Turning On; Turning On For The First Time - Husky MP2500 Manual

If the MP2500 has been delivered from the factory, or stored without any
batteries for a long period, the internal backup battery will be flat. The
MP2500 can still be used (by fitting a main battery or connecting the
MP2500 AC Adaptor), but RAM contents may not be retained if the power
source is removed. The backup battery will begin trickle charging when you
fit batteries and execute software programs, but may take a long time to
charge completely. To fully recharge the backup battery, ensure alkaline
batteries are NOT fitted and connect the AC Adaptor. Leave it on charge for
a total of 72 Hours (e.g. for 5 overnight charging sessions).
One overnight charging session normally provides sufficient initial backup
for typical use.

5.3 Turning on

To turn on, press the P POWER key firmly.
If the unit does not power on, it is necessary to perform a 'hard' reset.
Press and hold down both S (SHIFT) keys, then also hold down the P
(POWER) key for at least 5 seconds. Release all three keys and after a
brief delay the MP2500 should start, by sounding a beep and displaying the
Welcome screen (or other screen, depending on the MP2500's
configuration).
Follow any instructions displayed on the screen.

5.3.1 Turning on for the first time

If you are turning on for the first time you should see a screen like this:
This is the 'Welcome' screen, which shows that the MP2500 is starting up
for the first time (or has been reset). Press any of the 'normal' keys (such
as A or E) to load MS-DOS. This is also known as a 'cold start'.
16 H MP2500 System Developer's Guide
USKY