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- From: John_Shepardson.esh@qmail.slac.stanford.edu (John Shepardson)
- Subject: Re: Quadra 700 questions..
- Message-ID: <John_Shepardson.esh-270193134043@moose.slac.stanford.edu>
- Followup-To: comp.sys.mac.hardware
- Sender: news@unixhub.SLAC.Stanford.EDU
- Organization: Stanford Linear Accelerator
- References: <1993Jan27.182107.8777@ra.oc.com>
- Distribution: na
- Date: Wed, 27 Jan 1993 21:47:52 GMT
- Lines: 103
-
- In article <1993Jan27.182107.8777@ra.oc.com>, wier@merlin.etsu.edu (Dr.
- Robert R. Wier) wrote:
-
- > When you look at the memory slots, you'll see some sockets
- > in addition to the standard SIMM slots which are labeled
- > VIDEO SRAM - since the Quadra normally comes with 8 bit color/
- > b&w capability, what does filling these memory slots give you?
- > Increased speed? 24 bit color?
-
-
- Here is an old posting by the original Quadra video engineer:
- Hey Dale, think you might update us for the 950 and on?
-
- From: Dale_Adams@gateway.qm.apple.com (Dale Adams)
- Newsgroups: comp.sys.mac.hardware
- Subject: Mac Quadra Video Explained, Part 3
- Message-ID: <17887@goofy.Apple.COM>
- Date: 25 Nov 91 17:02:16 GMT
- Sender: usenet@Apple.COM
- Organization: Apple Computer, Inc., Cupertino, CA
- Lines: 81
-
- Macintosh Quadra Built-In Video, Part 3: VRAM Configurations
-
- This is the third in a series of articles which describes the capabilities
- of the built-in video of the Quadra 700 and 900.
-
- The Quadra frame buffer supports a variety of pixel depths, from 1 to 32
- bits per pixel (bpp). The supported pixel depths (1, 2, 4, 8, or 32 bpp)
- depend on the display resolution and the amount of VRAM in the Quadra.
- The fully expanded capability of both Quadras is the same, i.e., both the
- 900 and 700 can be expanded to 2 MB of VRAM. However, note that 512K of
- VRAM is the minimum configuration for the Quadra 700 whereas it is 1MB of
- VRAM for the Quadra 900 (this is the amount of VRAM soldered on the
- motherboard). The Quadra 700 has 6 VRAM expansion slots, while the 900
- has only 4. Also note that only 0.5 MB, 1 MB, and 2 MB configurations are
- supported (i.e., 1.5 MB is not supported).
-
- The Quadra 700 and 900 can be expanded using 256K (i.e., 128K x 16) 100 nS
- VRAM SIMMs. These are the same as the VRAM SIMM shipped in the base
- configuration of the Macintosh LC, or the VRAM SIMMs used to expand an
- Apple 4*8 video card to an 8*24 card. Note that the 512K VRAM SIMMs used
- to upgrade the Mac LC will _not_ work in a Quadra. (The 256K SIMMs
- removed from an LC when performing a VRAM upgrade will work, however. All
- those old 256K VRAM SIMMs laying around from upgraded LCs can be used to
- upgrade Quadra 700s and 900s!) The DRAM SIMMs used to upgrade an 8*24GC
- video card will also not work.
-
- The following chart lists the Quadra 700 & 900 built-in video's maximum
- pixel depth supported depending upon the VRAM configuration:
-
- Display size 512K VRAM 1MB VRAM 2MB VRAM
- --------- -------- --------
- 12-inch landscape
- 384 x 512
- (such as 12" RGB) 8 bpp 32 bpp 32 bpp
-
- 12-inch Monochrome
- 640 x 480 8 bpp 8 bpp 8 bpp
-
- 13-inch RGB & VGA
- 640 x 480 8 bpp 8 bpp 32 bpp
-
- SVGA
- 800 x 600 8 bpp 8 bpp 32 bpp
-
- 15-inch Portrait (b/w)
- 640 x 870 4 bpp 8 bpp 8 bpp
-
- 16" Color,
- 832 x 624 8 bpp 8 bpp 32 bpp
-
- 2-Page Display (b/w)
- 1152 x 870 4 bpp 8 bpp 8 bpp
-
- 21" Color
- 1152 x 870 4 bpp 8 bpp 8 bpp
-
- PAL without convolution
- underscan-640x480 8 bpp 8 bpp 32 bpp*
- overscan-768x576 8 bpp 8 bpp 32 bpp*
-
- PAL with convolution
- underscan-640x480 n.a. 8 bpp 8 bpp
- overscan-768x576 n.a. 8 bpp 8 bpp
-
- NTSC without convolution
- underscan-512x384 8 bpp 8 bpp 32 bpp
- overscan- 640x480 8 bpp 8 bpp 32 bpp
-
- NTSC with convolution
- underscan-512x384 n.a 8 bpp 8 bpp
- overscan- 640x480 n.s 8 bpp 8 bpp
-
- *Note there are two ways to cable a PAL monitor to a Quadra; only by using
- the proper extended sense code are you able to achieve 32 bits per pixel.
- For details, refer to the previous article on Quadra video sense pinouts.
-
-
- *********************************************************************
- * Dale Adams * Opinions expressed are not necessarily *
- * Apple Computer, Inc. * those of my employer. *
- *********************************************************************
-