Asus P3C-D Motherboard Modem Riser Driver for Windows 2000

License: Freeware / Date Added: Mar 2008 / Operating Systems: Windows 2000/XP / File Size: 1.97 MB / Publisher: Asus

This file lists the main functional enhancements, additions, and bug fixes for the different versions of the SM56 AC-L Modem.

Known Incompatibilities

• Crystal Clock Accuracy
Proper modem operation requires the 24.576 MHz crystal clock frequency to be accurate to +/-50ppm (0.005%) or better. This crystal is located on the modem riser board if it is configured as a primary codec on the AC-Link. If it is configured as a secondary codec on the AC-Link, the modem clock is derived from the AC-Link BIT_CLK signal. In this case, the crystal drives the AC '97 audio codec (which is either down on the motherboard or on the riser board if it is a true AMR combo card).

• Modem I/O Base Address
Make sure the AC-Link modem I/O base address is aligned on a 100 hex boundary after installation. Earlier versions of the AC-Link silicon and BIOS's did not ensure this automatically. Release versions of the motherboards should enforce this at install time. You can check the I/O base address of the modem via the Modem Resources tab in Device Manager. The I/O base address must be xx00.

• Intel 440MX Mobile Systems
If you freshly install or re-install Win 9x on 440MX mobile platforms, especially if using 440MX silicon earlier than Rev. B0, the PnP subsystem will not detect the presence AC-Link peripherals. The reason is that PCI device enumeration defaults to "Use Hardware". You must go into the Device Manager, double click System Devices, then double click PCI bus. In the PCI bus Properties window select the Settings tab and select "Use BIOS" under the Device Enumeration box. Now restart the PC.

• Power Management and TAPI Applications
Some communication applications that use Window's Telephony Application Programming Interface (TAPI) function calls may experience problems when the computer goes into standby/suspend mode. One example of this is Hyperterminal, supplied with Windows. Testing with various internal soft, controllerless, and DSP based hardware modems has shown that with the application open (communicating with the modem), after the PC returns from suspend/standby state, the application can no longer communicate with the modem. Closing and re-opening the application restores the modem communication link. While various issues are still being investigated, the problem source points to the TAPI layer in Windows. When the PC goes to sleep, somehow the device thread gets severed and not restored on waking. The OS does not signal this to the application layer, which is why the application thinks it can still communicate with the modem...but it cannot. This problem has been reproduced with various modems from various vendors. It is not specific to the SM56 AC-L. It is also erratic, in that sometimes the communication link with the modem stays up after the PC wakes up.

• Wake On Ring (WOR)
All the code is in the SM56 AC-L modem to support wake on ring. For WOR to function you must make sure you have a BIOS that fully and correctly supports it, as well as making sure the feature is turned on in the BIOS and in the OS. If all system components do not fully support WOR, it will not work.

Build by Build Details

• Build 80 August 20, 1999:
1. Added ATI8 response key to Registry. ATI8 response can now be tailored via the INF file. It defaults to ERROR.
2. Enhanced Uninstall to remove ALL modem components from the system, including INF files and Registry keys.
3. Fixed some DTMF levels for Singapore, as well as some country settings for Malaysia and Australia.
4. Can now abort pulse dialing (ATDP).
5. Fixed an array problem in the DSP code which could be encountered when dialing some headend.

• Build 79.1 August 12, 1999:
1. Fix to driver to pass MCT2000 testing.
2. Fix to INF to pass CINF for PC 99 Microsoft Logo testing.

• Build 79 August 5, 1999:
1. Added Traditional Chinese help file.
2. Added automatic reboot during upgrade procedure.
3. The device status window in the SM56 Modem helper application is now functional.
4. The display for the COM port selection has been removed from the SM56 Modem helper application. No need to manually force COM ports on Windows 2000.

• Build 78 July 16, 1999:
1. Added country support for New Zealand and Mexico.

• Build 76 June 30, 1999: 1. Fixed international tone detect problem.

• Build 75 June 16, 1999:
1. Allow loop current dropout during the initial 1.5 seconds for CTR21.
2. Check for MOT device ID and refuse to load if not matched.

• Build 74 May 28, 1999:
1. Fixed some international call progress issues for Malaysia, Singapore and France. A "busy" response was not obtained for Malaysia or Singapore during the International Call Progress. International Call Progress for France would not detect ring.

• Build 73 May 25, 1999:
1. Fixed a problem with modem install on Windows 95.
2. Fixed a DTMF level problem for CTR-21.

• Build 72 May 24, 1999:
1. First version of the drivers.

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Asus P3C-D Motherboard Modem Riser Driver for Windows 2000

License: Freeware / Date Added: Mar 2008 / Operating Systems: Windows 2000/XP / File Size: 1.97 MB / Publisher: Asus

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