I have one just like it someplace. NFS Dwight

On Wed, 10 Jul 2013, Ethan Dicks wrote: "A Build It Yourself Modem For Under $50" Byte August 1980 (Reprinted in "Ciarcia's Circuit Cellar : Volume III", which HAS BEEN CLAIMED, FPUIB) Carterphone V Western Electric (SCROTUS) did over-ride TPC policy to permit direct connect modems. Carterphone was essentially bankrupted by the legal costs. AT one time, there was a leaked DOJ memo suggesting that if Carterphone closed, it could help anti-trust litigation. But, Carterphone stayed around on the edge for many years, possibly due to anonymous cash donations.

As an aside, I beelvie the origianl 'modular telephone' cosnsisted of 5 parts : Handset Base unit Handst cable Line cable 4 pin plug to go into the wall socket The little 'modular conencotrs' -- 4p4c for the handset and 6p4c for the line were not intended to be used to unplug the telephone and move it somewhere else. The plug into the wall was a large 4 pin thing. Of course the arrangement didn't last for too long... Yes I remember it.... Some of the UK magazines published modem projects, but gerenally the direct-connect type - -by the time that such things would have been popular, plug-in telephones were common. Of course modems tehcnically had to be approved, but in genral provided you did no damage to the telephone system you could get away with homebrew devices. Many of thes projects were based o nthe AM7910 'World Chip/. One that wasn't was the 'Maplin Modem' (at the time, Maplin, who now sell mostlu consumer electronics devices, sold a much larger range of electronic components and published a magazine, kits for the projects were avaialbe modulaotr and an XR2211 for the demodulator. I still ahve a couple of bare PCBs for said project, sne day I really must build one for old time's sake. One curious requirement for UK modem approval was that the modem had to be incapable of gerneating Bell tones. This may still be the case. Certainly quite recent dial-up modems sold in the UK have the Bell modes disabled, which is a right pain for people line me who ant to use them on a private syste m to talk to American devices. Oh well... Which reminds me... There was a varily popualr commercial modem over here, a WS2000 or something. It was based on the AM7910, the opeateing mode was sleected by a rotary switch on the front panel. AS supplied, there was a pin insered to prevent the 4 positions corresponting to Bell tones from being selected. By removign the knobm, the nut and the washer you could remove this pin. Did anybody _not_ do that? -tony