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TITLE

	A2410EVD.LHA
	
VERSION

	Version 0.7
	
COMPANY

	Fourth Dimension Software
	1-420 Fenerty Court
	Kanata, Ontario, Canada
	K2L 3A9
	(613) 599-5379
	
AUTHOR

	Brian King
	Brian_King@software.mitel.com
	
DESCRIPTION

        This is an External Video Driver (EVD) for the ShapeShifter Mac
        emulator, which supports the Commodore A2410 8-bit Graphics Card.
        It allows 8-bit (256 colours) graphics for the Mac, and supports
        three types of screen-refreshing for optimal performance:
        - MMU refresh, where the 68040 MMU is used to indicate when a
          portion of the Mac's video frame-buffer (kept in standard Amiga
          memory) has changed.
        - Delta-buffer refresh, where two copies of the frame-buffer are
          kept in Amiga memory (double the memory requirements over MMU),
          and are compared.  Only the changes are copied to the A2410 card.
        - Dumb refresh.  The entire frame-buffer in Amiga memory is copied
          to the A2410 every refresh interval.
        All of these refresh modes require a Refresh in ShapeShifter, since
        the A2410 does not support direct video updates or drawing by the
        CPU or Mac emulation.  I've found that with MMU refresh on a 68040
        system, and using 640x480 gfx, and a Refresh of 5, that the
        following resulted:
            CPU: .932  FPU: 16.178  Gfx: .361
        I'm not sure how that compares to 16-colour AGA or ECS (or 256
        colour for that matter).

        Future versions will support the 68060 MMU (next release), as well
        as the 68030 MMU, plus optimized refreshes and performance.  Please
        register...
	
SPECIAL REQUIREMENTS

        ShapeShifter 3.2a or higher installed.
        Commodore A2410 graphics card.
        EGS-7.1 or higher.
        EGSA2410 driver by Juergen Schober.  Only tested with 2b16 (version
        2, beta 16) and 2b17.
        68040 for MMU-based screen refreshes (no 030 or 060 MMU support yet)
	
AVAILABILITY

	Any Aminet site, in pub/aminet/misc/emu directory.
        <ftp://ftp.wustl.edu/pub/aminet/misc/emu/A2410EVD.lha>
	
PRICE

	Shareware fee of $5 Canadian or US after 30-days of use.
	
DISTRIBUTION

	A2410EVD is shareware.  Freely distributable via CD, disk, FTP,
	or any other form.
	
	A2410EVD, )1994-1996 by Brian D. King, Fourth Dimension Software.

+-------------------------------------+-----------------------------------+
| Brian D. King  -  Computer Engineer | Fourth Dimension Software, author |
| PBX/ISDN Software Development Group | of LhA-GUI, and the Fusion-40 FAQ |
| Mitel Corporation, Kanata, Ontario  | ***** Brian_King@Mitel.com *****  |

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