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Vintage programmable calculators

Casio FX-700P

• Hardware description
• Internal data representation, BASIC program structure, memory map, file formats
• Some information specific to the FX-730P calculator
• The FA-3 Cassette Interface
• The FP-12 Thermal Printer
• Self-made mass storage and printer interface
• Service manual for the Radio Shack PC-4 (OEM version of the Casio FX-700P/PB-100)
• Service manual for the Radio Shack PC-6 (OEM version of the Casio FX-780P), circuit diagram representative of many other Casio calculators (FX-730P inclusive)

Casio PB-700

• Hardware description
• Internal data representation, BASIC program structure, file formats
• The FA-4 Cassette and Printer Interface
• Circuit diagram of the SB-41 unit - printer interface board and calculator interface board
• Self-made serial and printer interface

Casio PB-1000

• Hardware description
• Internal data representation
• Internal ROM of the HD61700 processor
• Description of the HD61700 microprocessor assembly language - based on the English version of the original Casio manual and on the document which accompanies the HD61700 Cross Assembler, covers documented and undocumented instructions.
• Simple HD61700 disassembler
• Reconstructed and partially commented internal 6kB ROM program listing
• Partially commented external 32kB ROM disassembly
• PB-1000 emulator for Windows
• Simple RS232 interface
• Programming of the LCD controller
• PB_Forth - implementation of the Forth programming language for the PB-1000
  Links to the language standard documents: Forth-79, Forth-83
• Implementation of the classic game Tetris for the PB-1000 - contributed by Alfonso Luis Suarez Diaz

Casio PB-2000C

• Hardware description
• Undocumented commands
• Partially commented internal 6kB ROM disassembly, extracted in a similar way as in case of the PB-1000
• Partially commented external 64kB ROM disassembly
• ROM dump and partially commented disassembly of the OM-53B BASIC language card
• Executing machine code
• PB-2000C emulator for Windows
• Service manual

Casio MD-100

• Technical information about the MD-100 floppy disk drive
• Circuit diagram of the FA-7 interface, partially relevant for the MD-100, omitted RS232 voltage converter and power supply monitor
• Circuit diagram of the MD-100 floppy disk system
• Description of the HD61710A01 interface chip
• Photograph of the MD-100 printed circuit board
• ROM dump and disassembly listing of the microprocessor HD6305Y1, which controls the floppy disk system
• Program to read and write the MD-100 floppy disk images on a PC
• MD-100 emulator for Windows

Casio FX-602P

This machine is no longer in my possession. Character and keyword codes Description of the expansion port The FA-2 Cassette Interface Self-made serial and printer interface

Casio FX-8000G

Hardware description Description of the reverse engineered NM320/μPD1007/uPD1007 microprocessor instruction set Simple μPD1007 assembler and disassembler Internal 18kB ROM disassembly listing reconstructed by single stepping through the code External 32kB ROM dump and disassembly listing Method to access all memory and executing machine code - contributed by Samir Ribic FX-8000G emulator for Windows Service manual Circuit diagram of the FA-80 interface Description of the HD61710A01 interface chip used in the FA-80 Programming of the LCD controller The microprocessor μPD1007 is also used in the calculators FX-6000G, FX-7000G, FX-8500G.

Casio SF-9300

• Hardware description
• Description of the reverse engineered NM326/HD62076/μPD3055/uPD3055 microprocessor instruction set
• Simple HD62076/μPD3055 disassembler
• Partially commented diagnostic code disassembly listing
• Service manual for a similar model without card support SF-8350

The microprocessor HD62076/μPD3055 is also used in the calculators FX-7700G, FX-8700G.

Elektronika MK-90
ЭЛЕКТРОНИКА МК-90

This machine is no longer in my possession.

• Hardware description
• Internal data representation
• Description of the RAM cartridge
• Cartridge memory map
• Simple cartridge reader/programmer
• Assembly programming
• Partially commented ROM disassembly for the BASIC version 2.0 and the BASIC version 1.0, which appear to be derivatives of BASIC built in the ROM of the DVK-1 personal computer. The math routines are apparently based on the floating point library of the RT-11 operating system.
• MK-90 emulator for Windows
• Memory dump of a ROM cartridge SMP92-1 containing games and tutorials which can be launched on the emulator (version 09 or higher with BASIC 2.0 required) - contributed by Sergei Frolov.
  This video shows how the games look on a real machine.
  Individual games extracted from the SMP92-1 module which can be programmed into ordinary MPO-10 cartridges and played on a real MK-90 with any BASIC version.
  Partially commented disassembly listing of the loader and main menu.
  The game "chess" appears to be a graphical layer on top of the program chess.sav for the RT-11 operating system.

Elektronika MK-85
ЭЛЕКТРОНИКА МК-85

The design of this calculator is obviously based on the Casio FX-700P, but it appears to be an entirely different machine after all. It uses a 16-bit PDP-11 compatible microprocessor along with external RAM, program ROM and LCD controller. Such open architecture makes it an interesting object of hacking.

• Hardware description
• Internal data representation, BASIC program structure, memory map
• Algorithms
• Differences from Casio FX-700P
• Undocumented features, quirks and bugs
• Assembly programming
• Project of a mass storage device
• Partially commented ROM disassembly
• MK-85 font for Windows
• MK-85 emulator for Windows
• Source code for the modified ROM used in the MK-85 upgrade project

Miscellaneous

• Circuit diagram of the Casio FA-6 interface - the base unit and the head unit
• Casio FX-702P - table of character and keyword codes contributed by Mahmoud Yassine
• Programs
• Links
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• All recent updates of this web site including those not announced through RSS

Credits

I'm very grateful to all the people who shared my interests, collaborated in the projects, helped me to learn new things, or donated various items, especially: Mahmoud Yassine, BLUE, Miyura, Jacques Laporte, Marcus von Cube, Fuse, Xerxes, Stéphane Bourguinet, Julian, Henry Arias.

Warning! All information presented herein is result of my research, and therefore may be incomplete, inaccurate, or plain wrong. Use it at your own risk! All of the software on this site is in the public domain.

This web site is maintained by Piotr Piatek.