[Hp48xgcc] [hp48xgcc - Open Discussion] RE: HP-GCC Project

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By: alborowski

Hi Alex, 

Glad to see you're still about :)

"How did the other project come about?"

As you may know, HP's new calculators are based on ARM processors. The 49g+
runs at 75MHz, and can actually be clocked up to 203MHz ion software. While
this sounds great, to allow older code to be used, the ARM has to emulate a
Saturn processor.

Of course, emulation has alot of downsides. Things are much slower then they
should be. Greyscale no longer worked properly, nor did alot of low level hardware
things.

To get around this, a few people figured how to escape the emulation, and run
ARM code directly. The HP-GCC project was formed because we felt C was an easier,
faster and more powerful language then emulated sysRPL / Saturn asm.

"Do you know if they used any code from hp48xgcc?"

I don't think so. I personally only became aware of your project a few days
ago. I don't think they share much common code - HP-GCC hasn't modified GCC
directly. Instead there are external programs an libraries to do the conversion.

"Is their stuff backward-compatible with HP48?"

Seeing HP-GCC spits out ARM opcodes, then no :-)

cheers,

Al


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