This is anIntel InBoard 386/PC ISA Card BUNDLE w/ 80387 Math Coprocessor & Cable that has been tested and works.
If you are a serious vintage IBM collector looking to max out a legendary IBM PC (5150) or IBM XT (5160), this is the absolute ultimate upgrade kit. This iconic Intel InBoard 386/PC 8-bit ISA board allows an original 8088/8086 system to run lightning-fast 16MHz 386 software.
THE ULTIMATE TRIPLE-ACCELERATOR BUNDLE INCLUDES:

• The Intel InBoard 386/PC Board is Populated with 1MB of onboard 32-bit high-speed RAM.

• Pre-Installed Intel 80387 FPU: Optional math coprocessor chip pre-installed on the board for elite hardware-accelerated calculations.

• The Proprietary Motherboard Ribbon Interface Cable: The rarest piece of the puzzle! All connector pins are perfectly straight, ensuring clean structural contact. The ribbon fabric shows light, minor cosmetic jacket wear from age but is fully intact with no structural tears, no exposed wire, and 100% verified signal integrity.

PROOF-OF-LIFE PERFORMANCE STATUS:

• Flawless POST & Diagnostics: Meticulously benchmarked and tested. Passes diagnostics seamlessly.

• Operating System Verified: Boots directly into MS-DOS with zero errors.

• Driver Initialization: Drivers fully load, detecting both the upgraded 386 architecture and the 80387 math coprocessor extension perfectly.

MULTI-MEDIA DRIVER COMPLEMENT:

• Drivers will be included on 360k disks, a 720k disk, and a USB drive which has a PDF of the instruction manual on it.

ABOUT THE SELLER:

• I specialize in the restoration, maintenance, and curation of authentic vintage IBM 5150 and 5160 systems. This Intel InBoard was pulled directly from a preserved IBM computer under my care. It has been tested by a vintage hardware specialist using period-correct testing frameworks—not a casual reseller. Buy with absolute confidence.

Free shipping with insurance and signature confirmation within the United States.