
EPC-7 Hardware Reference
For best possible performance, the BIOS initialization software copies 64 KB of the
ROM contents into DRAM (called shadowing) at addresses 000Fxxxx. If the BIOS
discovers a video controller present containing a video BIOS, the BIOS copies the
video BIOS into DRAM at addresses 000C0000-00C7FFF. If the SCSI controller is
enabled, the BIOS copies the SCSI BIOS into addresses 000C8000-000CFFFF. The
BIOS write-protects these areas of memory, even if not being used for BIOS
shadowing.
The BIOS also uses a control bit (MDFF in the memory mode register) to remove the
EPROM from just below the 16 MB boundary after initialization to ensure a
contiguous DRAM space for EPC-7s with 16 MB or more of memory.
SCSI Controller
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The SCSI controller is based on the Adaptec AIC-6360 I/O processor, which is sup-
ported by a large base of software drivers. The drivers support a range of operating
systems and SCSI devices, including disks, streaming tapes, CD ROMs, and digital
audio tapes. SCSI software does not ship with the EPC-7, but a separate SCSI
software and manual package is available at not charge. Contact RadiSys Technical
Support for ordering information. If you need to use SCSI software with a non-
DOS/Windows operating system, contact Adaptec sales at 1-800-442-7274.
The controller is compatible with SCSI-2 and CCS (common command set). It
supplies a transfer rate of up to 5 MB/s for synchronous transfers from the buffer on
the SCSI bus, or up to 3 MB/sec sustained rate. The controller's registers are mapped
to I/O space addresses 340-35E.
The EPC-7 contains no internal SCSI devices; the controller connects only to a front-
panel connector for an external SCSI bus. SCSI TERMPWR is provided by a solid-
state switch having current limiting and thermal shutdown.
Floppy Disk Controller
The floppy disk controller is a standard PC compatible controller, connecting to one
of two floppy disk connectors: a 34-pin or a 26-pin floppy conector. This is a build-
time options. The header and cable supply power to the floppy drive, as well as carry
the drive signals. This cannot be disabled.
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