E. ZT 8907 Vs. ZT 8902: Technical Differences
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ZT 8907 PROGRAMMING ISSUES
In most cases, ZT 8902 applications that do not program any VLSI chipset registers or
flash memory ports directly will not require modification in order to run on the ZT 8907.
Unchanged configurable items include:
•
The COM1, COM2, Digital I/O, and Timer/Counters peripherals are in the same I/O
locations on both boards.
•
The available interrupt routing selections are the same on both boards.
•
Software configuration of interrupt routing (via the BIOS SETUP utility) is similar on
both boards.
Device and/or mapping differences on the ZT 8907 include:
•
Chipset: Acer Labs (ALi) FINALi Chipset (M1489/M1487) 486 PCI chipset
•
Flash memory: Up to two 2 Mbyte AMD or Intel flash devices may be factory
installed. Flash memory is mapped in one contiguous block
accessible from
FFC00000h - FFFFFFFFh (if 4 Mbytes are installed). Of this, the BIOS occupies
ranges FFFFF000h - FFFFFFFFh (top 64 Kbytes) and FFEE0000h - FFF00000h.
•
I/O Map Changes: There are some differences between the ZT 8902 and ZT 8907
I/O maps. Compare the I/O maps in the respective manuals to learn these
differences.
ZT 260 AND ZT 310 ENCLOSURES
Listed below are the new options added to the ZT 2502 and ZT 2503 front plates to
support the ZT 8907 video/keyboard connector.
•
ZT 2502-V8: System Plate for ZT 8907 (single CPU system)
•
ZT 2502-V9: System Plate for multiple ZT 8907s in a STAR SYSTEM
•
ZT 2503-V8: Video/Keyboard Access Plate for a single ZT 8907 (STAR SYSTEM
temporary master)
•
ZT 2503-V9: Video/Keyboard Access Plate for multiple ZT 8907s in a STAR
SYSTEM