Pocket Heaven

Dwedit · Posted: Sun Jun 10, 2007 10:34 pm Post subject: Working on ti83 emulator

I am working on a TI83 emulator.
It does not yet boot.
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tepples · Posted: Sun Jun 10, 2007 10:51 pm Post subject:

Planning on making a BIOS dumper too?
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Dwedit · Posted: Sun Jun 10, 2007 11:05 pm Post subject:

At least 10 bios dumpers exist already. No point to making a new one.
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Dwedit · Posted: Sun Jun 10, 2007 11:29 pm Post subject:

My IRQ code sucks, triggered an interrrupt immediately after returning from one.

EDIT: nope, turned out to be that the Z80 core decreases PC by 1 after executing a HALT instruction, and I hadn't made the IRQ checker check if it had just executed a halt instruction.
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Dwedit · Posted: Mon Jun 11, 2007 2:45 am Post subject:

Woot! It now runs the Bubble Bobble ROM.

Still doesn't boot TIOS yet. Now gotta add Keyboard support!
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Ethoscapade · Member Joined: 24 Jan 2005 Posts: 252

bubble bobble was without a doubt one of the more amazing labors of love to be released by the ti-83 homebrew community (?)

although, um, dwedit, wouldn't this be a bit more sensible on the DS?

FluBBa · Moderator Joined: 14 Feb 2004 Posts: 2047 Location: GBG

Looking good! Smile

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Covarr · Member Joined: 07 Jan 2006 Posts: 736

The touchscreen would be absolutely perfect for emulating the calculator's buttons, but as far as I know the GBA is plenty powerful enough other than that. Perhaps it would be limited to TI-83 games, the majority of which use almost the same control scheme anyway.
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Dwedit · Posted: Mon Jun 11, 2007 6:48 pm Post subject:

I'm pretty sure anyone could come up with a better Skin. It needs to be 144x160 for now, and legible.
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mog123 · Member Joined: 08 Jan 2006 Posts: 691 Location: Poland

dwedit, you da man.
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Dwedit · Posted: Tue Jun 12, 2007 4:13 am Post subject:

Woot!

The culprit behind the failures? Messed up ld rr,(nnnn) instructions. Loaded the first byte correctly, failed to load the second.
Happened because there was SMS emulation cruft hiding in there. Was treating the first byte using the correct memory map, then assumed the second byte had a different memory map where the top 6 bits were used in the memory map table instead of the top 2 bits.
That's what happens when you change the memory mapping code... You get this crap because you searched for the word "memmap_tbl", and missed the single usage in readmem16 which did not explicitly use that keyword.
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Gunnex · Posted: Wed Jun 13, 2007 8:55 pm Post subject:

Oh yay!
Now people can't say s*** when I use a GBA as a Ti-83+.
Will there be a GBAMP version or will there be RAM issues?

dantheman · Posted: Sun Jun 17, 2007 2:18 am Post subject:

Heh, so you were serious about this when you mentioned it several months ago. Sweet!

For the skin, it might be easier to use capital letters for the buttons to aid readability. It's just an idea though.

Dwedit · Posted: Sun Jun 17, 2007 6:23 pm Post subject:

Ran into a problem with the memory mapping again, ld ix,(nnnn) was incorrectly using the SMS memory map instead of the correct memory map.

Even created another thread where I thought something else was the problem and complained about it, deleted that thread.
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Covarr · Member Joined: 07 Jan 2006 Posts: 736

Oh how nice it would be if TI-83 and SMS handled memory in the same way. Alas, their lack of cooperation with each other has pushed Dwedit into a life of hardships and suffering.

But wait, Dwedit is a good programmer, so this will have no long-term effects on his work! Yay Dwedit!
_________________
My Rig:
M3 + 256MB Kingston miniSD
CycloDS + 8GB Transcend microSDHC
EZ-Flash V 3-in-1

Final Fantasy VII (PC Version) is not dead!