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Text File  |  1986-10-30  |  4KB  |  84 lines
  1.                                
  2.           WAITASEC (and SCROLL)                  Charles Petzold
  3.           Command(s)                                      No. 34
  4.  
  5.           ______________________________________________________
  6.  
  7.           Purpose:  Uses the single-keystroke ScrollLock key to
  8.                     halt a fast-scrolling display; then allows
  9.                     you to scroll backwards, recalling previous
  10.                     screens.
  11.  
  12.           Format:   WAITASEC     (loads memory-resident program)
  13.                     <ScrollLock>             (activates command)
  14.  
  15.           Remarks:  WAITASEC is a memory-resident program that is
  16.                     normally loaded through your AUTOEXEC.BAT
  17.                     file.  Thereafter, alternately pressing and
  18.                     releasing the ScrollLock key will halt and
  19.                     restart a scrolling display, e.g., a lengthy
  20.                     DIR listing.
  21.  
  22.                     While holding down the ScrollLock key to
  23.                     freeze the display, if you also press one of
  24.                     the cursor movement keys (Home, Up Arrow,
  25.                     PgUp, End, Down Arrow, or PgDn), the display
  26.                     will not resume scrolling when you release
  27.                     the ScrollLock key.  Thereafter, the Up and
  28.                     Down arrow keys move the display by one line,
  29.                     the PgUp and PgDown move it by 25 lines, and
  30.                     the Home and End keys take you to the
  31.                     beginning and end of the stored screen
  32.                     memory.  Pressing any non cursor key at this
  33.                     point deactivates the stored mode, and the
  34.                     original scrolling resumes.
  35.  
  36.                     Notes:
  37.  
  38.                     1.   WAITASEC will not work with an 80-column
  39.                          color/graphics display if an unmodified
  40.                          PC-DOS ANSI.SYS has been loaded.  (The
  41.                          ANSI.SYS that comes with various
  42.                          versions of MS-DOS does not cause
  43.                          problems with WAITASEC.)  To run with
  44.                          IBM's ANSI.SYS, make a copy
  45.                          (MODANSI.SYS) of the original ANSI.SYS
  46.                          and use DEBUG to patch the copy as
  47.                          follows:
  48.  
  49.                          DEBUG MODANSI.SYS
  50.                          E 29D 90 90
  51.                          E 2A1 90 90
  52.                          W
  53.                          Q
  54.  
  55.                          Put the modified MODANSI.SYS in your
  56.                          CONFIG.SYS file in place of ANSI.SYS.
  57.  
  58.  
  59.  
  60.  
  61.  
  62.                                  Page -2-
  63.  
  64.                     2.   Because of the way they handle TTY
  65.                          output, certain EGA cards will not
  66.                          permit WAITASEC to scroll backwards.
  67.                          This problem can often be cured by
  68.                          adding MODANSI.SYS, as above.
  69.  
  70.                     3.   WAITASEC does not save your current
  71.                          display screen.  To save your current
  72.                          display, before beginning a scroll,
  73.                          enter the complementary SCROLL command,
  74.                          and everything on the screen will scroll
  75.                          off the top and be captured in the
  76.                          WAITASEC buffer.
  77.  
  78.                     4.   While WAITASEC has been found compatible
  79.                          with XyWrite III (XYKBD.COM loaded) on a
  80.                          PC AT, as with other memory-resident
  81.                          programs, unforeseen hardware and
  82.                          software incompatibilities may be
  83.                          encountered.
  84.