During the late 1980s, INTEL sold two ISA expansion cards named Intel Inboard 386/AT and Intel Inboard 386/PC / This is the PC XT Version which allowed users to upgrade an IBM XT (or compatible) respectively. The boards allowed users to upgrade their machines' CPU to a 16 MHz 80386 processor. Both variants utilized a ribbon cable which plugged into the computer's original CPU socket on one end and into a socket on the Inboard card on the other end.

Both boards were full-length ISA expansion cards and occupied one slot. Each card came with 1MB of onboard memory as standard, included an 80386 processor, and included a socket for an 387 math co processor. Originally, the Intel 386/XT Board with 1MB of memory sold for US$1,995.00 !! Later into the lifespan of the Inboard, Intel began offering 2 MB and 4 MB memory expansion daughter cards.

Both boards utilized DOS drivers to configure the onboard memory. Without these drivers, the boards would still function, but the onboard memory could only be used as conventional, and not as extended or expanded. The Intel Inboard DOS drivers could also be configured to "slow down" system performance by adding memory wait states, thus alleviating compatibility issues.