DPS unit numbers broken down?

[sudsyjkh]

HI all: there used to be an item on the DPS database entry describing each of the 4 digits in a unit number.
I know the first digit is the region [I.e 5 for the Lubbock region].
I know the second digit is the sub-region [i.e. 6 for Abilene] but the last two digits?
Also, I've heard reference to 8xxx units, I thought there were only 6 or 7 regions now?
And is there a list of sub-regions?
Thanks all.
HI all: there used to be an item on the DPS database entry discribing each of the 4 digits in a unit number.

 

[nd5y]

It got moved to the wiki Talkepartment of Public Safety (DPS) (TX) - The RadioReference Wiki
But it hasn't been updated since the renumbering in October.

There is also this post: http://forums.radioreference.com/texas-radio-discussion-forum/166013-texas-dps-re-numbering.html