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Multi-I/O Two Serial One Parallel ISA card
Price: $28.88

Add Serial and Parallel Ports to your ISA bus
PCI 2-Port RS232 Serial Adapter Card
Price: $34.88

Add 2 high-speed RS-232 serial ports to your PC through a PCI expansion slot
PCI Express PCIe 2-Port RS232 Serial Adapter Card
Price: $34.88

Add 2 high-speed RS-232 serial ports to your PC through a PCI Express expansion slot
2 Port ISA RS232 Serial Adapter Card with 16550 UART
Price: $38.55

2 Port ISA Serial Adapter Card
PCI Express PCIe 2-Port RS232 Serial and 1-Port Parallel Adapter Card
Price: $39.88

Add serial and Parallel ports to your PC through a PCI Express expansion slot
PCI 4-Port RS232 Serial Adapter Card with 16C550 UART
Price: $64.88

4 x 9-pin DB09 Male RS-232 Serial Ports
4 Port RS232 Mini PCI Express Serial Card w/ 16650 UART
Price: $99.96

Mini PCI Express - 4 x DB-9 Male RS-232 Serial - Full-length Plug-in Card
SIIG USB to 4-Port Serial Adpater
Price: $105.99

4 x 9-pin DB-9 RS-232 Serial
Lava Computer QUATTRO-PCIE Serial Adapter
Price: $125.25

4 x 9-pin DB-9 RS-232 Serial PCI Express
4 Port PCI Express PCIe Serial Combo Card - 2 x RS232 2 x RS422 / RS485
Price: $131.88

PCI Express x1 - 4 x DB-9 Male RS-232/422/485 Serial Via Cable - Plug-in Card