GEM80-400
5. Central Highway & Fast I/O Modules
Issue 3 04/99
ALSPA GEM
80-400 SERIES CONTROLLERS TECHNICAL MANUAL
Page 5-9
5.7.2. L-Data
Table
The display is controlled by the content of the L-table (see Table 5.1) and the
controller writes data to the L-table to select the required display. The video
processor outputs one picture at a time and each picture can be divided into
four formats. When displaying more than one format on the screen at the same
time, they may overlap. When this occurs a format called by a higher L-table
number will overwrite any format called by a lower L-table number where it
overlaps.
Details that are outside the screen area can be included when programming
the definition of a format. By using a WINDOW command, any particular
rectangular area that has been defined can be selected to appear on the
monitor screen. If the formats being displayed at any particular time do not fill
the complete area of the screen, the unfilled area continues to display
whatever was previously called up. This could, when first using the system, be
part of the IMAGEM default format.
Formats are defined using the IMAGEM Display Language, which uses easily
remembered English keywords. Apart from instructions affecting the
presentation (e.g. sizes and colours), each format will normally consist of text
(including both letters and numbers) and graphic constructions.
Table 5.1 - L-Table
Location
Function
L0 to L3
IMAGEM 0 display formats, L0 = format 1, L1 = format 2, L2 =
Format 3, L3 = format 4
L4 to L7
IMAGEM 1 display formats, L4 = format 1, L5 = format 2, L6 =
format 3, L7 = format 4
L8 to L11
IMAGEM 2 display formats, L8 = format 1, L9 = format 2, L10 =
format 3, L11 = format 4
L12 to L15
IMAGEM 3 display formats, L12 = format 1, L13 = format 2, L14 =
format 3, L15 = format 4
L16
Screen update counter for IMAGEM 0
L17
Write status information for IMAGEM 0
L20
Screen update counter for IMAGEM 1
L21
Write status information for IMAGEM 1
L24
Screen update counter for IMAGEM 2
L25
Write status information for IMAGEM 2
L28
Screen update counter for IMAGEM 3
L29
Write status information for IMAGEM 3
Remainder of L-
table
Used to transfer data from IMAGEM to processor
5.7.3.
Connecting Video Monitors
Figure 5.2 shows an IMAGEM Processor Module. The front panel shown has four
outputs, three outputs to drive a colour monitor (RGB) and a composite sync.
output which must be used to ensure correct synchronisation of colour monitors
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