Arena Service Manual
Figure 5-14. Completed Installation
5.4.2.3 BIOS
The Basic Input/Output System (BIOS) program resides in a 256-
KB ROM located on the SBC. The BIOS is immediately activated
when the Instrument is first hard power on. The BIOS begins the
process of checking out the system and configuring it through the
Power-On Self Test. When these preliminaries are finished, the
BIOS seeks the operating system on the Compact Flash Memory
and launches it. The operating system is then run from the
SDRAM after loading, providing the framework for executing the
host control software. One of the initial activities of the host
control software is to read configuration information from the
Memory Board's SRAM and the DIP switch positions. The host
control software then proceeds into Calibration Mode or Clinical
Mode.
5.4.2.4 Hardware Control
The Pentium microprocessor controls the operation of the
Instrument through its connection to the following additional
boards, which are plugged into the Passive Backplane:
 4-Comm (Touch Screen) Interface board
 Blood Pump Controller board
 UF/Proportioning Controller board
 I/O Controller board
 Memory Board
 Hemavision (Hematocrit/Blood Volume Monitor) Board
(optional)
As mentioned before, 8040 microcontrollers on the three controller
boards handle specific Instrument-related functions for the Blood
5-20 157-1278-912 Rev A
November 2003
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