Editing Processor Direct Slot (section)

=== IIsi, SE/30 slot (Motorola 68030) ===
The [[Macintosh SE/30]] included a PDS slot that uses the same 120-pin Euro-Din connector as the IIci, but a different pin configuration.<ref>DCDMF3, p. 318.</ref> The primary clock is the 16 MHz clock for the CPU. Unlike the IIci cache slot, it includes three interrupt request signals. There is also provision in the case for external connectors, so it was commonly used for graphic or network devices.
The [[Macintosh IIsi]] included a motherboard slot very similar to the SE/30,<ref>DCDMF3, p. 360.</ref> although clocked at 20 MHz like the onboard MC68030. This slot was not intended for direct use, Apple instead offered two adapter cards <ref>DCDMF3, p. 359.</ref> with a second connector mounted at a right angle (so the board would be parallel to the motherboard). One card provided a [[NuBus]] slot, while the other was essentially a pass-though configuration enabling a slot very similar to the IIsi, but with only one interrupt signal supported. Both cards also included an MC68882 FPU, which was not present on the IIsi motherboard.