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E. ZT 8907 VS. ZT 8902: TECHNICAL DIFFERENCES
This section describes the technical differences between the ZT 8907 and the ZT 8902
single board computers. It includes information to help existing ZT 8902 customers
adapt their applications to the ZT 8907.
ZT 8907 NEW FEATURES
As shown in the list below, the ZT 8907 incorporates new features that are
improvements over the ZT 8902 design.
•
Software configuration of interrupt routing options via screen 2 of the BIOS SETUP
utility.
•
A 128 Kbyte battery-backed SRAM module is available on the ZT 8907. This SRAM
can be paged into the memory map (real mode) as a location to save critical data
without having to write to flash memory.
•
A flash memory "write-protect" jumper (W9) physically gates the write line to the
flash memory device(s).
•
The ZT 8907 uses industry standard 72-pin SO-DIMM DRAM modules (commonly
implemented on laptop computers). Modules may be purchased in 4, 8, or 16 Mbyte
sizes allowing for 4 Mbytes minimum and 32 Mbytes maximum onboard memory
capacity.
•
An integrated 1.4 Gbyte IDE drive can be mounted to an optional onboard IDE
interface on the back of the ZT 8907. Option D1 to the ZT 8907 includes a hard disk,
cable, and connector. When configured for local IDE operation, the ZT 8907 requires
one additional slot in the STD 32 card cage.
ZT 8907 MECHANICAL ISSUES
The ZT 8907 was designed to minimize the amount of system redesign necessary for
existing ZT 8902 applications. The ZT 8907's frontplane connectors were designed to
be compatible (mechanically and pin-to-pin) with those on the ZT 8902 board. The
"
ZT 8907 / ZT 8902 Connector Cross Reference
" table presents the connector
designations on each board.
Due to chipset differences between the ZT 8902 and ZT 8907, the ZT 8907 does not
support the "local bus" style mezzanine boards (zVID1 and zVID2). Instead, the
ZT 8907 implements a local PCI mezzanine connector (J13) to accommodate Ziatech
PCI mezzanine video boards (zPM11, zPM12). J13 provides a complete 32-bit PCI
interface. In addition to offering substantially increased performance over STD bus
video, both "local bus" (ZT 8902) and PCI bus video solutions (ZT 8907) have the