If memory is installed on the Blizzard 1230-II you can load Kickstart into the faster RAM to speed up the execution of operating system functions. If the MAPROM jumper is removed, Kickstart will be automatically copied over to the RAM. If the jumper is installed Kickstart will be executed on the ROM.

RAM-Speed

Memory access can be improved for 60ns memory modules by setting this jumper. If the optional SCSI Kit is attaches, this jumper must not be set.