User`s manual

Memory
Arrangements
Figure 1-1 shows elements involved in image data
flow. Note that three Image Memory configurations
exist and that Image Memory always contains com
-
pressed data. Ideally, hosts should send com
-
pressed data, which requires a compatible
compression algorithm. This can substantially re
-
duce the data transfer times of most image files.
Monochrome printers have no color buffers. Color
printers without Expanded Memory have single
color and monochrome buffers, requiring a print
pass after each color download for yellow,
magenta, and cyan data, and as stated previously,
the same operation for monochrome when black
and varnish require different bit-maps. In contrast,
Extended Memory makes possible single
downloads containing commands that specify the
contents of all five buffers. All P310 and P420
1-12 980081-001 Rev. F
Host Computer
:
Image Data
Compression
Algorithm
Image
Buffers
Image Data
Decompression
Algorithm
Print Head
Registers
CARD PRINTER
Bypassed
when Host
Compressed
Extended
Memory
Normal
Memory
Color
Buffer
Mono.
Buffer
Yellow
Buffer
Magenta
buffer
Cyan
Buffer
Black
Buffer
Varnish
Buffer
Color Card
Printers Only
Figure 1-1
Memory
Arrangements