The imp004 is serial preprogrammed with the impOS. The imp004m requires an external 8Mbit (1MByte) to 128Mbit (16MByte) SPI flash programmed with the impOS image.
The impOS image is available for download from the Electric Imp website and uses the lower 776kBytes of the flash memory, leaving the memory above this available to user applications. Developers without the capability to load the image to a Serial flash can purchase these 64Mbit SOIC flash devices preprogrammed with the impOS image. These pre-programmed devices are intended to make prototyping quick and easy, while for production, your flash supplier or manufacturer should offer programming services.
Each package contains one imp004 Pre-Programmed Serial Flash device. The Pre-Programmed Serial Flash device measures 5.4 x 8.0 x 1.8 mm.
For more information, visit the Dev Center page.For orders over 10 units, please contact us for special pricing offers.