3.3
EIDE/ATAPI Interface
The VP7 offers one EIDE/ATAPI Interfaces. The device is logically connected to the primary PCI bus.
Therefore a high data transfer rate is achievable. The signals of the EIDE interface are available at the
connector P1800.
The registers used for the primary EIDE interface are I/O-mapped as shown below
Address
Name
Function
$01F0
Data Register
Read/Write
$01F1
Error Register
Read only
$01F1
Write Command Register
Write only
$01F2
Sector Count Register
Read/Write
$01F3
Sector Number Register
Read/Write
$01F4
Cylinder Number Register LSB
Read/Write
$01F5
Cylinder Number Register MSB
Read/Write
$01F6
Drive Head Register
Read/Write
$01F7
Status Register
Read only
$03F6
Fixed Disk Register
Write only
$03F7
Digital Input Register Def.
Read only
The VP7 System BIOS automatically detects a connected EIDE HDD or flash disk and enters the
corresponding drive parameters into the BIOS setup. This feature allows faster and easier handling of
varying types of EIDE hard disks. At the EIDE interface two hard disks can be connected. In this case
one HDD must be configured as master and the other one as slave. Read the hard disk manual to find out
where these jumpers are located on your drive. The optional flash disk is connected to an EIDE
connector too.
Using EIDE and SCSI devices.
MS-DOS 6.22 can handle up to seven hard disks. The PC allows the simultaneous use of EIDE and
SCSI hard disks. In BIOS setup, you can select whether to boot from the first EIDE or the first SCSI
device.
For correct operation of the EIDE interface, a maximum cable length of 8 inch (20 cm) must
not be exceeded.
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