What are these weird long ISA slots on this 386 board?

I have managed to figure out that the bottom row of pins in the EISA riser card slot are for the 2 PCI bus card + 3 ISA breakout board

Table 4 11: PCI Connector Pinout 5V System Environment slot is located such that dedicated ISA, EISA, or MC slots are

isa expansion slot Connector Pinouts ISA Connector Component Side A1: *CHKCHK B1: GND A2: SD7 Note that IRQ13 is not present on the ISA bus connector

isa slot uses Table of Contents · ISA Overview · ISA Documents · ISA Signal Descriptions · ISA Timing Diagrams · ISA Signal Usage · ISA Connector Pinout