Exactly... JTAS #22 (CT) has them available at TL 14, although without any integral memory storage.
At this TL, they are purely links to external computers, with a "wireless" range of 1km max (line-of-sight, no obstructions). Range is greatly reduced depending on building structure, etc. However, any data-capable communications device may be used to extend the range for use of the link, you just set it up as for any other computer-computer communications link.
Any world of TL 10+ has a sufficient sattelite/cell-phone tech to allow use of the implant with that communications network (although a "translator" unit may be required due to local opsys architecture).
Cost is 10Mcr for the implant (installed), and 2Mcr more for the remote com link (installed)... otherwise an implant must be "jacked in" with a physical connection.
I would expect TL 15+ to start seeing integral memory capacity.
I agree that the "Ansible" should be dispensed with entirely, but virtually all other aspects of the series fits in well with Traveller, and can add much "flavor" to background for settings and adventures.