Re: Apple ][gs VGA Card

[bazyar@netcom.com (Jawaid Bazyar)]

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

>Jawaid Bazyar (bazyar@netcom.com) wrote:

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

>Thanks for the reply. Does it mean that the standard 512K model can only
>handle 800 x 600 since 1024 x 768 will need 256 colours?

>Or is it possible to run 1024 x 768 at lesser colours so that it can be fit
>into 512K?

  Well, I was speaking purely of 256 color modes. Sure, you can run
1024x768x16 in 512K vram.

>Why 1MB if the maximum resolution (1024 x 768 x 256 colours) required only
>768K?

  The VGA chip can handle 16-bit wide memory, or 32-bit wide memory.
Not 24-bit wide :-)

>Is the 320 x 200 and 640 x 200 plain Super Hires, or are they new modes
>that support 256 colours? I supposed the later. Of course, the plain Super
>Hires with 16 and 4 colours are still supported.

  Yes, the latter, and yes, exsting SHR modes are supported just
by the video emulation.

>:   Nope, Zilog Z180. Same as on the RamFAST.
>What can this chip do?

  It's a general purpose processor.

>Any plan to talk to developers and programmers to come out with a series
>of applications that support Second Sight? You can already find 3 in
>Singapore. Talked to GS+ and SoftDisk yet? They might be impressed enough
>to come out with something... 

  Yes, we're contacting various developers to plug the board
and encourage them to support it.

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