Table of Contents
Advertisement
the data immediately, the ACB-232XD will pull it off the disk into the buffer, ready
for transfer at Read-Ahead speed when the CPU comes back.
*
Read-ahead. Special algorithms take in data before it is requested and store it,
ready for lightning-fast data transfers. Up to 1.9 MByte/sec recorded on Coretest!
Provides optimum performance with UNIX/XENIX.
*
Multi-track read-Ahead. The ACB-232XD does not stop at the track boundary, but
continues to read-ahead until the buffer is full. With its 64K buffer, the ACB-232XD
can pre-fetch up to four full tracks.
*
Optional on-board Adaptec ACB-BIOS. This provides the most functionality of any
AT controller. The copyrighted ACB-BIOS contains the low level format, defect
management, data verification, autoconfiguration of any drive without changing AT
system BIOS.
*
ACB-BIOS low-level primary format. This provides the ability on the controller to
format the drive without the need of system diagnostics or changing the AT system
BIOS.
*
ACB-BIOS ability to read ESDI drive parameters.
characteristics directly from the drive, reducing the possibility of using the wrong
number of heads, cylinders, sectors, etc.
*
ACB-BIOS ability to read ESDI manufacturer's defect list. This reads the
manufacturer's flagged bad areas on the disk, eliminating the need to enter them
manually.
*
ACB-BIOS ability to add grown defects, save and protect all defect lists. This
gives the ability to run additional defect tests and add the defects to those the
manufacturer found. Also the controller saves and protects both the manufacturer's
and grown lists from accidental erasure, thus the highest data reliability.
*
ACB-BIOS sector -level defect mapping. This flags a sector on the disk to be
unusable and reports to the operating system its location, giving system level data
integrity.
*
ACB-BIOS dynamic skewing. The BIOS determines the optimum head skew for
the low-level format. This means less time lost during head switching.
*
ACB-BIOS data verification using worst case data patterns. This tests the disk with
the worst possible combinations of data before valuable user data is placed on the
disk. This provides the highest data reliability.
*
ACB-BIOS autoconfiguration of any ESDI drive, not in AT system BIOS. This
allows any ESDI drive to be formatted and used without changing the AT system
BIOS drive tables. This simplifies the cumbersome task of changing EPROM drive
tables to add ESDI. The controller writes the drive parameters onto the drive
during format and reads them on power up. This is ideal for field upgrades since
the controller does not need to be hardware configured to the specific drive. This
achieves the highest drive flexibility possible.
*
Shadow RAM.
location. This enhances compatibility with VGA and all major software programs.
*
ACB-BIOS defaults and help messages. Default entries help speed the user
through an installation. If an error occurs, help messages come up to tell the user
(http://www.franken-online.de/ymmv)
ACB-232XD User's Manual
The auto configuration drive tables are stored in a protected
This reads the drive
Page 3 of 26
Advertisement
Table of Contents
