application will have a modem pick list. In those cases, you can select your specific modem from the list. If your modem is not listed, then you can select on that is most compatible to your modem.

If you have an internal modem but your software only lists the external version, you can select that as your modem choice. The internal modems and the external modems should use the same init string. If your software does not list any choice that works with your modem, you can also try using Hayes Compatible setting.

If your software does not have a modem pick list, in most cases you can use the default init string of AT&F&C1&D2. That resets your modem to factory settings and configures it for optimum usage under most circumstances.

If this still does not work, you would want to contact the software manufacturer for the requirements of their application. They would be able to tell you what their software requires from the modem. Knowing these requirements, we can then assist you with tailoring your init string to fit your software's requirements.

THe following is a listing of init strings for some of the most commonly used applications.


America Online AT&F&C1&D2&K3&Q5E1V1Q0X4^M
COMIT for Windows AT&F&C1&D2S95=44
COMMUTE AT&F&C1&D2E0V0W0S7=90S95=0
Doom AT&F&C1&D2&Q6S37=9
Fax STF for theMac AT&F&C1&D0&K4E0S11=55
FXTerm AT&F&C1&D2S0=0
NavCIS AT&F&C1&D2M1V1W2X4&Q9S11=50
PC Anywhere AT&F&C1&D2E0S95=42S0=0W1
Procomm Plus AT&F&C1&D2
QModem Pro for DOS AT&F&C1&D2^M
QModem Pro for Windows AT&F&C1&D2^M
Quick Link II Fax AT&F&C1&D2S0=0
Telix for DOS AT&F&C1&D2S0=0^M
Telix for Windows AT&F&C1&D2S0=0^M
Telemate for DOS AT&F&C1&D2S0=0^M
WinFax Pro 4.0 Class 1 - AT&F&C1&D2S7=90\
Class 2 - AT&F&C1&D2S7=90&K4\

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