Digi PortServer/8 User Manual page 80

Set temporary stack at 00400h.
Data segment now available (00800h).
Test 256K DRAM from 40000h to 7FFFFh.
Test 256K DRAM from 80000h to BFFFFh.
Test 256K DRAM from C0000h to FFFFFh.
Set BIOS stack at 3FC00h.
Transfer interrupt vectors from EPROM to DRAM.
Disable all hardware interrupts.
Enable interrupts.
Check for 16 asynchronous (RS-232) ports.
Check for NIC (Network Interface Controller).
Board configuration is set.
Real time clock is started (Timer 0).
NIC and async ports are initialized.
EEPROM verified.
Data from EPROM is moved to DRAM data segment
(00800h).
Initialization complete.
Displays "dE" for 5 seconds for user diagnostic entry.
Displays "bE" as BIOS automatically exits to Ethernet
operating system.
Upon completion, the POST sequence will automatically proceed to Command Mode and display
"dE" on the 7-segment display. At this point, the operator has five seconds to select user
diagnostics. During this five second period, the LEDs display the contents of the status error
word. If no errors were detected, the ten LEDs will all be off. Any LEDs remaining on indicate
that the corresponding test (see the preceding table) failed.
After the five second delay, the 7-segment display will change to "bE", indicating that the BIOS
has switched control to the Ethernet operating system, and finally to "AC" when the PortServer
is ready for operation. (The switch to "bE" is usually too fast to be seen.)
User diagnostics may be selected from Command Mode (during the five second delay). To run
the user diagnostics from a terminal, press "V" or "v" on the terminal connected to Port 1 (VT-
100, 9600, 8, N, 1). To run the diagnostics from the front panel, press one of the pushbuttons
while "dE" is displayed.
Page 72 Ÿ PortServer Terminal Server
RTS
CTS
DSR
DCD
DTR
RI
OFC
IFC