His DTMF decoder box uses a CM8870 DTMF decoder chip, which you might assume is all you need to get the job done. This chip performs its duties very well, ...

Nice project ! We did a lot of DTMF decoding “in the old ages”, with the 8870 chip (and others) with a C-64 and also via the PC joystick port and the Centronics parallel printer interface.

Cimarron Technologies Corp.'s C Plus II Display/Decoder has a single window display with a review of last 20 messages. ... MDC-1200, FleetSync, or DTMF compatible.

Cimarron Technologies ntroduces the VME-100 and the VMDE-200, two new plug-in ANI boards for Vertex standard radios. This is a true multi-format, plug-in encoder/decoder board ...