> 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.
It doesn't matter. The Digital-to Analog Converter (DAC) on the logic board is not capable of converting more than 16-bit color (Thousands), at any resolution. > 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. Yes, they did do that to forestall it competing with (at this point) the Q950. Those were the Scully/Spindler years after all... :-P > > Jeff Walther <http://developer.apple.com/documentation/Hardware/Developer_Notes/Macintos h_CPUs-68K_Desktop/Mac_Centris_Quadra_800.pdf> -- Over, Jutso http://pages.ripco.net/~jutso/ -- Quadlist is sponsored by <http://lowendmac.com/> and... Small Dog Electronics http://www.smalldog.com | Enter To Win A | -- Canon PowerShot Digital Cameras start at $299 | Free iBook! | Support Low End Mac <http://lowendmac.com/lists/support.html> Quadlist info: <http://lowendmac.com/lists/quadlist.shtml> --> AOL users, remove "mailto:"; Send list messages to: <mailto:[EMAIL PROTECTED]> To unsubscribe, email: <mailto:[EMAIL PROTECTED]> For digest mode, email: <mailto:[EMAIL PROTECTED]> Subscription questions: <mailto:[EMAIL PROTECTED]> Archive: <http://www.mail-archive.com/quadlist%40mail.maclaunch.com/> Using a Mac? Free email & more at Applelinks! http://www.applelinks.com
