[TI-H] Building your own calculator


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[TI-H] Building your own calculator




As David Phillips told, there are some real problems to build a new
calc.
The IPaq idea is good, but it cuts a nice project in its root. I know
its a lot of work to build a calc even a simple one but I have made
several borads, the last one has a z180 at 7,16MHz a graphic LCD
(160x80) a keyboard and works fairly well.
But I have started with other approach because all the hardware was
emulated first and built later. My next project is to build a calc with
a H8/300H processor (Hitachi), so I started with a simulator running
under linux, it isn't finished yet, but is stable and works very well.
That can be a good point, first to simulate the hardware, to run
software, while we are developing the hardware.

I choosed the H8/300H because is cheap (us dollars 16, Euro 16), fast
(up to 25MHz), has a 16MB linear address sapce, there are good free
assemblers (gnu GAS) and the GNU GCC can produce high cuality code.
consult semiconductors.hitachi.com to check. And It can be bought by
Internet (I bought the z180 via Internet). But i haven't bought it yet.

I tryed to use a SH-1, but after several months I gave it up because
it's too complicated form me to use it effectively (check the
datasheets), not by any lack of knowledge but because the memory
interface. But I wrote a SH-1 simulator too, and works...

Thouse are only examples.

If anybody wants seriously to consider this project, rely on me because
I'm going to do it anyway (with a H8/300H) but any other processor could
be considered.
I know several types of assembler CISC and RISC, and C programming.
My electronics knowledge are fairly well.

Ale






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