Pci\ven_1c00&dev_3253&cc_070005 Jun 2026

| Field | Value | |-------|-------| | | MosChip MCS3253 / ASIX AX99100? (or similar) | | Chip family | PCIe to dual UART + parallel port controller | | Function | Adds legacy I/O: 2 x RS-232 serial ports + 1 x IEEE1284 parallel port |

→ Asix Electronics Corporation (formerly MosChip Semiconductor). Asix acquired MosChip's PCIe/PCI I/O controller line. pci\ven_1c00&dev_3253&cc_070005

corresponds to:

This is a "Controller-less" modem. The hardware (identified by DEV_3253 ) handles the physical telephone line interface (DAA) and basic control functions, but the modulation/demodulation tasks (converting digital data to analog signals) are offloaded to the computer's CPU via the driver software. | Field | Value | |-------|-------| | |

Better interpretation: Many PCI databases show = "Parallel port (IEEE1284) + 16550-compatible serial ports" combined into one class code, treated as a “Multi-I/O controller”. corresponds to: This is a "Controller-less" modem

The CC_070005 class code indicates that this modem operates on the Intel High Definition Audio (HDA) bus specification. Unlike older "winmodems" that utilized proprietary AMR (Audio Modem Riser) slots, this device integrates into the system's HD Audio controller.