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Showing results for tags 'VRAM'.
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Hi folks, this is my first post here and I’m looking for some help diagnosing yet another video issue with a Mac SE/30 - hoping that someone could point me in the right direction. Usual story, dug the Mac out of storage to find it didn’t boot, display full of stripes and noise. Removed the caps, cleaned out the electrolyte, dirt and oxide, replaced caps. The board looks great, no visible broken traces and squeaky clean. Connected to power, the Mac chimes, POSTs and boots all the way to the Finder normally, the mouse and floppy work. The issue is only the left quarter of the screen is being drawn, as if divided into four columns, leaving horizontal strips across the rest. In the Finder I can make out the trash and menubar but being continually overwritten in the same quarter screen. It’s as if only 25% the VRAM is being written, but the whole memory is being read back out to the video circuit. With the RAM and ROM SIMMs out the Mac shows a stable full screen stripe pattern. Swapping out both RAM/ROM with a known good set yields the same results. I’d appreciate it if anyone could offer any advice on what could be happening. Before I buzz out the entire board or start replacing chips I’d like an idea of what’s going on.
Ok guys as micron cards are either rarer than hens teeth or more expensive than the Cullinan diamond can you upgrade THE SE/30’s on board 64kb Video RAM, i.e could you replace it with say a 256kb or 512kb chip? I presume this 64kb chip is soldered on the motherboard somewhere, what chip is it? Or is it just a pipedream and really thetr isn’t a way to up the spec without such a micron card? I ask as im using mine for graphics which is perhaps hadly the perfect machine but fun nevertheless neal
So i've tried once to upgrade the video card for my G4 cube, which has 16mb VRAM from the factory. I have found that the few other cards for G4 tower computers that technically *will* fit in the Cubes short AGP slot, but do not fit well, they need things removed, don't fit flush (ie are recessed and monitor cable doesn't plug in well), etc. etc. The G4 cube supposedly had a factory 32MB options from two companies (source Low End Mac): ATI Radeon with 32 MB of VRAM Nvidia GeForce2 MX with 32 MB VRAM Had anyone seen these in the wild ever? Do both of them exist to peoples knowledge? Would love to find one someday, but starting to lose hope on the factory upgrade card.
Simple question. The LC 475 has 2 VRAM SIMM Sockets, so does it need both to be filled for its video to work or can it work with just one? All the other LCs only need one as they have one SIMM but the LC 475 has two.