The hardware
18
Because the 1902 has so many user-specified options (e.g.
choice of front end, high-pass and low-pass filter values, notch
filter frequency), an internal read-only memory is provided to
hold the characteristics of the options fitted and suitable names
(in English) for these options. This simplifies the task of any
controlling software. In the 1902 Mk IV, this memory is an area
of the flash ROM. Earlier models used a small EEPROM.
The operating system (the 1902 monitor) is run directly from
flash ROM. The flash ROM also stores the data needed to boot
up the microprocessor and configure the FPGA. As a
component of the 1902 processing core, flash ROM data is part
of the physical design, and subject to revision and upgrade.
Updating the firmware is done through an option of Try1902
(see page 46). As and when it becomes desirable to do so,
upgrade files will be offered as free downloads from CED’s
website,
www.ced.co.uk. Your current firmware version is
displayed, as the ‘monitor version’, in the Try1902 window.
Firmware – the
1902 flash ROM
Firmware upgrades
& the Internet
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