80386Sx Or 486Slc/E Central Processing Unit (Cpu); Dram; Floppy Drive Controller; Hard Drive Controller - Xycom XVME-678 Manual

Chapter
1 -
Introduction
1.3.1 80386SX or 486SLC/e Central Processing Unit (CPU)
The XVME-688 uses an 80386SX microprocessor to provide operational capabilities. The XVME-678
uses a Cyrix 486SLC/e that provides a 486SX-compatible instruction set with a 1 Kbyte internal cache.
These 25 MHz CPUs can access up to 16 Mbytes of DRAM.
1.3.2
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The XVME-678/688 uses Dynamic Random Access Memory (DRAM) configured in a page interleave
mode with 0 wait-state operation. The 1, 4, and 16 Mbyte versions of the XVME-678/688 are two-way
interleaved, while the 2 and 10 Mbyte versions have no interleaving.
The XVME-678/688 comes factory-configured with 0, 1, or 4 Mbytes of DRAM. Additional DRAM can
be installed in 2, 10, and 16 Mbyte configurations. Refer to section 2.7 for more information.
1.3.3 Floppy])rive Controller
The XVME-678/688 floppy drive controller can support up to two PC/AT-compatible floppy drives.
These drives can be any combination of 360 Kbytes, 720 Kbytes, 1.2 Mbytes, and 1.44 Mbytes.
1.3.4 Hard ])rive Controller
The XVME-678/688 uses the IDE interface for the hard drive controller. This 16-bit interface provides
complete hardware-level compatibility to the IBM PC/AT hard drive controller. Two drives can be
connected to the interface by daisy chaining the ribbon cable and setting one drive as the master and one
as the slave. (This requires setting jumpers on the drive. Consult your drive manual for more
information. )
1-4
CAUTION
The IDE ribbon cable should not exceed 18 inches. Otherwise, errors may
occur and data may be corrupted.
Most IDE drives should never be low-level formatted. Check your IDE
drive manual for formatting procedures.