Date: Sun, 28 Sep 2003 07:24:10 +0100 From: vicki <[EMAIL PROTECTED]>
Does the Q650/800 (Wombat) motherboard have the ability to address more than 1 MB of VRAM? I know there aren't sockets available on the motherboard, but does anyone know if the chips have the ability to address more? If so, has anyone hacked more VRAM into the Wombat motherboard?
I can answer this one .
The 512k simms Yes they can be used in the quads.
Thank you. One answered.
The 512k simms are seen as 256k in the 800.
Thank you. Two answered.
No the 800 mother board can not see more than 1mb even using the 512k simms.
On this final question, what I want to know is whether the components on the motherboard are able to address more than 1 MB of VRAM, even though there are only sockets for 1 MB present on the motherboard. So, in other words, if I wired up my own sockets, would there be address lines on the DFAB chip or the MemC chip to which two more banks of VRAM could be connected?
This may be the kind of question which only some Apple engineer locked in a vault somewhere can answer, but hackers manage to figure out some amazing things, so I figured I'd ask.
Consider the C610 ethernet fix and the C650 serial port fix that the clock chipping community came up with. Given that, there might be someone who has hacked the VRAM, if the chips have the potential to address more.
The Q650/800 has 16M of address space allocated to VRAM, the same as the Q700 and Q900. While that's more a function of ROM rather than the video circuitry, it is an indication that the hardware was built to address 2 MB of VRAM and then Apple limited it to 1 MB for some reason--probably to avoid competing with the Q700 and Q900.
Jeff Walther
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