Keyspan USA-28X B USB Twin Serial Adapter Mac Vintage Retro Apple Hardware Clean For Sale

Keyspan USA-28X B USB Twin Serial Adapter Mac Vintage Retro Apple Hardware Clean
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.

Buy Now

Keyspan USA-28X B USB Twin Serial Adapter Mac Vintage Retro Apple Hardware Clean:
$54.99

Condition Note: Untested but in excellent visual condition. Unit was acquired secondhand and has not been hooked up to a vintage system, but the physical ports and pins are completely pristine as shown in the photos.Product Overview:
Up for sale is a vintage Keyspan USB Twin Serial Adapter (Model USA-28X B). This classic piece of legacy hardware allows modern USB-equipped vintage computers—such as the clear translucent Apple iMac G3, G4, or PowerMac lines running Mac OS 8 or 9—to interface seamlessly with older, classic serial devices like Macintosh-compatible printers, modems, and graphics input tablets. Condition & Quality Details:
• Cosmetics: Excellent, clean pre-owned aesthetic condition. The translucent "frost" plastic casing is clear, unclouded, and free of cracks or major scuffs.
• Hardware Interface: Both 8-pin Mini-DIN round serial ports are completely pristine. All internal metal connection pins are perfectly straight, clean, and undamaged.
• Cable Integrity: The integrated clear USB-A cable is fully intact, flexible, and free of any fraying, rubber splits, or stickiness. Item is sold exactly as shown in the high-definition listing photos. Perfect, plug-and-play addition for retro-computing hobbyists, tech vintage collectors, or legacy hardware setups! Shipped fast and secure.
Buy Now

Documentation