Pci\ven_1c00&dev_3253&cc_070005 May 2026

The MCS3253 is a specific part number from MosChip (pre-ASIX acquisition). Later ASIX equivalents: (PCIe to multi-I/O, software compatible).

After checking up-to-date PCI ID repositories: → Asix Electronics Corporation (formerly MosChip Semiconductor). Asix acquired MosChip's PCIe/PCI I/O controller line. Thus, the actual vendor is ASIX Electronics / MosChip . 3. Device Identification (DEV_3253) DEV_3253 corresponds to: pci\ven_1c00&dev_3253&cc_070005

The ID 1C00 is sometimes attributed to or listed as "Reserved / Vendor-defined" in older PCI databases, but actual hardware with this ID overwhelmingly points to PCIe to multi-I/O controllers from MosChip (now Asix Electronics) or Netmos designs. The MCS3253 is a specific part number from

| 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 acquired MosChip's PCIe/PCI I/O controller line

| Vendor | Details | |--------|---------| | (or Silan Integrated Circuit Co., Ltd.) | A Chinese semiconductor company. However, this specific vendor ID is also widely reused by PLX Technology (now part of Broadcom) for bridge devices, and by various third-party PCIe-to-serial/parallel bridge chips under the MCS (MosChip Semiconductor) or Oxford Semiconductor families. |