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Casio PB-2000C - undocumented commands

OM-51P PROLOG card, OM-52C C language card, native system

CLEAR SUM
ROM card sum and xor test.
CLEAR MON
Monitor program like the PB-1000 MON command.

OM-53B BASIC card

SYSTEM SUM
ROM card sum and xor test.
SYSTEM SW
Invokes the RS232C settings menu similar to the VX-4 F.COM>Device>Switch menu.
SYSTEM COPY
Copies a complete MD-100 disk to another disk.
SYSTEM SET
Puts a sequence of key codes (two hexadecimal digits separated by commas) into the key buffer.
Example (puts a string "HELLO" into the keyboard buffer):
10 SYSTEM SET 48,55,4C,4C,4F,0D
20 INPUT A$
30 PRINT A$
SYSTEM CALL
Calls a machine code program which can be specified by a memory address or a file name. The program can return to BASIC or the CAL mode by the sequence of instructions PST UA,&H54 and RTN.
SYSTEM BEEP pitch, duration
Emits a sound of frequency = 455000 / (pitch*27 + 122) Hz. The duration time is specified in seconds, allowed range 1 to 59. The allowed range of the pitch parameter is 1 to 255.
SYSTEM CHR$ (code)
Displays a character of specified code at the cursor position using the LCD controller text mode. Its use makes sense only in programs, because it doesn't modify the contents of the LEDTP buffer.
Example (displays a character "A"):
10 SYSTEM CHR$ (65)
20 GOTO 20

Credits to Xerxes.