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

Getting OS & BIOS version

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

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.

Clock

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