iza@ecs.umass.edu (11/29/90)
Can someone provide some additional information about the Unicorn Microelectronics IC UM-9203 (and UM-9204). Mouser Electronics catalog says DTMF receiver. Is it, by any chance, pin by pin compatible with the famous SSI203 (SSI204) ? Please email and I will post conclusions. Jon Iza W1/EA2SN iza@umaecs.bitnet iza@ecs.umass.edu