The calculator had a BASIC interpreter, MEMO function, a formula library. 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. An optional Casio FA-6 interface board provided a cassette tape recorder connector, a Centronics printer connector and an RS-232C port. The calculator could print data and listings on any Centronics printer; printing graphics required the Casio FP-100 plotter-printer.
Later, Casio released the FX-880P, which had 32 kB built-in memory. With a RP-33 expansion module, this model could be upgraded to a total of 64 kB.
The memory layout is:
0000-00FF Screen memory
0100-01FF Reserved for internal functions
0200-02FF INPUT Buffer
0300-03FF CALCJMP, VALF Buffer
0400-04FF Reserved for IN/OUT/CALC modes (CALC$)
0500-074A Reserved for internal functions
074B-0752 Reserved for storing the user PASSWORD
0753-175A Reserved for internal functions
175B-175C Vector pointing to MEMO memory start
175D-1FE4 Reserved for internal functions
1FE5-1FFF Vectors pointing to P0-P9 memory start
2000-9FFF User memory (shared by MEMO and P0-P9)
A000-BFFF Repetition of 0000-1FFF
C000-DFFF Repetition of 0000-1FFF
E000-FFFF Repetition of 0000-1FFF
Memory area A000-FFFF was either available as user memory (if expansion was present), or would simply repeat the contents of 0000-1FFF
A few glitches are:
POKE 1867,0 → would delete any user PASSWORD
POKE PEEK(8027)+256*PEEK(8028),32 → would recover contents of MEMO after a RESET ALL
POKE PEEK(8027)+256*PEEK(8028),26 → would hide contents of MEMO, much like a RESET ALL would do, but without losing the programs
The internal function library was programmed in BASIC itself and could be extracted with a BASIC decompiler.
Any function in the library can be executed from a regular BASIC program by using GOTO "LIB0:NNNN" where NNNN is the function number (e.g. 5010 for prime factorization). The command GOTO "LIB0:0400" executes a self-test program.
Characters 252 to 255 were user defined. They could be defined by issuing the command DEF CHR$(n)="HHHHHHHHHH" where n ranges from 252 to 255 and the H's are 10 hexadecimal digits (5 bytes). Every byte defines the pixel pattern for a column. Since a column is 7 pixels high, the least significant bit of every byte is ignored.
The CHR$(26) would activate a different character set for Katakana and Kanji characters. CHR$(27) would deactivate Kanji.
Via a serial cable the calculator could connect to a PC or to another Casio FX-850P, allowing the transfer to MEMO and stored programs.
^"Casio - FX-850p - - Ordinateur de poche - Casio FX850p - Casio.ledudu.com - bibliothèque des ordinateurs et des calculatrices Casio de ledudu. - RETRO CALCULATOR FX PB SF LC SL HP FA".
External links
Casio FX-850P on MyCalcDB Database of 1970s and 1980s pocket calculators
January 06, 2023
casio, 850p, scientific, calculator, introduced, 1987, sold, until, 1999, typepocket, computermanufacturercasiocalculatorentry, modeinfix, basicdisplay, typelcd, matrixdisplay, size2, charactercpuprocessorhitachi, hd62002a01programmingprogramming, language, ba. The Casio FX 850P is a scientific calculator introduced in 1987 and sold until 1999 Casio FX 850PTypePocket ComputerManufacturerCasioCalculatorEntry modeInfix BASICDisplay typeLCD Dot matrixDisplay size2 32 CharacterCPUProcessorHitachi HD62002A01ProgrammingProgramming language s BASICInterfacesPortsone vendor specificConnects toCompact Cassette via FA 6Line Printer via one of FA 6 Centronics printer portPC via one of FA 6 RS 232OtherPower supply2 CR2032 Lithium 1 CR1220 LithiumWeight197 g 1 Contents 1 Specifications 2 See also 3 References 4 External linksSpecifications Edit2 lines with 32 5 7 characters LCD some indicators and a 5 digit 7 segment display 4 KB RAM FX 860P 24 KB FX 880P 32 KB CPU VLSI at 1 228 MHz Hitachi HD62002A01 FX 860P FX880P HD62002A03 Integrated speaker Internal slot for memory expansion 32 KB Connector with support for RS232 and Centronics only level converter for RS232 Centronics needed LCD Driver 2 x HD66100F 2x 3V CR2032 lithium batteries as main power supply 1x 3V CR1220 lithium battery as memory backup RAM power supply User s manual at http www usersmanualguide com casio calculators fx 850pThe calculator had a BASIC interpreter MEMO function a formula library 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 An optional Casio FA 6 interface board provided a cassette tape recorder connector a Centronics printer connector and an RS 232C port The calculator could print data and listings on any Centronics printer printing graphics required the Casio FP 100 plotter printer Later Casio released the FX 880P which had 32 kB built in memory With a RP 33 expansion module this model could be upgraded to a total of 64 kB The memory layout is 0000 00FF Screen memory 0100 01FF Reserved for internal functions 0200 02FF INPUT Buffer 0300 03FF CALCJMP VALF Buffer 0400 04FF Reserved for IN OUT CALC modes CALC 0500 074A Reserved for internal functions 074B 0752 Reserved for storing the user PASSWORD 0753 175A Reserved for internal functions 175B 175C Vector pointing to MEMO memory start 175D 1FE4 Reserved for internal functions 1FE5 1FFF Vectors pointing to P0 P9 memory start 2000 9FFF User memory shared by MEMO and P0 P9 A000 BFFF Repetition of 0000 1FFF C000 DFFF Repetition of 0000 1FFF E000 FFFF Repetition of 0000 1FFFMemory area A000 FFFF was either available as user memory if expansion was present or would simply repeat the contents of 0000 1FFFA few glitches are POKE 1867 0 would delete any user PASSWORD POKE PEEK 8027 256 PEEK 8028 32 would recover contents of MEMO after a RESET ALL POKE PEEK 8027 256 PEEK 8028 26 would hide contents of MEMO much like a RESET ALL would do but without losing the programsThe internal function library was programmed in BASIC itself and could be extracted with a BASIC decompiler Any function in the library can be executed from a regular BASIC program by using GOTO LIB0 NNNN where NNNN is the function number e g 5010 for prime factorization The command GOTO LIB0 0400 executes a self test program Characters 252 to 255 were user defined They could be defined by issuing the command DEF CHR n HHHHHHHHHH where n ranges from 252 to 255 and the H s are 10 hexadecimal digits 5 bytes Every byte defines the pixel pattern for a column Since a column is 7 pixels high the least significant bit of every byte is ignored The CHR 26 would activate a different character set for Katakana and Kanji characters CHR 27 would deactivate Kanji Via a serial cable the calculator could connect to a PC or to another Casio FX 850P allowing the transfer to MEMO and stored programs See also EditCasio calculator character setsReferences Edit Casio FX 850p Ordinateur de poche Casio FX850p Casio ledudu com bibliotheque des ordinateurs et des calculatrices Casio de ledudu RETRO CALCULATOR FX PB SF LC SL HP FA External links EditCasio FX 850P on MyCalcDB Database of 1970s and 1980s pocket calculators Retrieved from https en wikipedia org w index php title Casio FX 850P amp oldid 1101426437, wikipedia, wiki, book, books, library,
