Controllerless V.90/K56flex ISA Modem Chipsets
Usage: To find other modems with the same chipset.
All drivers, downloads & info on this site are found via the modem.
Each Modem Manufacturers’ page also has external web-links, where available.
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General Information
- This chipset type was started by AT&T, although the chipset itself was originated by Lucent & continued under the Mars Families by Agere. Modem controller functions (AT-commands, etc.) have been taken out of the modem and processed in software on the host-computer. DSP functions are still in silicon in the modem. This reduces the demand on the computer’s CPU (not so important these days) and also makes it easier to move to other OSs from the original Windows host-OS.
The 1641B DSP has PnP functionality on-chip, whilst the 1641 DSP does not, and requires an extra IC.
It is an immensely popular modem chipset (I’ve got one with a Mars chipset)--there are, therefore, a vast number of variations on the same theme. This can be very confusing, but the good news is that most Lucent Win Modem drivers will work with most Lucent Win Modems, regardless of the variation. To check your precise variant requires a knowledge of the DSP chip number.
(Note beforehand: the v5.48 driver notes--sent by Lucent to chipset manufacturers--point out that K56flex & V.90 will “work only on the CH ROM codes; this is a run time check option”. This means, as one example, that the Luna 1641-CC DSP modem can be upgraded by a 56k driver but will only actually operate at 33.6k or lower, whilst the Luna 1641B-CH DSP modem will work at V.90.)
DSP Chipset Name
1641-CC - Luna 56k ISA (this Family)
1641B-CH - Luna 56k ISA PnP (this Family)
1642C - Apollo 33.6k ISA
1643-CC - Apollo 56k ISA
1644-CH - Apollo 56k ISA PnP (this Family)
1645 - Mars 56k PCI
1646 - Mars2 56k PCI
1648 - Mars3 56k PCI
1648B - Mars3 56k PCI
1648C - Mars3.2 V.92 PCI
If a driver older than v5.44 is updated there will be a name-change, and the connection software will not find the driver anymore. Windows’ users can fix this on the Properties sheet of DialUp-Networking (DUN) - look under the File menu when the DUN entry is highlighted.
Lucent retained the AT&T PCI ID when it was spun off from Bell Labs, hence the MFC name.
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Compilation, original writings & design Copyright ©2002 - 2008 Modem-Help, Ltd.
All trademarks respected as the property of their respective owners.
Full Copyright + Disclaimer statement
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Quick Stats
Items available:
- 11,177 modems
- 1,455 chipsets
- 2,036 chips
- 735 modem mfcs
- 118 comp/MB mfcs
- 1,654 comps/MBs/retail
- 139 chipset mfcs
- 15,356 external web links
- 82,371 hardware IDs
- 110,929 download files
† Key
Mfc: the company no longer makes/supplies modems and/or their chipsets, or has been taken over, or otherwise fallen into commercial Tophet.
Modem: it is no longer in production.
Chip, Chipset, Family or Family-Type: it is no longer produced at the Foundry.
In short, the item marked with a † has shuffled off this mortal coil, it has gone to meet it’s maker, to sing with the choir invisible; it is, not to put too fine a point upon it, an ex-modem (-Mfc, -Chip, -Chipset, -Family or -Type).
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