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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-700P

• Hardware description
• Internal data representation, BASIC program structure, file formats
• The FA-4 Cassette and Printer Interface
• 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 disassembly.
• 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

Casio PB-2000C

• Hardware description
• Partially commented internal 6kB ROM disassembly, extracted in a similar way as in case of the PB-1000.
• Partially commented external 64kB ROM disassembly (only the first half of the code so far, without the C interpreter).
• 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
• 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

• Description of the reverse engineered NM320/μPD1007/uPD1007 microprocessor instruction set
• Simple μPD1007 disassembler
• ROM dump and disassembly listing
• Method to access all memory and executing machine code - contributed by Samir Ribic
• Service manual

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 (it's a continuation of work started by Brad O'Dell)
• 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
  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

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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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.