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Impiety


Newbie


Joined: 24 Mar 2011
Posts: 31
Location: Middle of nowhere
Posted: 04 Apr 2011 05:48:31 pm    Post subject: Empty Programs
While I was browsing through the VAT with CalcSys, I noticed that there were 2 'empty programs'. They were named '#' and '!', and both were deemed to be 0 bytes in size by CalcSys. I've never encountered such programs up until now, and I've never heard of such programs either. I've tried getting rid of them through a RAM clear, but they still appear in CalcSys.

Does anyone know what's going on here, or how to get rid of the programs?
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souvik1997


Guru-in-Training


Joined: 19 Apr 2010
Posts: 2870
Posted: 04 Apr 2011 05:49:43 pm    Post subject:
Those programs contain information like the homescreen entries. Don't mess with them unless you know what you're doing, or if you don't mind getting a RAM clear.
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Impiety


Newbie


Joined: 24 Mar 2011
Posts: 31
Location: Middle of nowhere
Posted: 04 Apr 2011 05:53:52 pm    Post subject:
Ah, thanks Souvik Smile. I first thought those programs were an offshoot of a glitch in my program.

I was about to delete them in CalcSys, but I guess I shouldn't now Smile
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KermMartian


Site Admin


Joined: 14 Mar 2005
Posts: 55762
Location: Earth, Sol, Milky Way
Posted: 04 Apr 2011 09:03:34 pm    Post subject:
Impiety wrote:
Ah, thanks Souvik Smile. I first thought those programs were an offshoot of a glitch in my program.

I was about to delete them in CalcSys, but I guess I shouldn't now Smile
Correct, you shouldn't. As Souvik accurately stated, they're used to store the previous entries and the current entry on the homescreen.
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Impiety


Newbie


Joined: 24 Mar 2011
Posts: 31
Location: Middle of nowhere
Posted: 04 Apr 2011 09:50:31 pm    Post subject:
Hmm... does this happen to have anything to do with the OS's interpreter? Wink My guess is that the TI-OS runs the contents of those programs through ParseInp when evaluating math expressions on the homescreen. Or maybe I'm just getting it all wrong... Smile
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KermMartian


Site Admin


Joined: 14 Mar 2005
Posts: 55762
Location: Earth, Sol, Milky Way
Posted: 04 Apr 2011 10:32:17 pm    Post subject:
Yup, that's more or less correct, Impiety. And of course that's where it gets the previous entries when you press 2nd-Enter on the homescreen.
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Impiety


Newbie


Joined: 24 Mar 2011
Posts: 31
Location: Middle of nowhere
Posted: 05 Apr 2011 10:03:37 pm    Post subject:
Wait, does the OS use an actual bcall for ParseInp, or does it do the context-switch thingy you were discussing in SAX?

Also, what the heck is a context switch, and more importantly, how is it implemented in z80?
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KermMartian


Site Admin


Joined: 14 Mar 2005
Posts: 55762
Location: Earth, Sol, Milky Way
Posted: 06 Apr 2011 12:58:24 am    Post subject:
Impiety wrote:
Wait, does the OS use an actual bcall for ParseInp, or does it do the context-switch thingy you were discussing in SAX?
You and the OS both do a bcall() to start executing a program using _ParseInp, which causes the OS to switch context, execute the program, then switch back. Keep in mind that a bcall() is mainly just a way to make an off-page call, nothing terribly super-special. It's less distinguished than a system call in the *nix/POSIX model.
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Also, what the heck is a context switch, and more importantly, how is it implemented in z80?
The TI-OS has a system it calls the Monitor that keeps track of the current context: running an App, executing a program, drawing a graph, etc. It's nothing like context-switching in a multitasking scheduler on a more complex device.
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