• On chip attributes logic
• Four modes of operation
Character mode without underline
Character mode with underline
• On Chip logic for double height double width characters
• Accepts scan line information in parallel or serial format
The UM8321 Video Attributes Controller (VAC) is an
n-channel MaS/LSI device containing graphics logic,
attributes logic, data and attributes latches, cursor control
and a high speed video shift register. A character generator
ROM and a CRT Video attributes controller UM8321
provide all of the major circuitry for the display portion
of a CRT video terminal.
The UM8321 serial video output may be connected directly
to 3 CRT monitor's video input.
The UM8321 attributes include: reverse video, underline,
character blank, character blink, and full/half intensity
selection. In addition. When used in conjunction with
the UM9007, the UM8321 will provide double height or
double width characters.
Four programmable cursor modes are provided on the
UM8321. They are underline, blinking underline, reserve
video character block, and blinking reverse video character
block. When used in the serial scan line input mode, the
cursor mode may be selected via two input pins. When
used in the parallel scan line input mode, the cursor mode
is a mask program option and is fixed at the time of
Two graphics modes are provided. In the wide graphics
mode, the UM8321 produces a graphic entity the size
of the character block. The graphic entity contains eight
parts, each of which is associated with one bit of the input
byte, thereby providing 256 unique graphic symbols. The
thin graphics mode enables the user to create thin line
drawings and forms.
• Four cursor modes dynarnically selectable via 2 input
Blinking reverse video
• Programmable character blink rate
• Programmable cursor blink rate
• On chip data and attribute latches
• +5 volt operation
• TTL compatible
• MaS n-Channel silicon gate
• Compatible with UM9007
In both graphics rnodes, continuous horizontal and vertical
lines may be drawn. Additional flexibility is provided by
allOWing the mask programming of the placement and
dimensions of the blocks or lines within a character block.
In the thin graphics mode, mask programming allows
serrated horizontal or vertical lines.