Recent updates to this site

2020/09/10: Casio FX-700P hardware - cassette tape interface command "Carrier detected", terminology
2020/08/11: New project: Modification of the Elektronika MK-85
2020/04/10: differences between Elektronika MK-85 and Casio FX-700P - function VAL, array indexes
2020/04/10: Elektronika MK-85 ROM disassembly listing - comments to the expression evaluator
2020/03/12: Elektronika MK-85 ROM disassembly listing - revised comments to the arithmetic routines
2020/02/22: conversion utilities for the MK-85 emulator - utility RAM2VARS
2020/01/13: New document: Casio SFR-20 circuit diagram
2019/12/06: circuit diagram of the FA-4 interface - added CM-1 connector
2019/11/30: version 17 of the Elektronika MK-90 emulator
2019/11/29: New page: Elektronika MK-90 read-only memory cartridge
2019/11/21: KA1835VG4 datasheet - added diagrams
2019/09/07: version 49 of the Elektronika MK-85 emulator
2019/09/07: version 16 of the Elektronika MK-90 emulator
2019/07/30: Updated assemblers: μPD1007 and HD62076/μPD3055
2019/07/21: comments to the Casio FX-8000G ROM disassembly - file editor
2019/06/30: New link to programs for Elektronika MK-90/li>
2019/06/15: New link to a web site FOROPLUS - calculators programmable in BASIC
2019/06/09: New link to a project of a memory module for Elektronika MK-90 based on STM32 microcontroller
2019/06/09: Copy of a book from a disappeared web site: Programmsammlung für den Casio PB1000 (in German)
2019/03/08: New page: How to read out the contents of a memory card using a PB-2000C
2019/03/02: New project: Self-made equivalent of the SB-43 interface unit for the FP-40 thermal printer
2019/01/14: Link update: the web dedicated to the Elektronika MK-85 mk85.republika.pl has moved to a Facebook group "Old soviet pocket computers and calculators"
2019/01/13: New device: Casio FP-40 thermal printer
2018/12/26: New page: How to read out the internal ROM contents of an HD6305Y1 microprocessor
2018/11/15: Memory cartridge MPO-10 for the Elektronika MK-90 - text and tables copied from the original KA1835VG2 datasheet
2018/11/13: Elektronika MK-90 hardware - text and tables copied from the original KA1835VG1 datasheet
2018/11/11: Elektronika MK-90 hardware - text and tables copied from the original KA1835VG3 datasheet
2018/10/20: schematics of the Elektronika MK-90 system board
2018/09/12: Elektronika MK-85 - trigonometric functions with angles lower than ±1E-127 radians
2018/09/11: Elektronika MK-85 - LCD controller bus
2018/08/13: Link update: Elektronika MK-85 remake
2018/08/02: Elektronika MK-90 CPU board circuit diagram and wire list
2018/07/29: updated documents about Casio FX-602P programming part 1 and part 2
2018/04/10: graphics routines for an Elektronika MK-90 - bug fix
2018/03/09: Elektronika MK-90 hardware - text and tables copied from the original KA1835VG5 datasheet
2018/03/05: Elektronika MK-90 hardware - text and tables copied from the original KA1835VG4 datasheet
2018/02/25: The Elektronika MK-85 emulator has been ported to Lazarus
2018/02/24: The Casio FX-8000G emulator has been ported to Lazarus
2018/02/23: The Casio FX-7500G emulator has been ported to Lazarus
2018/02/11: New documents on the Casio FX-602P
2018/01/22: version 48 of the Elektronika MK-85 emulator
2018/01/22: version 15 of the Elektronika MK-90 emulator
2017/12/21: programs ramtrans and ramtran2 - improved source code portability
2017/09/20: New document: Casio PB-1000C CASL/COMET manual
2017/08/04: New file: BASIC+CASL language card for the PB-2000C emulator
2017/06/03: New document: partially commented PB-1000C ROM disassembly listing
2017/05/21: New link to a document Information and programs for the Casio FX-602P
2017/05/02: New images: The touch digitizer on top of the PB-1000 LCD
2017/03/19: New file: PB-1000C ROM image for the emulator
2016/12/09: comments to the Casio FX-7500G ROM disassembly - line drawing procedure &HB313
2016/12/09: comments to the Casio FX-8000G ROM disassembly - line drawing procedure &H0C3D
2016/12/03: New book: PB-1000 Technical Reference
2016/11/26: New book: PB-1000 Intern - fully commented Casio PB-1000 ROM disassembly (in German)
2016/10/07: fixed a software bug in the MD-100 compatible solid state mass storage device that corrupted large sequential files
2016/08/21: version 47 of the Elektronika MK-85 emulator
2016/07/21: differences between Elektronika MK-85 and Casio FX-700P - function MID
2016/07/19: Casio FX-700P memory map - locations $0120-$012F
2016/04/08: comments to the ROM disassembly listings - PB-1000, PB-2000C, OM-53B (variables)
2016/03/20: Forth for the Casio PB-1000 - fixed the EXPECT statement
2016/03/20: PB-1000 text screen buffer
2016/03/17: New documents: PB-2000C Owner's Manual and Introduction to the C programming language
2016/03/03: PB-1000 power supply circuit
2016/02/04: programming of the LCD controller chipset HD44352A01/HD44356A01, HD44353 - contrast control, differences between PB-1000/PB-2000C and FX-8000G
2016/01/06: comments to the Casio FX-8000G ROM listing - tape and printer routines
2015/12/30: circuit diagram of the FA-80 interface - switch NOR / 80 CHR
2015/12/22: description of the HD61710A01 interface chip - port PA and PB name assignments brought to order, serial port register bits
2015/12/21: comments to the ROM disassembly listings - PB-1000, PB-2000C, OM-53B (serial port, tape)
2015/12/08: circuit diagram of the FA-7 interface - added voltage converter and battery level indicator
2015/11/30: PCB layout for the MD-100 compatible solid state mass storage device
2015/11/26: New project: MD-100 and FA-7 compatible USB interface
2015/10/10: fixed a bug disturbing the REV display mode in the PB-1000 ROM listing at the address &H05C2, updated the ROM image file "rom0.bin" in the emulator
2015/10/01: New documents: PB-1000 Owner's Manual and PB-1000 Command Reference
2015/09/17: description of the HD61710A01 interface chip - serial port register bits
2015/04/22: New document: Casio FX-602P schematic
2015/04/09: New document: Casio FX-603P schematic
2015/03/19: version 15 of the MD-100 emulator
2015/02/02: New project: MD-100 compatible solid state mass storage device
2015/01/23: New image: MD-100 bus timing diagram
2014/09/27: comments to the ROM disassembly listings - PB-1000, PB-2000C, OM-53B, FX-8000G
2014/09/26: Description of the HD61710A01 interface chip - serial port receiving error bits
2014/08/27: Games for the Casio FX-8000G - Space Invaders (updated), Minotaur (new), Chess (new)
2014/08/26: New project: simple serial interface for the Casio FX-8000G
2014/08/15: fixed a bug disturbing assignments to multiple variables in the FX-8000G ROM listing at the address &H1460, updated the ROM image file "rom0.bin" in the emulator
2014/07/17: New document: Casio FX-702P schematic
2014/07/12: New program: classic arcade game "Space Invaders" for the Casio FX-8000G
2014/06/29: RAM chip uPD444G
2014/06/23: New document: Casio FX-502P schematic
2014/05/15: New document: Casio PB-700 schematic
2014/03/21: Forth for the Casio PB-1000 - included fig-Forth word set specification "glossary.txt"
2014/03/02: New: files to emulate a financial calculator FC-1000
2014/03/02: version 05 of the FX-7500G emulator
2014/02/15: updated ROM disassembly listings: Casio FX-7500G, Casio FX-8000G - key code tables
2014/02/09: New program: Casio FX-7500G emulator for Windows
2014/01/26: updated disassembly listings: DVK-1 BASIC, MK-90 ROM V1.0 and V2.0 - function EVAL
2014/01/20: version 09 of the FX-8000G emulator
2014/01/18: HD62076/μPD3055 manual - timer
2013/12/15: HD62076/μPD3055 manual - interrupts (register IE, instruction WAI)
2013/11/30: New calculator: Casio FX-7500G
2013/11/15: New program: HD62076/μPD3055 assembler
2013/11/11: HD62076/μPD3055 disassembler
2013/11/04: HD62076/μPD3055 manual - registers and instructions related to the integrated display controller (S5, S6, S7, PLA, STLM)
2013/09/01: New link to a PDF document: Casio PB-1000, communication with a PC and a printer
2013/02/12: games for the Elektronika MK-90 - added choice to turn the sound on and off
2012/12/28: Executing machine code on the Casio PB-2000C - fixed a bug in the loader causing longer files to be truncated
2012/08/17: HD61700 assembly language manual - TM register
2012/08/11: fixed corrupted ROM dump of the OM-53B BASIC language card, affected was the command CLOSE and leaving the BASIC interpreter
2012/08/10: version 47 of the PB-1000 emulator
2012/08/10: version 23 of the PB-2000C emulator
2012/08/03: HD61700 assembly language manual - Test Mode flag, instruction execution time (interrupts, internal ROM)
2012/07/28: version 45 of the PB-1000 emulator
2012/07/28: version 21 of the PB-2000C emulator
2012/07/28: HD61700 assembly language manual - instruction OFF, power-off state, turning the power on
2012/07/19: New page: PB-2000C - undocumented commands
2012/07/01: New program: C cross compiler for the PB-2000C emulator
2012/07/01: comments to the Casio PB-2000C ROM disassembly - C language compiler
2012/06/07: New link to a Multi Emulator Super System (MESS) for many game consoles and computer systems, including the Casio models PB-1000 and PB-2000C
2012/06/06: New link to a Sharp pocket computer emulator "PockEmul" which also emulates the Casio models PB-1000 and PB-2000C along with peripheral units MD-100 and FP-100
2012/06/03: comments to the Casio PB-2000C ROM disassembly (C language module) - lexical analyser, preprocessor, symbol declarations, arithmetic operations
2012/04/17: comments to the Casio PB-1000 ROM disassembly - line drawing procedure &HC477
2012/04/17: comments to the Casio PB-2000C ROM disassembly - line drawing procedure &H398F
2012/04/17: comments to the ROM disassembly of the OM-53B BASIC language card - line drawing procedure &H4054
2012/01/13: version 08 of the FX-8000G emulator - only small cosmetic modifications
2012/01/08: Elektronika MK-90 hardware - CPU board circuit diagram
2011/12/29: Elektronika MK-90 hardware - original datasheets of the KA1835VG series chips, system board circuit diagram
2011/12/29: Memory cartridge MPO-10 for the Elektronika MK-90 - pin assignment diagram and original datasheet of the KA1835VG2 controller, circuit diagram
2011/11/29: comments to the MK-90 ROM disassembly BASIC 1.0, BASIC 2.0 - number conversion and arithmetic routines
2011/11/29: comments to the DVK BASIC ROM disassembly - number conversion and arithmetic routines
2011/11/02: comments to the internal ROM disassembly of the Casio PB-1000 processor - floating point arithmetic routines
2011/11/02: comments to the internal ROM disassembly of the Casio PB-2000C processor - floating point arithmetic routines
2011/10/21: version 07 of the FX-8000G emulator
2011/10/21: Casio FX-8000G assembly language manual - instructions NA, NAM, TNA, TNAM
2011/10/16: Casio FX-8000G hardware - keyboard layout
2011/10/15: HD62076/μPD3055 manual - indirect register access and other
2011/10/15: HD62076/μPD3055 disassembler
2011/10/15: SF-9300 diagnostic code
2011/10/13: New program: implementation of the classic game Tetris for the PB-1000
2011/09/29: New program: FX-8000G emulator for Windows
2011/09/29: internal ROM disassembly listing of the Casio FX-8000G microprocessor
2011/09/07: Casio FX-8000G assembly language manual - indirect register access
2011/08/31: version 43 of the PB-1000 emulator
2011/08/31: version 19 of the PB-2000C emulator
2011/08/30: programming of the LCD controller chipset HD44352A01/HD44356A01, HD44353 - cursors
2011/08/24: Casio FX-8000G assembly programming - instructions CMPBM, LDM, STM, register AS.
Updated files: assembly language manual, assembler, disassembler
2011/08/12: Casio FX-8000G assembly programming - indirect register access.
It was necessary to change the notation of indirectly specified registers. The concept of the virtual IND register and the notation of register arrays using the first register and the number of bytes have been abandoned.
Updated files: assembly language manual, assembler, disassembler, internal and external ROM listing
2011/08/01: Casio FX-8000G assembly programming - instructions TRP, OFF.
Updated files: assembly language manual, assembler, disassembler
2011/07/25: Casio FX-8000G assembly language manual - keyboard port
2011/07/25: Casio FX-8000G ROM listing - self-test routine
2011/07/21: New file: internal ROM disassembly listing of the Casio FX-8000G microprocessor
2011/07/20: Casio FX-8000G assembly programming - instructions SUP, SDN, SWPM, BNUSM.
Updated files: assembly language manual, assembler, disassembler
2011/07/10: Casio FX-8000G assembly programming - the port ENx control register temporarily named S1 has been merged into the IF register.
Updated files: assembly language manual, assembler, disassembler, FX-8000G ROM listing
2011/07/02: Casio FX-8000G assembly language manual - interrupt flags in the IF register
2011/06/19: comments to the internal ROM disassembly of the Casio PB-1000 processor - function &H08DD (square root)
2011/06/19: comments to the internal ROM disassembly of the Casio PB-2000C processor - function &H071F (square root)
2011/05/22: Forth for the Casio PB-1000 - fixed bug in the (LOOP) command where unsigned instead of signed comparison was used
2011/05/06: Elektronika MK-90 - hardware
2011/04/13: New file: Circuit diagram of the SB-41 interface between the calculator PB-700 and the printer FP-40
2011/03/31: games for the Elektronika MK-90 - fixed noisy sound
2011/03/21: INFLATE decompressor for the Elektronika MK-90 - fixed bug in the loader
2011/03/21: fixed boxing game for the Elektronika MK-90
2011/02/23: comments to the ROM disassembly listing of the microprocessor HD6305Y1 (MD-100 interface)
2011/02/14: programming of the MD-100 floppy disk drive - commands &H60 (file rename) and &HD0 (free disk space)
2011/02/14: New file: ROM dump and disassembly listing of the microprocessor HD6305Y1, which controls the MD-100 floppy disk system
2011/02/10: New file: circuit diagram of the MD-100 floppy disk system
2011/02/06: New file: photograph of the MD-100 printed circuit board
2011/01/23: programming of the LCD controller chipset HD44352A01, HD44353 - added information about the chip HD44356A01 and program examples for the calculator FX-8000G
2011/01/14: New page: description of the HD61710A01 interface chip
2011/01/12: New file: circuit diagram of the FA-7 interface
2011/01/10: Casio FX-8000G hardware - bus waveforms
2011/01/09: New file: circuit diagram of the FA-80 interface
2011/01/04: New page: Casio FX-8000G hardware