Zenith Z-100 Reference Manual page 21

Page 2.4
System Operating Features
Table 2.1 (continued). Possible Power-Up Diagnostic Messages
+ + + ERROR: I nvalid/No ke yboard code re cei ved!
A message of this type indicates that the keyboard did not send the proper code
at powerup to indicate proper functioning. The most likely cause is a disconnected
keyboard. Check the cable (both ends in transportable systems) to make sure
it is connected.
the DISK ERROR: Drive not ready! +tt
+ t + DISK E RR OR: Seek failure!
These messages usually occur when you are attempting to boot an operaling sys-
tem. The cause is usually an open drive door or not having a disk properly inserted
in the system.
t t + DISK E RR OR: Rad disk co ntroller! t t . +
t + + DISK ERROR: DNA ov errun error! t t 4
Errors of this nature usually indicate a malfunction on the disk controller card,
but may also be caused by other defective cards in the system. If any nonstandard
cards have been installed, they should be suspected first in an error condition
of this nature.
+ + + DISK E RROR: Sec tor not fo und!
+ + t DISK ERROR: CRC e rror!
+ E. 4 DI SKERROR: I nvalid ad dress mark d ete cted! + E . t
These errors normally indicate that an operating system was not found on the
selected drive disk, or that you have a defective drive. First, try a different disk
If this error occurs often, it may be necessary to have the drive aligned or the
disk controller card checked by a qualified individual.
No Error Message — Occasionally, a malfunction may occur that, by its nature,
prevents anything, induding an error message, from being echoed to the monitor
screen. If you are using a color RGB monitor, first check the jumpers on the~
video card. Also check to make sure that you are allowing enough time (up to~
thirty seconds for Winchester systems) for any disk I/O problems to "time out".
and Explanations