1FE5-1FFF Vectors pointing to P0-P9 memory start.175D-1FE4 Reserved for internal functions.175B-175C Vector pointing to MEMO memory start.0753-175A Reserved for internal functions.
CASIO FX 880P PROGRAMS PASSWORD
074B-0752 Reserved for storing the user PASSWORD. 0500-074A Reserved for internal functions. 
0400-04FF Reserved for IN/OUT/CALC modes (CALC$).
0100-01FF Reserved for internal functions. With a RP-33 expansion module, this model could be upgraded to a total of 64 kB. Later, Casio released the FX-880P, which had 32 kB built-in memory. The calculator could print data and listings on any Centronics printer printing graphics required the Casio FP-100 plotter-printer. An optional Casio FA-6 interface board provided a cassette tape recorder connector, a Centronics printer connector and an RS-232C port. The built-in 8 kB memory could be expanded using the optional Casio RP-8 (8 kB) or RP-33 (32 kB) RAM expansion modules. The calculator had a BASIC interpreter, MEMO function, a formula library. 1x 3V CR1220 lithium battery as memory backup (RAM power supply). 2x 3V CR2032 lithium batteries as main power supply. Connector with support for RS232 and Centronics (only level converter for RS232, Centronics needed). Internal slot for memory expansion (32 KB). (some indicators and a 5 digit 7-segment display).
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