TRAKKER T2090 Hand-Held Batch Computer User’s Manual
7-8
Scrolling Text Lines with Attributes and Graphics
When scrolling either up or down, and graphics are on the display, the
graphics remains stationary relative to the scrolling text as long as the scrolling
attribute (BL) in INT 10h services 6 & 7 is set to 1. This allows you to preserve a
graphics image while text is scrolled around it. If a text line is scrolled up
which contains actual text in the location where the graphics image is
positioned, the graphics image will be overwritten.
Line attributes (normal, reverse, Double Wide and/or Double Height) move
with the text when scrolling lines either up or down. Please note, if the
application specifies line number 8 to be Double Height, only the top half of the
line is displayed on line 8.
Superimposing Text over Graphics
When the T2090 RESUMES after SUSPENDING, the LCD restores graphics
first, then text. If an application superimposes graphics over text in such a way
that individual characters are impacted, the result after a restore may be
different than expected. It is recommended that text be superimposed over
graphics, not visa versa.
Keyboard BIOS Support
Keyboard BIOS services are available in INT 16h.
All keyboard INT 16h BIOS services are supported. Note the keyboard has no
Caps Lock, NUM Lock, Scroll Lock, Alt, or Ctrl keys. Alpha keys are always
uppercase. Keys are actuated at initial closure and are repeatable. ENTER,
Backlight, left shift, and Function keys (F1 - F3) are not repeatable. Keys beep
only (if keyclick is on) at initial closure and when auto repeating.
The
×
Key is used as a toggle between Alpha and Numeric mode. This key is
reported through keyboard INT 16h function 2 as a left shift key and toggles
between being DOWN and UP, i.e. pressing it once, the key is considered
DOWN until the user presses it a second time, then it is UP. At reset and boot,
it is initialized to UP which corresponds to the ‘numeric’ mode. When left shift
key is DOWN, alpha keys are reported, once the left side or right side is closed.
When left shift key is UP, numeric and other center keys (-’.) are reported, left
side and right side is ignored. SPACE and BACKSPACE are always active.
The Function keys ARE NOT shifted when in ALPHA mode. The backlight key
is always a toggle between ON and OFF and is handled by the keyboard
scanner.
The ENTER key will report through keyboard INT 16 function 2 NUMLOCK
when key is DOWN and no NUMLOCK when key is UP for use in the user
controlled Laser scanning.
Содержание Trakker T2090
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Страница 231: ...Microsoft Visual C C Settings B ...
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Страница 234: ...TRAKKER T2090 Hand Held Batch Computer User s Manual B 4 Compiler Options Code Generation Select CPU 80186 80188 ...
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