Compaq Portable II - Page 104

Table 8-7. Multipurpose Fixed Disk Drive Controller Boards Switch and Jumper
Settings (Assy Nos. 000519 and 000815)
==============================================================================
Switch Setting Function
------------------------------------------------------------------------------
SW500-1 OFF Primary diskette and fixed disk drive address select
(default)
ON Secondary diskette and fixed disk drive address select
SW500-2 OFF Disable high speed transfer rates for systems without
1.2 megabyte diskette drive
ON Enable high speed transfer rates for systems with
1.2 megabyte diskette drive (default)
SW500-3 OFF Enable fixed disk drive (default)
ON Disable fixed disk drive
SW500-4 OFF Serial interface COM1 IRQ4 (default)
ON Serial interface COM2 IRQ3
SW500-5 OFF Enable serial interface (default)
ON Disable serial interface
SW500-6 OFF Enable printer interface (default)
ON Disable printer interface
==============================================================================