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Text File  |  1988-11-24  |  4KB  |  75 lines
  1.           WAITASEC (and SCROLL)                  Charles Petzold
  2.           ______________________________________________________
  3.  
  4.           Purpose:  Uses the single-keystroke ScrollLock key to
  5.                     halt a fast-scrolling display; then allows
  6.                     you to scroll backwards, recalling previous
  7.                     screens.
  8.  
  9.           Format:   WAITASEC     (loads memory-resident program)
  10.                     <ScrollLock>             (activates command)
  11.  
  12.           Remarks:  WAITASEC is a memory-resident program that is
  13.                     normally loaded through your AUTOEXEC.BAT
  14.                     file.  Thereafter, alternately pressing and
  15.                     releasing the ScrollLock key will halt and
  16.                     restart a scrolling display, e.g., a lengthy
  17.                     DIR listing.
  18.  
  19.                     While holding down the ScrollLock key to
  20.                     freeze the display, if you also press one of
  21.                     the cursor movement keys (Home, Up Arrow,
  22.                     PgUp, End, Down Arrow, or PgDn), the display
  23.                     will not resume scrolling when you release
  24.                     the ScrollLock key.  Thereafter, the Up and
  25.                     Down arrow keys move the display by one line,
  26.                     the PgUp and PgDown move it by 25 lines, and
  27.                     the Home and End keys take you to the
  28.                     beginning and end of the stored screen
  29.                     memory.  Pressing any non cursor key at this
  30.                     point deactivates the stored mode, and the
  31.                     original scrolling resumes.
  32.  
  33.                     Notes:
  34.  
  35.                     1.   WAITASEC will not work with an 80-column
  36.                          color/graphics display if an unmodified
  37.                          PC-DOS ANSI.SYS has been loaded.  (The
  38.                          ANSI.SYS that comes with various
  39.                          versions of MS-DOS does not cause
  40.                          problems with WAITASEC.)  To run with
  41.                          IBM's ANSI.SYS, make a copy
  42.                          (MODANSI.SYS) of the original ANSI.SYS
  43.                          and use DEBUG to patch the copy as
  44.                          follows:
  45.  
  46.                          DEBUG MODANSI.SYS
  47.                          E 29D 90 90
  48.                          E 2A1 90 90
  49.                          W
  50.                          Q
  51.  
  52.                          Put the modified MODANSI.SYS in your
  53.                          CONFIG.SYS file in place of ANSI.SYS.
  54.  
  55.                     2.   Because of the way they handle TTY
  56.                          output, certain EGA cards will not
  57.                          permit WAITASEC to scroll backwards.
  58.                          This problem can often be cured by
  59.                          adding MODANSI.SYS, as above.
  60.  
  61.                     3.   WAITASEC does not save your current
  62.                          display screen.  To save your current
  63.                          display, before beginning a scroll,
  64.                          enter the complementary SCROLL command,
  65.                          and everything on the screen will scroll
  66.                          off the top and be captured in the
  67.                          WAITASEC buffer.
  68.  
  69.                     4.   While WAITASEC has been found compatible
  70.                          with XyWrite III (XYKBD.COM loaded) on a
  71.                          PC AT, as with other memory-resident
  72.                          programs, unforeseen hardware and
  73.                          software incompatibilities may be
  74.                          encountered.
  75.