NeXT 40MHz Nitro accelerator, the NeXT RISC workstation has increased memory capacity, and faster processor. It is possible to upgrade the color turbo using the very rare Nitro accelerator, which is a 40 mHz 68040 with 128k of cache. It is rumored that approximately twenty of these exist, though the number may be even lower than that these days. I don't have one of those, but I wish i did.
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abigayle
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