TI-83+ Link Protocol Guide - Getting OS & BIOS version

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OS & BIOS version

With the introduction of the Ti-Connect software, Texas Instruments have incorporated a new command which returns some version informations.

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#### Getting OS & BIOS version

Indeed, the request is like sending a TI84+ FLASH.

The protocol for silently receiving the clock is shown below:

Step | Direction | Packet
--- | --- | ---
1 |  |  |  | VER
2 |  | ACK
3 |  | CTS
4 |  | ACK
5 |  | DATA
6 |  | ACK

Example (PC requesting version):

PC: | `23 2D 00 00` | Request informations
TI: | `73 56 00 00` | Acknowledgement of REQ
PC: | `23 09 00 00` | Clear to send variable
TI: | `73 56 00 00` | Acknowledgement of CTS
| `73 15 0B 00 02 16 01 00 00 03 09 01 00 00 00 26 00` | Variable data: 11 bytes (OS: 2.22, BIOS: 1.00)
PC: | `23 56 00 00` | Acknowledgement of variable data

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The variable data has the following format (pure binary and/or BCD):

Offset | Length | Description
--- | --- | ---
0 | 2 bytes | OS version like 02 15 for 2.21
4 | 2 bytes | BIOS version like 01 00 for 1.00
6 | 1 byte | Battery level (00 = good, 01 = low, 02 = ???, 03 = low)
7 | 1 byte | Model / HW version (0 = TI83+, 1 = TI83+ SE, 2 = TI84+ ??, 3 = TI84+ SE)
8 | 2 bytes | Language ID (0x0901 for English)
10 | 2 bytes | Always 00 00
12 | 1 bytes | Always 00

#### Note : when calculator is waiting for OS arrival, any packet is rejected unless this one. But, it returns 0.00 as OS version.
Note : this packet seems to the same as TI9X hand-helds without the last 3 bytes.

Examples :
TI83+ : 01 0C 01 00 00 00 09 01 00 00 00 (VTi5b1)
TI83+ SE : 01 12 01 00 00 01 09 01 CE 20 20
TI84+ :
TI84+ SE : 02 16 01 00 00 03 09 01 00 00 00

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