Epson ActionLaser 1600 Service Manual page 87

Print data and commands transmitted from the host computer via parallel, serial,
or optional interfaces are read using the interrupt process of the CPU and stored
in the DRAM input buffer.
Data and commands in the input buffer are processed by the CPU, which then
stores the printing bitmap data (image data) in the V (video) -RAM (image buffer)
in the DRAM. The size of the V-RAM depends on the available DRAM size. A
"PRINT OVERRUN" occurs when the V-RAM is so small that the CPU cannot
process data faster than it is transmitted to the engine controller board. If such
an error occurs, increase the V-RAM using SelecType PAGE PROTECT.
The E05A91 transmits image data stored in the V-RAM to E05A92. The E05A92
changes the image data format from 32-bit parallel data to serial data, and stores
it in the internal temporary buffer. The temporary buffer has a capacity
equivalent to several lines. This is controlled by the E05A92, which synchronizes
and transmits the temporary buffer's data to the engine controller board.
Then the E05A92 manages BiRITech and EMGTech.
EPSON ActionLaser 1600 Service Manual
Figure 2-37. Data Flow Diagram
Principles of Operation
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