Is this product compatible with an older PC (with the proper adapters) - DB9 serial port & IBM/AT Keyboard connectors?

There is not a DB9 serial port. There are four cables with one USB, one PS/2, and one DB15-HD video connector for each switched computer port.

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TRENDnet;TK-423K;TK-403KR / TK-423K KVM General Quick Reference Sheet

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TRENDnet TK-423K 4-Port USB PS/2 Audio KVM Switch Kit

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4 Ports Computer Connections
1 Port Monitor Connections
Video Resolution 2048 x 1536

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Manage 4 computers that have open VGA and PS/2 ports at the touch of a button with one set of PS/2 or USB keyboard and mouse, VGA monitor, microphone and speakers.

No need for additional cabling, all required cables are included. Independent audio/mic and PC port selection provide additional flexibility. LED indicators show connection status and a buzzing sound confirms port switching. With Hot-Plug, Auto-Scan and Hot-Key operating features, this versatile device is the perfect choice for managing 4 computers/servers.

The 4-Port USB PS/2 KVM Switch Kit with Audio (TK-423K) provides control of 4 computers/servers with just one set of console controls. Manage 4 computers that have open VGA and PS/2 ports at the touch of a button with one set of PS/2 or USB keyboard and mouse, VGA monitor, microphone and speakers. No need for additional cabling, all required cables are included. Independent audio/mic and PC port selection provide additional flexibility. LED indicators show connection status and a buzzing sound confirms port switching. With Hot-Plug, Auto-Scan and Hot-Key operating features, this versatile device is the perfect choice for managing 4 computers/servers.

Unified ControlShare one keyboard, mouse, monitor and audio devices between four computers using the TRENDnet TK-423K. The built-in VGA connector supports monitors with resolutions of up to 2048 x 1536.
Easy Switch between PCsEasily switch from a computer to another by using the keyboard hotkeys or hardware push button.
AutoScanWith the Autoscan function, the TRENDnet TK-423K KVM switch automatically switches among four computers for operation-free computer monitoring.

Type	D-Sub, USB, PS/2
PC Connectors	4 x USB type B 4 x VGA HDB 15-pin female 4 x 3.5mm audio in/out jack 4 x 3.5mm microphone in/out jack
Console Connectors	2 x USB 1.1 type A for keyboard/ mouse 1 x PS/2 keyboard 6-pin mini DIN female 1 x PS/2 mouse 6 pin mini DIN female 1 x VGA HDB 15 pin female 1 x 3.5mm audio in/out jack 1 x 3.5mm microphone in/out jack
Computer Connections	4 Ports
Monitor Connections	1 Port
Video Resolution	2048 x 1536
PC Selection	Push Buttons/Hot Keys

Temperature	0ºC to 40ºC(32ºF to 104ºF)
Humidity	0% to 90%,Non-Condensing

Power Features	9V DC 1A external power adapter
USB Features	with USB support
Features	Manage up to 4 computers/servers with one set of console devices All required cabling included Cables from the KVM switch to the computers/servers feature VGA and PS/2 connectors Supported console connections are as follows: PS/2 or USB keyboard and mouse ports, VGA monitor port and speaker/mic port Audio and microphone support Audio/mic port selection may be independent of keyboard, video and mouse port selection Control computer/server selection with front push buttons and keyboard hotkeys Supports Universal Host and Open Host Controller Interface (UHCI/OHCI) Multiple platforms supported: Windows 98, XP, Vista, Mac, Linux and more Port switching confirmed by LED status indicators and audio tone High quality VGA resolution up to 2048 x 1536

TRENDnet TK-423K 4-Port USB PS/2 Audio KVM Switch Kit

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Model
Brand	TRENDnet
Model	TK-423K

Item#: N82E16817403066

TRENDnet TK-423K 4-Port USB PS/2 Audio KVM Switch Kit

Learn more about the TRENDnet TK-423K

Customer Reviews of the TRENDnet TK-423K

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info