NEC PowerMate 466M, Руководство по обслуживанию

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4-10 Maintenance and Troubleshooting
Diagnostic Output and Beep Codes
One beep indicates that the computer has completed its power-on self-test. If intermittent
beeping occurs, power off the computer and try again. If the beeping persists, see Table
Section 4-4 for diagnostic outputs and beep codes.
The diagnostic port output codes are placed at the diagnostic status port (port 80) to indi-
cate tests in progress and failed tests to someone with hardware that can detect the output.
If the FAILBEEP option is selected, the BEEP CODES are announced on the speaker only
if a fatal failure is detected. For instance, “2-1-4” (a burst of two beeps, a single beep, a
burst of four beeps) indicates a failure of bit 3 in the first 64 K of RAM. Both sets of codes
are only used prior to screen initialization and screen retrace verification. Once the screen is
believed operable, diagnostic reporting is via screen messages, except if MANLOOP EQU
TRUE and the jumpers say to loop on POST. In this case, it is assumed that no video
adapter is attached and some additional errors are reported via the diagnostic port and the
speaker.
Table Section 4-4 Diagnostic Output and Beep Codes
Diagnostic Port Output Beep Codes Description of Test or Failure
EB_PDIF EQU0400h Pointing device interface failure (mouse)
E_REGS EQU 01h 80486 register test in progress
E_CRAM EQU 02h 1-1-3 CMOS write/read test in progress or failure
E_BROM EQU 03h 1-1-4 BIOS ROM checksum in progress or failure
E_TIMR EQU 04h 1-2-1 Programmable Interval Timer test in progress or
failure
E_DMAI EQU 05h 1-2-2 DMA initialization in progress or failure
E_PAGE EQU 06h 1-2-3 DMA page register write/read test in progress or
failure
E_REFR EQU 08h 1-3-1 RAM refresh verification in progress or failure
E_RAM0 EQU 09h 1st 64 K RAM test in progress
E_MMUL EQU 0Ah 1-3-3 1st 64 K RAM chip or data line failure
E_MOEL EQU 0Bh 1-3-4 1st 64 K RAM odd/even logic failure
E_MADD EQU 0Ch 1-4-1 1st 64 K RAM address line failure
E_RAMP EQU 0Dh 1-4-2 1st 64 K RAM parity test in progress or failure
E_FSTIMR EQU 0Eh 1-4-3 Fail-safe timer test in progress
E_NMIIO EQU 0Fh 1-4-4 Software NMI port test in progress
E_MBIT EQU 10h 2-1-1 1st 64 K RAM chip or data line failure - bit 0
E_MBIT EQU 11h 2-1-2 1st 64 K RAM chip or data line failure - bit 1
E_MBIT EQU 12h 2-1-3 1st 64 K RAM chip or data line failure - bit 2