ADLINK NuPRO-598 SBC Maintenance Practical Guide

Power LED, keyboard lock, reset, hard disk LED, speaker: concentrated near CN11 (first row), specific pin mapping can be found in the manual.

4.4 LCD interface (CN4/CN5)

40 pin Flat Panel interface, supports 8/16/24 bit TTL signals, compatible with DSTN/TFT panels, panel type can be selected through BIOS (Panel-1-16, see manual for details).

Watchdog Timer Configuration - The Guardian of System Never Downtime

The watchdog of NuPRO-598 is based on Winbond W83977EF Super I/O and can be programmed through I/O ports 3F0h/3F1h. Typical usage: Reset the system after timeout (via KBRST signal).

5.1 Configuration Steps (Assembly Example)

The manual provides complete 8086 assembly code, with the following key points:

Enter extended function mode: Write 0x87 twice to 3F0h.

Select logic device 7 (configure reset output) and set the CRE2 register to enable Watchdog output.

Select logical device 8 (Watchdog control):

CRF3 (0xF3): Set the reset trigger condition (keyboard/mouse interrupt can be reset).

CRF4 (0xF4): Set the counting unit (bit6=1 for seconds, 0 for minutes).

CRF2 (0xF2): Set timeout value (1-255, 0 is prohibited).

Exit extended function mode: Write 0xAA to 3F0h.

5.2 Key points of C language porting

For modern maintenance tools, the above logic can be encapsulated as a C function:

c void enter_config() {outportb(0x3F0, 0x87);outportb(0x3F0, 0x87);}

void set_wdt_timeout(unsigned char seconds) {enter_config();

//Select device 8, set CRF2

outportb(0x3F0, 0x07);  outportb(0x3F1, 0x08);

outportb(0x3F0, 0xF2);  outportb(0x3F1, seconds);// . Other settings (refer to manual)

exit_config();}Engineering suggestion: Set the feeding interval to 1/2 of the timeout value to avoid accidental resetting.

BIOS Setting Points

The NuPRO-598 uses Award BIOS and can be accessed through the Del key. The following are key settings:

6.1 Standard CMOS Settings

Date/Time: Set the system clock.

Hard drive type: Supports automatic detection (Auto) or manual input of parameters (CYLS, HEADS, etc.).

LCD&CRT: Select display output (Auto/Tooth/CRT/LCD). If using LCD, select Panel Type in Power Management.

6.2 BIOS Features

Virus Warning: It is recommended to disable it, otherwise it may interfere with the diagnostic program.

Quick Power On Self Test: Enabled to speed up startup.

Boot Sequence: Can be set to C Only (boot from hard drive) or A, C, SCSI (floppy drive priority).

Security Option: Setup or System password can be set.

6.3 Chipset Features

System BIOS Cacheable/Video BIOS Cacheable: It is recommended to enable it to improve performance.

Memory Hold at 15M-16M: Used for ISA cards, usually disabled.

Power Supply Type: AT or ATX, determines power management behavior. If using ATX power supply, enable ATX mode and set Soft Off by PWR-BTTN.

6.4 Power Management

ACPI Function: Generally disabled (old system).

Power Management: can be set as User Define to finely control Doze/Standby/Suspend.

Video Off Method: Suggest V/H SYNC+Blank.

Wake Up On LAN/Ring: If remote wake-up is required, it should be enabled.

6.5 Integrated peripherals

IDE HDD Block Mode: Enabled improves transfer efficiency.

PIO/UDMA: Auto can automatically match hard drives.

Onboard Serial Port: COM1/COM2 address IRQ adjustable.

UART Mode Select: Normal is RS-232, IrDA/ASKIR is used for infrared communication (hardware required).

Hardware monitoring and fault warning

Onboard Winbond W83781D hardware monitoring chip, combined with Hardware Doctor software (Windows 95/98/NT), can monitor in real-time:

Voltage: VCORE,+3.3V,+5V,+12V, -12V.

Temperature: CPU temperature (onboard sensor) and system temperature (external JP6 thermistor).

Fan speed: CPU fan (3-pin, supports speed measurement).

Chassis activation: JP8 is connected to a micro switch, which will trigger an alarm once activated (password must be cleared).

Typical application: Set CPU Warning Temperature (such as 70 ℃) in BIOS, and the Speaker will sound an alarm when the temperature exceeds the limit. If the fan stops running and the voltage is abnormal, protective measures can be taken immediately.

Common troubleshooting and engineering experience

Q1: No display when the system is powered on, no code on the POST card?

Check if the CPU is installed correctly and if the heat sink is in good contact.

Clear CMOS (JP2 short circuit 1-2).

Check the power supply: whether the AT or ATX mode is correct (Power Supply Type and JP2/power cord in BIOS).

If using ATX, confirm that the PS-ON # signal is normal.

Q2: Unable to light up after replacing the CPU?

Verify JP7 multiplier, JP9 core voltage, and JP4/JP5 I/O voltage.

Ensure that the CPU is of the 66MHz FSB model (some AMD K6-3 models have 100MHz versions that require frequency reduction).

Check if the radiator is tightened, the overheat protection will be turned off.

Q3: Watchdog not working or resetting incorrectly?

Confirm that the program has entered configuration mode correctly and written CRF2 (non-zero value).

Confirm that CRF3 is set correctly (keyboard/mouse interrupt reset).

Check if external interrupts are frequently triggered (causing the counter to constantly reset).

Q4: Is the IDE hard drive unrecognized or slow?

Check if the IDE cable has 40/80 pins (UDMA requires 80 pins).