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System Operations - HP -28S Quick Reference

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Contrast
adjustment
Clear memory
WARNING: This clears the entire memory including stack, variables,
programs and flags. This is essentially a "restore to defaults".
Endless-loop
interruption
This will clear the stack, go to HOME, clear UNDO, COMMAND, LAST,
clear the CUSTOM menu, deselect TRACE printing.
Note that a program or other lengthy operations can usually be
interrupted by pressing "ON".
System test
This will execute a system test once (↓) or repeatedly (←).
Press ON/↑ to abort the test. The single test will also execute the
keyboard test.
Note that the system test behaves differently with different software
versions.
Keyboard test
This will execute a keyboard test where the user must press all keys
from top left to bottom right.
Note that the system test behaves differently with different software
versions.
SYSEVAL
Execute subroutine at absolute address. For debug only.
Warning: Addresses change between different versions of the HP-28S
software. Calling an invalid address usually resets the machine and
causes a "Memory lost" error.
• #10d SYSEVAL return the software version number

System Operations

Press and hold ON
Press + or – to change the contrast
Release ON
Press and hold ON
Press and and release INS and → (cursor right)
Release ON
Press and hold ON
Press and release ↑ (cursor up)
Release ON
Press and hold ON
Press and release ↓ (cursor down) or ← (cursor left)
Release ON
Press and hold ON
Press and NEXT
Release ON
HP-28S
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