MODAC Copyright 1993 by Cornel Huth. All Rights Reserved.
MODAC1.EXE, 12-Mar-1993.


      MODAC. A shareware mod file player and digital VOC and WAVE file
      player/recorder. Continued use requires registration of $15, US
      DOLLARS ON US BANK. No Credit Cards. Pre-paid orders only. US
      Currency accepted for foreign orders. See the sign-on screen for
      order address.

      MODAC was written using my RUCKUS-DAC, with Mod extensions, sound library.
      Also available is RUCKUS-MIDI. The graphics is done with my QB/EVGFX,
      level 2, graphics library. The compiler used was Microsoft BASIC 7.1.
      The sound and graphics libraries are shareware, available for download
      on my BBS.

      The latest version Modac, and my other shareware products, may be
      downloaded from The Fortieth Floor BBS, 1(210)684-8065. 16 hours
      of operation: 17:00 to 09:00 Central Time.

      Minimum Requirements:

              IBM PC or compatible
              256K RAM
              DOS 3.0+
              VGA

              Note: See the Additional Notes at the end of this document.

      PC speaker can be used, as can an LPT-DAC on the first LPT port,
      the Disney Sound Source, the AdLib, the Sound Blaster and the
      Sound Blaster Pro. Recording requires either of the Sound Blasters.

      Additional Recommendation:

              IBM AT or compatible (for mod file playback, a 386/25+)
              1MB extended RAM
              XMS 2.0 (3.0+ required for XMS use under 386 memory managers)
              Mouse
              Sound Blaster Pro sound card


      Incompatibilities:

      Use of DOSMAX has been demonstrated to affect performance by as
      much as 50% in mod file playback. 386 memory managers have no
      noticable effect.

      Tandy 2000-series computers may have an incompatible timer chip.
      DMA-only operations should not be affected.

      -- This software was developed on an Intel 486/33, Symphony chipset,
      using the Sound Blaster Pro, and a Tseng VGA card w/ET4000AX.

      Bus-based mouse should not be using a Microsoft MOUSE.xxx driver in
      the version 7.xx. Use 6.xx or the 8.xx versions.

      Some 386 and 486 machines are unable to play Mod data when using both
      DMA and BG modes. Neither of my two machines are affected by this,
      but be aware that some machines will lock up when DMA+BG is used for
      mod file playback.

      Performance:

      Varies, depending on machine. DMA mode offers good across-the-board
      sound performance on VOC/WAVE data, regardless of CPU power. For
      TIMER-0 operation, the more CPU power, the better. AdLib digital
      output demands lots of CPU power.

      For mod processing, the best performance is achieved with foreground
      processing (BG disabled) and DMA processing. 45.5kHz processing rate
      is possible with a 486/33 and an SBPro. With DMA-BG processing, 40kHz
      is about it for a 486/33. In stereo, a mod process rate of 22.75kHz
      is no problem for a 486. If you've never heard a mod played in stereo
      using Modac and an SBPRO, you just haven't heard a mod played.

      You should be aware that over-taxing the machine when playing a
      mod may lock your machine up. Use the CPU RESERVES: status in the
      NOSCOPE scope window. If it doesn't say OKAY, you are over-taxing
      your system.

      The AdLib output level may be rather low so turn up your volume.
      For mod playback you should limit the rate to no more than 10kHz.
      13kHz tops.