Command Prompt

[Justin W.]

If you want to shut down the calculator you can do this. It shuts off the LCD and sits in low power mode until you press ON again.

ld a,1
out (3),a
halt
res onInterrupt,(IY+onFlags)
ret

Make sure that interupts are enabled before running this routine.

[NETWizz]

[Adm.Wiggin]

go get TI-83 Plus Assembly in 28 Days from ticalc.org and it tells u all...

hope i was of service to u!

[NETWizz]

I know all of it, but still, it is not complete.

Do not misunderstand me, at times, I do have to look things up such as a rom call et cetera.

[SniperOfTheNight]

OK, thanks for all the help. I think I'm starting to understand all this. Any more questions I have I will post here ASAP. Thanks everyone

[Adm.Wiggin]

Glad we could help! A fellow programmer in need is like nature calling, well maybe not but hey, it sounded good to me!

[SniperOfTheNight]

I hate to be a pain but....... I'm having trouble,whats new. OK,i did what Jbirk suggested and l looked up Strings in the routines thing,and here's all I saw:

String Variables: Str1 ? Str0
These variables can only be type StrngObj.
They are all spelled with two tokens followed by one zero.
The first token of the name is tVarStrng, which labels it as a string variable name. The
second token signifies which predefined string name it is, tStr1 ? tStr0.
Example: String Variable Str5
OP1 +1 +2 +3 +4 +5 +6 +7 +8
StrngObj tVarStrng tStr5 00 ? ? ? ? ?
04h AAh 04h


First ofall..i don't understand the table,second of all,if some1 does understand,or if this is the wrong thing,please tell me.

[Adm.Wiggin]

you do have the right thing, but that is just the part that tells u what the variables are, u want the next tutorial i think, or is it the one after that? one of the two...

[SniperOfTheNight]

Well..the next part in the guide is about pictures. I'm using the sdk83pguide from Cirrus.

[Adm.Wiggin]

Well, then, I dunno... maybe this will help!


Equation, Program, AppVar, String
Two bytes with the number of bytes. Followed by a bunch of tokens. AppVars can contain any data you want.
$09 $00
tC tA tS tI tO tSpace tS tU tX
Probably string "CASIO SUX" (9 bytes...)


Input "Did that help? [y/n] ",Str0
If Str0="y"
Then
Disp "YAY!
Else
Disp "Then I'm sure stumped...
End

[NETWizz]

Okay, I will discuss programs sience that seems to be the last theme.

ld hl,text ;point hl to a label containing a string of data, the name
rst 20h ;Copy the string to OP1

bcall(_chkfindsym) ;look up the program

;de points to the size
;hl points to the symtable entry
;b is the flash page
;If the program does not exist, the Z flag will be set.

To check if it is in ram (unarchived) we must check to see what flash page it is on. Flash page 0 is ram.

ld a,b ;flash page to A
or a ;similar to cp 0
jr z,is_in_ram

;if not in ram, you can use bcall(_arc_unarc) and then look it up again.

Now, hl points to the symbol table we will ignore that for now.

de points to the size bytes with the lSB first.

inc de
inc de

;de will point to data.

You can use hl as the reference to the symbol table to unlock, lock, rename, et cetera.


;Data below
text:
.db "NAME",0

[Adm.Wiggin]

that was for programs, but it will apply the same for strings!

[SniperOfTheNight]

I could use that in my program. Thanks. I didn't ask that,but it still helped!

[Adm.Wiggin]

ohh, good! glad we can all be of service to a fellow programmer in need!

[Justin W.]

I just thought I'd add a little to JBirks post about programs, more in reference to the symbol table entry. The symbol table entry is written in reverse so you must dec hl to get to the nect byte of data required.

here is the order decrementing.

Objtype((1byte)$05 if unprotected,$06 if Protected)
Version (2bytes) ;means nearly nothing
Flashpage (1byte) the flash page the program is located on
Ram Address(2 bytes) location on page
length of programs name(1 byte) maximum of 8 characters
Name written backwards(1-8 bytes)

All objects have a symbol entry like this.

[Adm.Wiggin]

isn't there some enty that was reserved for future use or something? i dunno...

[Justin W.]

I'm not sure what you mean by that. All entries are the same and only differ slightly in the type of object.

[Adm.Wiggin]

ohh, it was just the second byte of the version that was reserved for future use by TI...

[NETWizz]

If you are interested in hiding programs, move your symbol table pointer to the first letter of the name.

Justin W told you where that is, but essentially, you move the pointer by -6 (if I remember correctly).

You can always check.

e.g.

look up a program

ld bc,-6
add hl,bc

ld a,(hl)
ld l,a
ld h,0
bcall(_disphl)

If you get a number larger than 8, you are past the name length.

A would be 65dec, B would be 66...

Now, if you wish to hide a program, subtract 40h when hl points to the first character.

The easiest way to do this is res 6,(hl)

[Adm.Wiggin]

that was some very good info about hidden programs... maybe i'll change my shell to display them as well! (use the symbol table, instead of _FindAlphaUp and _FindAlphaDn)