Dataman S4 Manual page 7

DATAMAN S4 MANUAL
itself off at the end of this time. If you press a key
during the
beeping, power-down is prevented. No data is lost
by power-down,
but you have to switch-off-and-on-again to get the
power back.
If a charger is connected, S4 remains on. If the
battery runs down
to the 25% point, it is automatically recharged.
S4 also powers down when it believes that the
battery is getting too
low - less than 8.4 volts. At this level, data and
program can
be preserved, but nothing else works. It warns you
first, both audibly
and with a message. If the voltage goes below 8
volts it turns off
immediately without warning. S4 cannot do
anything useful without
power, except preserve the memory contents.<MI>
<BI>The only cure is to charge the battery.
Memory Upgrade to 512K
S4 user memory can be upgraded by changing the
1M static RAM chip
for a 4M part. The only suitable static RAM at
time of writing is
a Hitachi HM628512LP due for release 2nd
quarter 1992. If that is
not available then there is a 4M module
HM66205L. RAMS of any speed will
work, but faster parts improve access time for
emulation.
The upgrade procedure is simple.. First switch off
then:
Introduction to S4 7