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United-TI Archives -> Calculator Tech Support
 
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Toksyuryel
Crimson Dragon Software


Elite


Joined: 14 Jun 2003
Posts: 880
Posted: 03 Feb 2004 08:25:09 pm    Post subject:
Adm.Wiggin wrote:
JACstudios_ceo wrote:
"ROM" means "read-only-memory". "WOM" means "Write-only-memory". The Flash on the calc is WOM, not ROM.

actually, you can read, but not write... you can archive, and then the ti-os writes, but you cannot write.

reading is fairly easy actually.

Have you ever been able to actually read off the archive? All the calc knows of items in the archive are whatever's in the VAT. Do you even know why it's called "archive"?
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X1011
10100111001


Active Member


Joined: 14 Nov 2003
Posts: 657
Posted: 03 Feb 2004 09:39:09 pm    Post subject:
Well it has to read the archive to make the VAT, and to unarchive things.
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Adm.Wiggin
aka Tianon


Know-It-All


Joined: 02 Jun 2003
Posts: 1874
Posted: 03 Feb 2004 10:48:43 pm    Post subject:
i have read from the archive...

how do you think MirageOS runs a prog from the Arc?

ok, so it copies it to RAM first, but that is besides the point Laughing
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Toksyuryel
Crimson Dragon Software


Elite


Joined: 14 Jun 2003
Posts: 880
Posted: 04 Feb 2004 07:58:38 pm    Post subject:
No it's not beside the point. The TI-OS (and you) only preforms the following functions on the archive: writing, deleting, and copying. The VAT is updated whenever one of those functions is carried out. It does not read off the archive to create the VAT. It's called an "archive" because that's what it is.
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Jeremiah Walgren
General Operations Director


Know-It-All


Joined: 24 May 2003
Posts: 1937
Posted: 04 Feb 2004 11:16:27 pm    Post subject:
ROM sounds slightly better than WOM... But I guess most people don't need to get very technical.
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X1011
10100111001


Active Member


Joined: 14 Nov 2003
Posts: 657
Posted: 05 Feb 2004 04:24:13 pm    Post subject:
Quote:
It does not read off the archive to create the VAT.

Then how does it re-do the VAT when the RAM clears?
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Toksyuryel
Crimson Dragon Software


Elite


Joined: 14 Jun 2003
Posts: 880
Posted: 05 Feb 2004 04:35:02 pm    Post subject:
I have no clue how it goes about doing that.
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DarkerLine
ceci n'est pas une |


Super Elite (Last Title)


Joined: 04 Nov 2003
Posts: 8328
Posted: 05 Feb 2004 05:36:51 pm    Post subject:
The RAM clear routine may not delete the VAT at all.
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Adm.Wiggin
aka Tianon


Know-It-All


Joined: 02 Jun 2003
Posts: 1874
Posted: 05 Feb 2004 06:25:33 pm    Post subject:
if you cannot read off the Archive, then how do you think MOS gets the data to copy to Ram? it doesnt use a bcall, that is for SURE!
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Toksyuryel
Crimson Dragon Software


Elite


Joined: 14 Jun 2003
Posts: 880
Posted: 05 Feb 2004 10:26:56 pm    Post subject:
It doesn't read. It simply copies. The VAT tells it what memory locations it's at, and then MOS simply coppies from those locations. No actuall "reading" is involved.
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Adm.Wiggin
aka Tianon


Know-It-All


Joined: 02 Jun 2003
Posts: 1874
Posted: 05 Feb 2004 10:38:46 pm    Post subject:
and how do you copy?

  1. store the byte to copy into a var like 'a'
  2. store that byte to the new location
  3. does the next byte
or, it just uses ldir Laughing (which is essentially the same thing...)

an app is run directly from its location in Flash, so any labels there used indirectly are reading strait from archive.
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DarkerLine
ceci n'est pas une |


Super Elite (Last Title)


Joined: 04 Nov 2003
Posts: 8328
Posted: 06 Feb 2004 05:42:02 pm    Post subject:
If you were unable to somehow read the ROM, you couldn't access the data there.
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Jeremiah Walgren
General Operations Director


Know-It-All


Joined: 24 May 2003
Posts: 1937
Posted: 06 Feb 2004 07:12:21 pm    Post subject:
Wouldn't the VAT need a way to know what's there in the archive? (Not an expert on the subject...) How could the VAT know what's in the archive if it can't be read?

Last edited by Guest on 06 Feb 2004 07:12:56 pm; edited 1 time in total
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X1011
10100111001


Active Member


Joined: 14 Nov 2003
Posts: 657
Posted: 06 Feb 2004 08:21:52 pm    Post subject:
It can be read.

Quote:
It doesn't read. It simply copies.

Copying is reading from one location and writing to another.
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