7/14/2026 at 10:47:58 PM
by austinallegro
7/15/2026 at 11:06:23 AM
Leaning on the original ROM for PRINT/INPUT/FP math is what makes this faithful instead of merely functional, since you inherit the hardware's quirks instead of reimplementing the away. Instruction-level rather than cycle-accurate is also fine here; nobody's timing-attacking a 921 kHz BASIC pocket calc.by valentynkit
7/15/2026 at 6:28:34 AM
These Casio calculators were what we cared about in Portugal, about 40 years ago, TI was nowhere as relevant, and next level would be an HP 48 GX instead.I started with FX-4500P during high school, and later upgraded to a FX-880P during university, both still working.
By the way, you could get an additional 32 KB for the FX-880P, at a whooping price of 100 euros in today's money adjusted for inflation, talk about RAM prices.
Great work.
by pjmlp
7/15/2026 at 12:33:52 AM
Cool. Makes me wonder if anyone has made emulators of the Cassio and the like electronic dictionaries.by totetsu
7/15/2026 at 12:33:20 AM
Wooooot!I've got a Casio FX-850P (close enough: a bit less RAM and slightly less powerful processor but most program written for the 850 work on the 870) on my desk. I keep three old devices as witnesses of a (my?) glorious past on my desk at all times:
- Casio FX-850P
- ZX Spectrum
- Atari Portfolio (the one young John Connor uses to hack doors in Terminator 2)
I'd put more but the rest is too big to comfortably fit on my desk, so they stay in the basement.
Can't say I'm going to use that emulator but it's good to see some love and a few upvotes for that fine machine:
https://en.wikipedia.org/wiki/Casio_FX-850P
https://en.wikipedia.org/wiki/Casio_FX-850P#/media/File:CASI...
by TacticalCoder
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