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NovaJet 500/630/700 Series Service Manual
The system firmware is stored in Flash EEPROM. The Flash EEPROM allows the firmware to be upgraded by downloading the files containing the new firmware. It can be erased and reprogrammed more than 10,000 times. The term “Flash” means that bytes cannot be individually erased. A block or the whole device is erased at the same time and the block or whole device is then reprogrammed.
The normal method of downloading new firmware is to send the unit the files containing the code using either the GO.EXE utility or print- ing the file to the unit. This requires using an appropriate host utility and can be done through the serial port (for Macintosh users) or the parallel port (for PC users). See Firmware Downloading in Chapter 3 for the procedures.
DRAM
DRAM is Dynamic Random Access Memory which provides temporary storage of the microprocessor calculation and input/output data. It is also a faster type of memory then the Flash EEPROM. That’s why the printer control program is also copied from the Flash EEPROM to RAM, where it can be executed faster.
The printer also has two
The SIMMs must have a minimum operating speed of 70ns, and conform to JEDEC Standard
THEORY OF OPERATION
Theory of Operation |