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Processor Direct Slot
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=== Quadra PDS (Motorola 68040) === The [[Macintosh Quadra]] series was introduced in [[1991]] with a new PDS for the [[Motorola 68040]] processor which was in-line with one of the [[NuBus]] slots. The [[Macintosh Quadra 605|Quadra 605]] and [[Macintosh Quadra 630|Quadra 630]] were exceptions which used the full 114-pins version of the LC slot. Both allowed for [[PowerPC]] upgrades, including through the "Ready for PowerPC upgrade" program, using Apple's [[Macintosh Processor Upgrade Card]].<ref name="lowendmac-pds" />
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