Nspire Compatibility

Porting Richard Russell's BBC BASIC (Z80) to the TI-83+ and TI-84+ series calculators.

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bwang
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Nspire Compatibility

Post by bwang »

It seems that BBC Basic is almost compatible with the TI-Nspire in 84+ mode. So far the only issues I've found are that VDU 5 and several PLOT commands crash the Nspire. Is it possible to fix this?
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benryves
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Re: Nspire Compatibility

Post by benryves »

Do you know which instructions/features are not emulated? I don't have an Nspire to test, myself. :-(

There are four uses of sl1, which I believe is an unsupported instruction. Is it generally best to have a special Nspire version, or to use the same on all machines with a few wasted clock cycles in the 83+/84+ versions?

If the BBC BASIC interpreter itself uses unsupported features, there's nothing I can do about that.
bwang
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Re: Nspire Compatibility

Post by bwang »

It seems that most graphics commands and anything involving TIME$ don't work.
It would probably be best to have an Nspire version to keep things fast. How hard would it be to get rid of those four unsupported instructions?
darkstone knight
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Re: Nspire Compatibility

Post by darkstone knight »

sll is the same as scf\ rl

just 4 wasted clock cycles and a byte..
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benryves
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Re: Nspire Compatibility

Post by benryves »

I have spent a long, hard weekend slaving over the BBC BASIC source code trying to get it to work on the Nspire.
Or, to put it another way, I added .define sl1 scf \ rl to the first source file.

How does this perform? (See attached file).
Attachments
bbcbasic-z80-ti83p.2009.11.22.r765.zip
BBC BASIC revision 765
(40.9 KiB) Downloaded 653 times
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tr1p1ea
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Re: Nspire Compatibility

Post by tr1p1ea »

Oh snap! Damn NSpire for not including undocumented instructions!
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benryves
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Re: Nspire Compatibility

Post by benryves »

Well, I can only assume that's the problem. I don't have an Nspire to test against, which is why I'm hoping for some help in this. :(
bwang
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Re: Nspire Compatibility

Post by bwang »

It no longer seems to crash (at least everything that didn't work before works now).
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Re: Nspire Compatibility

Post by benryves »

Glad to hear it - let me know if you spot any other oddities! :) Thank you very much!
Galandros
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Re: Nspire Compatibility

Post by Galandros »

Nspire compatibility, great. Good update. :)
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Re: Nspire Compatibility

Post by toml_12953 »

Galandros wrote:Nspire compatibility, great. Good update. :)
How much free memory does BBC BASIC have on the Nspire? The same as on the 83?

Tom L
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Re: Nspire Compatibility

Post by bwang »

The same, since it is running on an 84+ emulator.
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Re: Nspire Compatibility

Post by bwang »

VDU 5 still crashes.
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benryves
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Re: Nspire Compatibility

Post by benryves »

How does it crash? Shortly/immediately after running the VDU 5 command, or some time after running another command in VDU 5 mode?

Does

Code: Select all

VDU 5:REPEAT:UNTIL.
crash when running, or only when you press On to break?
bwang
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Re: Nspire Compatibility

Post by bwang »

VDU 5 crashes immediately upon running, as does VDU 5:REPEAT:UNTIL
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