Re: Apple ][gs VGA Card

[bazyar@netcom.com (Jawaid Bazyar)]

ltchean@iss.nus.sg (Lim Thye Chean) writes:

>That means the card must have 1024 x 768 = 768K of memory. By the way, I
>assume this to mean:

  The card comes with 512K memory standard (so far). You can 
have up to 1MB of VRAM.

>320 x 200, 640 x 200 and 640 x 400 are all resolutions supported on Apple
>monitor only. The 640 x 400 are interlaced.

  Right so far.

>640 x 480, 800 x 600 and 1024 x 768 are for SVGA monitor. I don't think
>VGA supports 256 colours on 640 x 480 - only 320 x 200 MCGA mode.

  SVGA supports 640x480x256, and so does SS.

>I think most people will use only 3 of these modes (correct me if I am wrong):

>  * 320 x 200 x 256 colours: Fast pace arcade games. Need to run on both types
>                             of monitor.
>  * 640 x 200 x 256 colours: Works on both types of monitor, and NOT 
>                             interlaced.
>  * 1024 x 768 x 256 colours: Best.

>I don't see why there is a need for other modes.

  1024x768 is a LOT of memory to move around, even with a 20MHz
processor on board :-)

>:   The card's on-board processor can move data around at a furious rate.

>Good for writing arcade games. Is it a blitter chip?

  Nope, Zilog Z180. Same as on the RamFAST.

>: >- Any programming reference for it?

>:   Yes. There will be a "developer's bundle" that you can purchase,
>: that will contain detailed information on programming the board.

>Is it more expensive? Or cheaper (due to developer discount)?

  More expensive, I think, but we don't have firm details on this
yet.

-- 
 Jawaid Bazyar              |   Like UNIX? Like your Apple IIGS? Then ask
 Procyon, Inc.              |   me about GNO/ME for the Apple IIgs!   
 bazyar@netcom.com          |   P.O Box 620334
 --Apple II Forever!--      |   Littleton, CO 80162-0334   (303) 781-3273