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Text File  |  1988-06-23  |  4KB  |  81 lines
  1.           WAITASEC (and SCROLL)                  Charles Petzold
  2.           Command(s)                                      No. 34
  3.  
  4.           ______________________________________________________
  5.  
  6.           Purpose:  Uses the single-keystroke ScrollLock key to
  7.                     halt a fast-scrolling display; then allows
  8.                     you to scroll backwards, recalling previous
  9.                     screens.
  10.  
  11.           Format:   WAITASEC     (loads memory-resident program)
  12.                     <ScrollLock>             (activates command)
  13.  
  14.           Remarks:  WAITASEC is a memory-resident program that is
  15.                     normally loaded through your AUTOEXEC.BAT
  16.                     file.  Thereafter, alternately pressing and
  17.                     releasing the ScrollLock key will halt and
  18.                     restart a scrolling display, e.g., a lengthy
  19.                     DIR listing.
  20.  
  21.                     While holding down the ScrollLock key to
  22.                     freeze the display, if you also press one of
  23.                     the cursor movement keys (Home, Up Arrow,
  24.                     PgUp, End, Down Arrow, or PgDn), the display
  25.                     will not resume scrolling when you release
  26.                     the ScrollLock key.  Thereafter, the Up and
  27.                     Down arrow keys move the display by one line,
  28.                     the PgUp and PgDown move it by 25 lines, and
  29.                     the Home and End keys take you to the
  30.                     beginning and end of the stored screen
  31.                     memory.  Pressing any non cursor key at this
  32.                     point deactivates the stored mode, and the
  33.                     original scrolling resumes.
  34.  
  35.                     Notes:
  36.  
  37.                     1.   WAITASEC will not work with an 80-column
  38.                          color/graphics display if an unmodified
  39.                          PC-DOS ANSI.SYS has been loaded.  (The
  40.                          ANSI.SYS that comes with various
  41.                          versions of MS-DOS does not cause
  42.                          problems with WAITASEC.)  To run with
  43.                          IBM's ANSI.SYS, make a copy
  44.                          (MODANSI.SYS) of the original ANSI.SYS
  45.                          and use DEBUG to patch the copy as
  46.                          follows:
  47.  
  48.                          DEBUG MODANSI.SYS
  49.                          E 29D 90 90
  50.                          E 2A1 90 90
  51.                          W
  52.                          Q
  53.  
  54.                          Put the modified MODANSI.SYS in your
  55.                          CONFIG.SYS file in place of ANSI.SYS.
  56.  
  57.  
  58.  
  59.  
  60.  
  61.                     2.   Because of the way they handle TTY
  62.                          output, certain EGA cards will not
  63.                          permit WAITASEC to scroll backwards.
  64.                          This problem can often be cured by
  65.                          adding MODANSI.SYS, as above.
  66.  
  67.                     3.   WAITASEC does not save your current
  68.                          display screen.  To save your current
  69.                          display, before beginning a scroll,
  70.                          enter the complementary SCROLL command,
  71.                          and everything on the screen will scroll
  72.                          off the top and be captured in the
  73.                          WAITASEC buffer.
  74.  
  75.                     4.   While WAITASEC has been found compatible
  76.                          with XyWrite III (XYKBD.COM loaded) on a
  77.                          PC AT, as with other memory-resident
  78.                          programs, unforeseen hardware and
  79.                          software incompatibilities may be
  80.                          encountered.
  81.