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Using System Pics
This is an archived, read-only copy of the United-TI subforum , including posts and topic from May 2003 to April 2012. If you would like to discuss any of the topics in this forum, you can visit Cemetech's z80 Assembly subforum. Some of these topics may also be directly-linked to active Cemetech topics. If you are a Cemetech member with a linked United-TI account, you can link United-TI topics here with your current Cemetech topics.

This forum is locked: you cannot post, reply to, or edit topics. Z80 & 68k Assembly => z80 Assembly
Using System Pics
United-TI Archives -> Z80 & 68k Assembly
 
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Tyraniek


Member


Joined: 07 Jun 2003
Posts: 133
Posted: 08 Jul 2003 10:00:33 am    Post subject:
How could I use these pictures, as private pictures, for exemple :

picture:
.db 255, 0, 124, 255 etc. (96*64)

Can I simply replace
ld hl, picture

bu ld hl, pic1 where pic1 is
.db PictObj, tVarPict, tStr1, 0
?

So how could I use them by the same way that private pictures. I mean :

Code:
   B_CALL(_grbufclr)
   ld   hl, pub
   ld   de, plotsscreen
   ld   bc, 768     ; Définit le nombre d'octets à copier   (96*64)/8
   ldir    ; copie les octets
   B_CALL(_grbufcpy)


Thank you
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Job the GameQuitter


Member


Joined: 04 Jun 2003
Posts: 102
Posted: 08 Jul 2003 09:14:40 pm    Post subject:
No, what you need to do is search the Symbol Table (also known as the VAT) for a Pic 1 entry, then load the starting adress of the picture, LDIR.

Look up FindSym in the system routine document of TI and the Symbol Table entry of the SDK.
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Adm.Wiggin
aka Tianon


Know-It-All


Joined: 02 Jun 2003
Posts: 1874
Posted: 08 Jul 2003 10:32:18 pm    Post subject:
isnt findsym also the same as rst 10h or something?
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Job the GameQuitter


Member


Joined: 04 Jun 2003
Posts: 102
Posted: 09 Jul 2003 06:00:45 am    Post subject:
Whoop! Forgot to add that. Yeah, use RST 10h (make sure it's 10h and not $10) instead of bcall(findsym). It's functionally identical but it's faster and it saves a byte!
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Tyraniek


Member


Joined: 07 Jun 2003
Posts: 133
Posted: 09 Jul 2003 12:23:51 pm    Post subject:
Quote:
No, what you need to do is search the Symbol Table (also known as the VAT) for a Pic 1 entry, then load the starting adress of the picture, LDIR.


That was compact !!! What do you mean ?
What I should find in the symbol Table isn't .db PictObj, tVarPict, tStr1, 0 ??? And then, how do I have to use LDIR ? You mean, I just have to LDIR if I want to display it at the screen (with plotsscreen) ? If so, OK, I know how to do.

So, could you just explain me a little bit more what I have to do with checkfindsym (or RST 10h) ?
And I don't have the documentation you're talking about any more :-/


I hope, you'll help me !
Thank you Smile
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Job the GameQuitter


Member


Joined: 04 Jun 2003
Posts: 102
Posted: 09 Jul 2003 12:43:31 pm    Post subject:
You don't? Then get it man, you obviously have accest to the internet! Laughing There's a pinned thread, Good ASM tutorials. It has links to said documents.

Anyway, I'll copy the FindSym entry for you:

Code:
Inputs:
Registers:
(OP1 + 1) to (OP1 + 6) = variable name
See documentation on variable naming conventions.
Flags:
None
Others:
None

Outputs:
Registers:
CA flag = 1 if symbol was not found
= 0 if symbol was found
If symbol is found, additional outputs are:
ACC lower 5 bits = data type
ACC upper 3 bits = system flags about variable. Mask via “AND” with a
value of 1Fh to obtain data type only.
B = 0 if variable is located in RAM else variable is archived
B = ROM page located on
If variable is archived then its data cannot be accessed directly, it
must be unarchived first.
HL = pointer to the start of the variables symbol table entry
DE = pointer to the start of the variables data area if in RAM


So you would do

Code:
 ld hl, pic1

pic1:
.db PictObj, tVarPict, tStr1, 0
like you said, but you should add:
Code:
 ld hl, pic1
 rst 20h; This is the equivalent of Mov9op1
 rst 10h; look it up
 LD H,D
 LD L,E
 LD BC,768
 LD DE,gbuf
 LDIR
 B_CALL(_grbufcpy)
pic1:
 .db PictObj, tVarPict, tStr1, 0
I hope what I say is understandable.

PS: You don't need to clear the gbuf, because you're loading a new picture into it anyway.
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Tyraniek


Member


Joined: 07 Jun 2003
Posts: 133
Posted: 09 Jul 2003 01:47:16 pm    Post subject:
What you said is perfectly understandable.
Allright, that's what I wrote by reading the "Asm lessons in 28 days". (its author does quite the same thing, but with a list).


Code:
   ld   hl, pic1
   rst   20h
   rst   10h
   ex   de, hl
   ld   de, plotsscreen
   ld   bc, 768
   ldir
   B_CALL(_grbufcpy)


Then, I replaced "EX DE, HL" by your code, and it didn't work all the same :-/
Maybe it is because I wrote plotsscreen, but I didn't find any "gbuf" in the asm83p.inc file.
I add that when I say "it doesn't work", that means the picture is just not at the right place and is a little bit too much on the right.
I also wrote "Pic1" instead of "Str1", but anyways, both instructions are equal to "00h".
So what could be the cause of the problem ?

I add that I've created a pic and stored it as "pic1".
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Job the GameQuitter


Member


Joined: 04 Jun 2003
Posts: 102
Posted: 09 Jul 2003 03:46:48 pm    Post subject:
gbuf=Ion equate for plotsscreen Laughing. And you should use EX HL,DE. I forgot about that instruction (stupid, stupid me!). As for you problem... maybe the first byte of a Pic object is a token, just like ASM programs start with a tAsmPrgm.

Try inserting an INC HL before using LDIR. Does it display the picture properly now? I'm just guessing here.
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Tyraniek


Member


Joined: 07 Jun 2003
Posts: 133
Posted: 09 Jul 2003 04:18:19 pm    Post subject:
Hey !

I wrote "inc hl" 2 times and now, the picture is well centered ! Thank you Job !

However, I don't think your instruction is right : EX HL, DE. We can only write EX DE, HL, but neverwind Very Happy (I'm trying to seem a good programer Razz )

Now, I may continue my program, but I'm first sleeping (my english teacher told me I could say that instead of "I will first sleep", but I don't think she was right ;-)

I thank you all, guys ! Smile
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Adm.Wiggin
aka Tianon


Know-It-All


Joined: 02 Jun 2003
Posts: 1874
Posted: 09 Jul 2003 04:35:25 pm    Post subject:
yes, u must go past the 2 size bytes (wasted space, since they are always the same!)
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Job the GameQuitter


Member


Joined: 04 Jun 2003
Posts: 102
Posted: 09 Jul 2003 08:01:58 pm    Post subject:
It's a bit weird, isn't it? The only thing that matters is the adress in the SymTable anyway, why the heck use tokens like that? I mean, I understand why to put a token in front of an ASM program, but other than that.
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