User guide

Message Possible cause
Remedy
Not a boot diskette -
strike 7 to retry boot
Diskette in drive A: not
formatted or start not possible
Replace diskette and reboot
No timer tick interrupt Timer chip failure Check timer chip on CPU
Hex-value optional
ROM bad checksum =
hex - value
Peripheral card has defective
ROM
Replace card
Shutdown failure
Failure of keyboard controller
or connecting logic circuit
Check keyboard controller
Time-of-day not set -
Please run SETUP program
Clock not set Start SETUP
No boot device available -
strike 7 to retry boot
Drive A:, hard drive or
diskette defective
Reboot. If still not possible,
replace faulty component
Timer chip counter 2 failed Chip failure Check timer chip
Unexpected interrupt in
protected mode
Non-maskable interrupt
(NMI) cannot be switched off
Check CPU, especially the
logic circuit of interrupt
Unexpectedtype02
I/O card parity or memory
parity interrupt at xxxx:yyyy
Type (S)hut off NMI,
(R)eboot;
other keys to continue
Error in writing to system
memory or in use of I/O
registers
Replace memory chip
MS-DOS system error messages Appendix
GB - 90