TI-89 Link Protocol Guide

TI-89 Link Protocol Guide - Miscellaneous

Miscellaneous

This topic contains various stuffs introduced with Ti-Connect which can not be put at another place.

Ready / Status

The protocol for getting statuss is shown below:

Step	Direction			Packet
1				RDY
2				ACK with status

The 2 bytes after the MID & CID contains a status word. The status word may contain version information but this is unsure.
But, the bit #0 of the MSB contains status (0 = ready, 1 = not ready).

Creating a folder

In fact, Ti-Connect use an ersatz for this: it sends an empy var with full path like 'new_fld\a1234567' and next delete variable.

The protocol for silently creating a folder is shown below:

Step Direction Packet

1

DEL

2

ACK

3

ACK

Step	Packet
1		DEL
2	ACK
3	ACK

Example (PC creating a folder on TI):

PC:	`08 C9 00 17``00 00 00 00 00 0A 40 00 21 00 00 00 00 00 00 23 8E 00`	Variable header: "new_fld\a1234567"
TI:	`98 56 00 00`	Acknowledgement of header
TI:	`98 09 00 00`	Clear To Send
PC:	`08 56 00 00`
	.... See sending of vars
PC:	`08 92 00 00`	End Of Transmission
TI:	`98 56 00 00`	Acknowledgment of EOT

Deleting a variable

At first, Ti-Connect send a key sequence to returns to HOME : 010B (undocumented), 0108 (ESC), 0108 (ESC), 0108 (ESC), 0108 (ESC), 1108 (QUIT), 1108 (QUIT), 2051 (HOME), 0107 (CLEAR), 0107 (CLEAR), 0107 (CLEAR).

The next operation depends on AMS version; with AMS >= 2.09, it sends a command to delete variable. Else, it circumvent this by remotely typing DelVar 'varname' (see TI92 doc).

The protocol for silently deleting a variable is shown below:

Step Direction Packet

1

DEL

2

ACK

Step	Direction	Packet
1				DEL
2		ACK

Example (PC creating a folder on TI):

PC:	`08 88 00 0C``00 00 00 00 00 06 6D 61 69 6E 5C 78 7F 02`	Variable header: "main\x"
TI:	`98 56 00 00`	Acknowledgement of header

OS & version

Table of Contents

Variable Formats

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