NEC Advanced Personal Computer System Reference Manual page 78

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Controller PCB
Table 3-4 GDC Symbols (cont'd)
SYMBOL
NAME
DESCRIPTION
MOD
Modify
Controls data that is accessed by
CODEW command or CODER
command.
RAD
RAM Address
RAD defines the RAM address that
stores the scroll address.
REC
Rectangle
REC
=
1 indicates that a rectangle is
being drawn.
S
Shrink
Affects line center (S
=
1).
SLO to SL9
Scroll Line
Controls scroll-line count.
SLA
Slant
Controls slant of text or drawing.
VBP
Vertical
Defines the amount of upper vertical
Back Porch
blanking time.
VES
Vertical Sync
Vertical sync occurs when VES
=
1.
VFP
Vertical
Defines the amount of lower vertical
Front Porch
blanking time.
3-13

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