
MORLEY-IAS
ZXa / Zxe
C
OMMISSIONING
M
ANUAL
Page
30
Document No.996-071, Revision:
1
,
Aug 99
7.3 Crystal
•
The bus operating frequency is precisely measured during manufacture. The measured value is marked on the
CPU board.
•
This option allows the measured crystal frequency to be entered into the memory so that the software can employ
an adjustment factor to maintain an accurate date and time clock.
•
To select the option, press
7
and the display shows:
BUS FREQUENCY RUNNING AT 3.68678 MHz OK ?
•
If the frequency is correct, press Yes to return to the previous menu.
•
If the frequency is not as marked on the CPU, press No and enter the least significant three digits using the
number keys.
•
Increasing the number by one will make the time clock lose two seconds per week. Decreasing the number by
one will give a gain of two seconds per week.