Hello Bob, hello Eric,

>> This is supposed to have a V30 processor and Rom-Dos.  Haven't had time
>> to check it out thoroughly yet.
>> I should have asked if it can be installed by a clutz.
>> Specs on Wikipedia https://en.wikipedia.org/wiki/Casio_Algebra_FX_Series


Hi! Interesting question. This calculator has only 146 kB RAM
and only 256 kB of the ROM is reprogrammable flash. Also, the
display has very low resolution. You might be able to get some
workable solution by starting from Rayer's ROM OS approach, but
everything is very small in that calculator. So you probably
have to be really experienced to get it to work. And you have
very little space to add interesting files to work with, too.
http://www.rayer.g6.cz/romos/romose.htm


My guess is that the calculator does not have IBM-PC-compatible hardware
or even an IBM-PC-compatible BIOS (even RayeR's ROMOS assumes there is
such a thing).  This will likely be one of the main problems in getting
something like FreeDOS to work on the device.

Certainly the calculator's CPU may be compatible with that used on
machines that run DOS.  But the rest of the hardware --- including the
key input, screen output, and even serial communications (?) --- seems
very different indeed.  Meantime, without knowing more about its
internal workings, it is hard for me to say more.

Thank you!

--
https://github.com/tkchia


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