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Epson Research and Development
Page 123
Vancouver Design Center
Hardware Functional Specification S1D13505
Issue Date: 01/02/02 X23A-A-001-14
9.1 Image Buffer
The image buffer contains the formatted display mode data – see
“Display Mode Data Formats”
.
The displayed image(s) could take up only a portion of this space; the remaining area may be used
for multiple images – possibly for animation or general storage. See “Display Configuration” on
page 124 for the relationship between the image buffer and the display.
9.2 Ink/Cursor Buffers
The Ink/Cursor buffers contain formatted image data for the Ink or Cursor. There may be several
Ink/Cursor images stored in the display buffer but only one may be active at any given time. See
“Ink/Cursor Architecture” on page 133 for details.
9.3 Half Frame Buffer
In dual panel mode, with the half frame buffer enabled, the top of the display buffer is allocated to
the half-frame buffer. The size of the half frame buffer is a function of the panel resolution and
whether the panel is color or monochrome type:
Half Frame Buffer Size (in bytes)= (panel width x panel length) * factor / 16
where factor = 4 for color panel
= 1 for monochrome panel
For example, for a 640x480 8 bpp color panel the half frame buffer size is 75K bytes. In a 512K byte
display buffer, the half-frame buffer resides from 6D400h to 7FFFFh. In a 2M byte display buffer,
the half-frame buffer resides from 1ED400h to 1FFFFFh.