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TS 800 User's Manual
draw:
Ihld
xchg
Ihld
mvi
rst
Ihld
xchg
Ihld
mvi
rst
ret
mousx:
mousy:
dw
dw
end
mousy
mousx
c,4
5
mousy
mousx
c,5
5
: Draw dot
0
0
; Mouse's current X-coordinate.
; Mouse's current Y-coordinate.
GRAPHIC CHARACTER FONT
Table 6-5 is a map of the graphic characters associated with each
ASCII character. The font is stored in the EPROM. Each cell of
the font can be individually accessed through the DRAWSTRING
function.
Internally, this is done as follows:
1.
The ASCII character sent by the USER through the DRAWSTRING
routine in Table 6-1 is used as an index into the graphics
character font as shown in Table 6-5.
2.
From the font, the graphics routines can access the bytes
that comprise the graphics character desired (as shown in
Figure 6-4).
NOTE I
Sixteen area fill styles have also been stored in the
FONT. These styles were stored in place of sixteen
non-printable control characters (as shown in Table 65) •
Table 6-5
Character Font
Contents
ASCII
Code
NULL
o
SOH
1
STX
2
ETX
3
Fill Style Index 0
Fill Style Index 1
TeleVideo Systems, Inc.
4
Description
Control codes
Half-tone patterns
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