there u go :

1 > 84+se with viewscreen slot
2 > S-0404 (a true rolls royce =])
3 > no
4 > 2
5 > yep
6 > 44
7 > 0F
8 > 04C4
9 > 000000

Fascinating! Those numbers suggest that the boot sector is hard-locked on that unit. Yet, another TI-83+ owner said that his boot sector wasn't locked. If it's really a a unit from 1999, then TI has substantially changed the TI-83+'s hardware since then (but, we already knew that). This means that TI used the flash chip's locking feature before moving to the ASIC. Now, it's the ASIC itself that handles locking. More experimentation on newer units is clearly called for.

Also, speaking of newer units, while I'm glad that older members of the community with older units are active during the summer, it's the transition between 128 K of RAM and 48 K that I'm most interested in. So, let's get information on some newer models.

Here's the data so far:
Known manufacturer IDs are

ID Manufacturer
01 AMD
04 Fujitsu
7F Unknown
C2 Unknown

Known device IDs are

ID Device
23 512 K (4 megabit) (old units)
B9 512 K (4 megabit) (new units)
C4 2048 K (16 megabit)
DA 1024 K (8 megabit)


Data Chart

Note: VS = ViewScreen

Model HW Bad LCD V# All RAM Port 15 Port 3A Chip ID Boot Owner
84+SE S-0605D No 2 Yes 45 00 04C4 000000 Me
84+SE S-0404 No 2 Yes 44 0F 04C4 000000 Runer112
84+ S-0406F Yes 2 Yes 45 00 01DA 000000 Eeems
84+SE P-0508M Yes 2 No 55 00 01C4 000000 thepenguin77
84+SE P-0510O Yes 2 No 55 00 7FC4 000000 thepenguin77
83+ S-0508K No 2 N/A 00 N/A 01B9 000045 Juju
84+SE S-0606F No 2 Yes 45 00 01C4 000000 graphmastur
84+ K-0207E No 2 Yes 45 00 C2DA 000000 ZippyDee
84+SE S0306-F 10h 2 Yes 45 00 01C4 000000 BuckeyeDude
84+SEVS S-1204A No 2 Yes 44 0F 04C4 000000 JosJuice
84+SEVS S-0404 No 2 Yes 44 0F 04C4 000000 the_mad_joob
83+VS I-0299A Yes 2 N/A 15 No 0123 010146 the_mad_joob

@Runer112 :

Could you please tell if you have a viewscreen slot at the back of your model ?
Because if yes, there's a chance port 3A would be related to this additionnal hardware piece.
Nothing sure yet, since my 83+VS ouputs a "No" on that part of the test...

Thx in advance =]

That's because yours is an 83+.  It outputted "No" because that test is not conducted on an 83+/83+SE.

Edit:  ZippyDee has a K.     (I was hoping we could do some tests on those.  (My opinion is those are "refurbished" calcs, i.e. calcs that were returned to TI as defective and then fixed and redistributed.  I have no hard evidence to prove that, but it's my theory anyway. )

I think we figured out port 15h.

On the non 83+:
   Port 15 is split up into two fields, the high nibble and the low nibble.
High nibble:
   4 - Calculator has full ram
   5 - Calculator is missing ram
Low nibble:
   4 - Port 3A is 0F
   5 - Port 3A is 00

Of course the high nibble also means which ASIC you have, but I don't know what those are called.

Edit:
   Wait a second, changed low nibble. When we figure out what 3A means, then we can finish this.

Edit2:
   the_mad_joob: Your calculator does not have a port 3A , so it can't display the correct number.

ZippyDee has a K.     (I was hoping we could do some tests on those.  (My opinion is those are "refurbished" calcs, i.e. calcs that were returned to TI as defective and then fixed and redistributed.  I have no hard evidence to prove that, but it's my theory anyway. )

Tests? I'd be happy to help with some tests...I didn't know my calc was special

Apparently, you can only actually write to the high-nibble of 3A, but when you write to the low one, it's ignored.  After writing 0xFF (Which ends up being 0xF0 because only the high nibble is accepted) and turning off my calc and then back on, it ends up being 0x60.

Runer does not have a view screen adapter, which means that port 3A refers to a different USB hardware revision.

Here is what I put on WikiTI

[ wikiTI]
This port reports the ASIC version from which the number of ram pages and USB driver revision can be determined. On the 83+, it does something different.

Read Values
    33 - TI-REF 83PL2M/TA2 - No USB driver and has 128KB of RAM
    44 - TI-REF 83PLUSB/TA2 - Uses old USB driver and has 128KB of RAM
    45 - TI-REF 84PLUSB/TA3 - Uses new USB driver and has 128KB of RAM
    55 - TI-REF 84PLC/TA1 - Uses new USB driver and has 48KB of RAM
Write Values
    No effect
[/ wikiTI]

I really have to thank critor back on that old thread on UTI or else I wouldn't have figured out the difference between 44/45.