ADSL USB modem, quite popular in Poland.
Single screw to open.
It is based on Unicorn II chipset from ST Microelectronics: ST70138 DMT engine and USB 1.1 controller and MTC20174 AFE (Analog Front-End: 12-bit 8.8Msamples/s DAC, 13-bit 8.8Msamples/s ADC, PGAs, filters, DCXO, PLL, line driver).
Atmel 93C66A: 4kbit SPI EEPROM
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