Intermec 6640 Technical Reference page 31

SECTION 2
Primary Slave:
"
(Submenu press [Enter] to access.)
Hard Disk Type
Press the [Esc] key or tap the Exit Submenu"
item to return to the Main" menu.
Memory Cache:
"
(default)
Boot time Diagnostic Screen:
"
Primary Slave
6640 Mobile Computer Technical Reference
CMOS Setup
2-5