Tyan Computer InterServe 90 - Manual (Page 2)

Errata
The System Board Manual from the manufacturer of the system board
reflects a wrong jumper setting for dual-floppy operation. In this
manual, jumper JP4 is listed as being open for dual-floppy support.
The correct setting is as follows:
JP4 Pins 1-2
Dual-floppy support Closed
Single-floppy support Open