Editing Processor Direct Slot (section)

=== LC slot (Motorola 68020/68030) ===
The LC slot, introduced in [[1990]], began as a PDS for the [[Motorola 68020]] / [[68030]] processors in the [[Macintosh LC]] / [[Macintosh LC II|LC II]]. It only supported the asynchronous cycle of the MC68020, and did not connect all address signals, though it did connect all 32 data signals.<ref>DCDMF3, p. 305.</ref> The 96-pin Euro-DIN connector is similar to the SE slot connector, but the two are completely incompatible. Latter models added 18 more pins through a notched in-line extension to support the full MC68030 bus (synchronous cycle, all address lines, clock both from the CPU and backward-compatible 16 MHz), while retaining backwards compatibility with older cards. This configuration proved to be so popular for Apple's [[Performa]] line that later 68040 such as the [[Macintosh LC 475]] and [[PowerPC]]-based versions were essentially emulating the 68030 pin signals for the LC slots that they inherited.<ref name="lowendmac-pds" /><ref name="apple-maclciii">{{Cite tech report |date=2000 |title=Macintosh LC III Developer Note |url=http://developer.apple.com/documentation/Hardware/Developer_Notes/Macintosh_CPUs-68K_Desktop/Mac_LC_III.pdf |archive-url=https://web.archive.org/web/20040721012340/http://developer.apple.com/documentation/Hardware/Developer_Notes/Macintosh_CPUs-68K_Desktop/Mac_LC_III.pdf |archive-date=21 July 2004 |access-date=3 September 2022}}</ref>