PiccoloSD64 external 24 bit video driver for ShapeShifter
                 1996 by Francesco Doro (fdorogpnet.it)
                              Public Domain


  SD64evd is an external video driver for the Macintosh emulator
ShapeShifter.  It supports only the 24/32 bit color mode of the graphics
board PiccoloSD64.

  This driver uses the internal blitter of the SD64 for the refresh; that
blitter is really powerful.

  A blitter done refresh gives the following advantages:

  - Speed: a 640x480 24 bit display takes 0.05 sec to be refreshed.

  - Doesn't need MMU.

  - It is CPU indipendent: the CPU has only to wait until the blitter
    finishes so the speed is the same on a 14 Mhz 68EC020 as on a 50 Mhz
    68060 (but only the refresh speed is the same...).

  - It is bus' bandwidth indipendent: the refresh speed is the same for a
    Zorro2 installed board as for a Zorro3 (again, only the refresh speed).

  - Doesn't need Amiga's memory: both virtual and real display resides on
    the board's video memory.


  ...But gives also this disavantage:

  - Since both virtual and real display must reside in the video memory, a
    2 Meg SD64 allows max a 640x400 24 bit display.


*** Requirements:

  Besides a working Amiga and PiccoloSD64, you need a registered and
correctly installed CyberGraphX and a recent version of ShapeShifter,
whether registered or not.


*** Features:

  At the moment SD64evd supports these screen modes:

  512 x 384 x 24 bit
  576 x 432 x 24 bit
  640 x 400 x 24 bit
  640 x 480 x 24 bit (only for 4 Meg SD64)
  768 x 576 x 24 bit (only for 4 Meg SD64)
  800 x 600 x 24 bit (only for 4 Meg SD64)
  832 x 624 x 24 bit (only for 4 Meg SD64)

  The assembly source is included.

 PERMSSN    UID  GID    PACKED    SIZE  RATIO     CRC       STAMP          NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
[generic]                 1410    2456  57.4% -lh5- 1d91 Jun  3  1996 SD64evd
[generic]                 3733   12809  29.1% -lh5- a60c Jun  3  1996 SD64evd.asm
[generic]                 3280    7584  43.2% -lh5- 0c74 Jun  3  1996 SD64evd.doc
[generic]                  936    1540  60.8% -lh5- 425d Jun  1  1996 SD64evd_TEST
[generic]                 2465    8219  30.0% -lh5- 5839 Jun  1  1996 SD64evd_TEST.asm
[generic]                  356     725  49.1% -lh5- 5b66 May 31  1996 SD64evd_TEST.doc
---------- ----------- ------- ------- ------ ---------- ------------ -------------
 Total         6 files   12180   33333  36.5%            Jun  5  1996