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Segment LCDs are usually small monochrome devices made out of glass, that have the benefit of using very little power in their operation. Most importantly, however, it repurposes the watches original segmented monochrome LCD. It kits out the 33-year-old watch design with a modern, low-power ARM Cortex M0+ microcontroller running at 32 MHz that completely revolutionizes what the watch can do. got his start hacking on these displays via his Sensor Watch project – a board swap for the venerable Casio F-91W wristwatch, with the project now available on CrowdSupply. talk is a great way to learn the skills needed to reverse engineer a typical segment LCD. decided that he could get more out of these displays with a little tinkering, and rocked up to Remoticon 2021 to share his findings. They’re perhaps most familiar to us from their use in calculators and watches, where they still find regular application. Segmented liquid crystal displays are considered quite an old and archaic display technology these days.

Casio calculator emulator online software#

We can’t get enough of our calculator hacks here, so make sure to check out the CPU transplant on this vintage Soviet calculator.Ĭontinue reading “Old Casio Calculator Learns New Tricks” → Posted in classic hacks, Software Hacks Tagged assembly, calculator, casio, conways game of life, forth, game of life He also managed to get a version of Conway’s Game Of Life running, check out the video after the break. ended up porting a Forth interpreter, which defaults to RPN style, to finally achieve his humble objective. With RAM to burn, new routines were created to write custom characters to the screen, and a new font was created to squeeze more characters onto the display than normal. Here, the contents of RAM could be easily modified with custom code, then uploaded back into the calculator. With 32KB of RAM there ended up being plenty of room for experimentation, and uploading a program into RAM was simplified by using Casio’s original backup software to dump the RAM onto a PC.

Casio calculator emulator online code#

With the entire calculator emulated in software, the plan from here involved replacing one of the BASIC commands in ROM with new code that would jump to an address in RAM. Incredibly, the MAME framework already featured a ‘partial implementation’ of the calculator’s CPU, which was a much needed shot in the arm when it came time to write a full-featured emulator. The first step in cracking this calculator wide open was a ROM dump, followed by writing a disassembler. An RPN interpreter written in assembly language would be much faster. The calculator in question can already run its own version of BASIC, however the bespoke Hitachi CPU struggles performance-wise with complex programs, and wouldn’t be a realistic way of using RPN on the calculator.

Casio calculator emulator online upgrade#

Needing a project to keep him occupied, he decided to upgrade his 90s Casio CFX-9850G calculator to run custom machine code.Īll really wanted was for his vintage calculator to understand Reverse Polish Notation (RPN).

Casio calculator emulator online free#

recently found himself stung by the burden of free time while in lockdown. Posted in clock hacks, Wearable Hacks Tagged casio, Casio F91W, F91W, smartwatch

This is probably the most impressive F91 hack we’ve seen, but it’s by no means the first revamped Casio we’ve shown you. He admits that the software needs some work, but with hardware this well-executed we hope that others can contribute some improvements. This gives it a 15-day battery life, which is nothing like what the original watch would have but compares favorably to smartwatches. The brains comes courtesy of a Texas Instruments CC2640 BLE microcontroller. Now the simple classic timepiece is fully up-to-date!Īll the Casio internals are removed, and a new movement holder supports a fresh PCB with an OLED display mounted via a flexible sub-PCB. Wouldn’t it be nice if a Casio F91 could be a modern smartwatch! Well thanks to it can, with a complete re-engineering of the classic watch’s internals. If it has a flaw though, it’s that the functions of a watch from 1989 are very basic. The Casio F91 is the archetypal digital watch - it’s affordable, it’s been in production since the Ark, it does the job so well that it’s become a design classic, and it remains a very tough act to follow. They can produce the most advanced digital watches ever to grace the wrist, but their work will forever be associated with one of their more lowly creations. In a way, you have to feel a bit sorry for the engineers at Casio.