Secret PRGM list? (TI 83+), Is it possible?

Foppah · Post by **Foppah** » Wed 07 Dec, 2005 6:10 pm

Anyone now a program that makes a secret PRGM list for TI83+?

Like press "Left arrow then PRGM" to show your secret program list.

(I have try MirageOS and other shells, but I wan't a "faster and easier" solution.)

Timendus · Post by **Timendus** » Wed 07 Dec, 2005 6:31 pm

Write one yourself

Any program name starting with a character ascii code <33 doesn't show up in the PRGM menu (or so I heard) so you just have to write a few tools to
a) change a program name to make it's first character a space (or lower character)
b) change it back
c) display all programs with that special first character, and enable you to run them

Post by **benryves** » Wed 07 Dec, 2005 6:34 pm

You could also modify the first byte of the VAT name entry (swap the $05/$06 header byte for something invalid), which would not have the consequence of damaging the name.

Foppah · Post by **Foppah** » Wed 07 Dec, 2005 6:47 pm

Timendus wrote:Write one yourself

Any program name starting with a character ascii code <33 doesn't show up in the PRGM menu (or so I heard) so you just have to write a few tools to
a) change a program name to make it's first character a space (or lower character)
b) change it back
c) display all programs with that special first character, and enable you to run them

I like your idea. In Graph Link or explorer I can't rename anything to ascii code?

benryves:
"You could also modify the first byte of the VAT name entry (swap the $05/$06 header byte for something invalid), which would not have the consequence of damaging the name."
I don't understand this one..

Post by **benryves** » Wed 07 Dec, 2005 7:16 pm

Foppah wrote:benryves:
"You could also modify the first byte of the VAT name entry (swap the $05/$06 header byte for something invalid), which would not have the consequence of damaging the name."
I don't understand this one..

The program name is held in the VAT (variable allocation table) of the calculator as a 9-byte block. The first byte tells you what sort of variable it is (6 for locked program, 5 for editable program, etc). By changing this to an invalid number, the TIOS will get confused and not display it. The other 8 bytes are the variable's name, padded with NULs (0). You could, for example, change your program to an AppVar very easily without danger.

Timendus · Post by **Timendus** » Wed 07 Dec, 2005 7:47 pm

Yes, that's even better. I'm not sure if "[2nd][+]>>Delete>>All" wouldn't show the programs then though.

The only problem with this kind of programs is always that you can't hide the program to hide/unhide programs, because you'd need it to unhide itself

Foppah · Post by **Foppah** » Wed 07 Dec, 2005 8:10 pm

Timendus wrote:Yes, that's even better. I'm not sure if "[2nd][+]>>Delete>>All" wouldn't show the programs then though.

The only problem with this kind of programs is always that you can't hide the program to hide/unhide programs, because you'd need it to unhide itself

Haha... yes that's the tricky part.....

Post by **Dwedit** » Wed 07 Dec, 2005 8:20 pm

Then there was "NOPROGS" on the TI82 which hid all programs when you press LEFT+RIGHT, then un-hides them afterwards.
It had a side effect: Any programs created when all were hidden became hidden when you un-hid the rest, then came back again when you hid them again. So hiding was more of a toggle switch.

Something Like that is what you're after?

Foppah · Post by **Foppah** » Wed 07 Dec, 2005 9:05 pm

Dwedit wrote:Then there was "NOPROGS" on the TI82 which hid all programs when you press LEFT+RIGHT, then un-hides them afterwards.
It had a side effect: Any programs created when all were hidden became hidden when you un-hid the rest, then came back again when you hid them again. So hiding was more of a toggle switch.

Something Like that is what you're after?

Yes, that's exactly what im after... I have google for one but didn't find anything.

Timendus · Post by **Timendus** » Wed 07 Dec, 2005 9:32 pm

How does that check for

+

to be pressed? A hook of some kind? An interrupt?

KermMartian · Post by **KermMartian** » Wed 07 Dec, 2005 11:57 pm

It's an interrupt, I used to have this on my 83, and it did indeed act like a toggle switch.