Diskette Drive Subsystem; Cd-Rom Module; Dvd-Rom Module - Compaq Armada e500 Series Reference Manual

Diskette Drive Subsystem

The diskette drive is a 3.5-inch form factor, 11 millimeter high, 1.44-megabyte
(formatted), AT-compatible drive. Selected for its extreme small size and weight, low
power operation, and high shock resistance, the drive is capable of reading and writing
720 K (formatted) diskettes to maintain backward compatibility. Refer to the
manufacturer's specification for more details.
The diskette drive is packaged in a module form for insertion into the Dualbay on the
front of the Armada E500. The Armada V300 has a fixed diskette drive in the same
location.
The diskette controller is software compatible with the Intel 82077 controller and is
integrated into the MSIO Super I/O device. The controller is clocked by a 14.318-MHz
clock and supports transfer rates of 125, 250, 300, 500, and 1000 kilobits/second.
The power-down mode is controlled by the issuance of the automatic power-down mode
command to the diskette controller. The command's argument specifies what the
minimum power-on time is before the device attempts to enter the power down mode
(the system BIOS programs this timeout to be 0.5 second). The criteria for automatically
entering power down mode are:
All motor enables are inactive
INT output is low
The device is idle (as signified by the IDLE output being high)
If, after the BIOS issues the auto-power-down command, the above criteria are met,
then 500 milliseconds later the diskette controller enters power-down mode. If the
criteria are not satisfied when the power-down timer expires, the diskette controller
postpones the process until the criteria are met.
When power-down mode is successfully entered, the PD output goes active high, and
the FDC tri-states its diskette drive interface. The IDLE pin continues to be high after
power-down mode is entered. The internal crystal oscillator cannot be disabled in
power-down mode due to the long time necessary for stabilization of the oscillator
output on a restart.

CD-ROM Module

The minimum speed of the CD-ROM drive module is 24X. The CD-ROM mates to the
68-pin MultiBay connector on the both computer series.

DVD-ROM Module

The minimum speed of the DVD-ROM drive module is 4X. The DVD-ROM mates to
the 68-pin MultiBay connector on the Armada E500 computer.
Mass Storage 10-3