possible via an LC PDS card. The 68LC040 can be replaced with a 68040 which includes onboard Floating Point Unit. This will approximately triple the speed of floating point operations. Random access memory: 4 MB on the motherboard, one 72-pin SIMM socket for 80 ns or faster SIMMs. The official supported maximum RAM is 36 MB in one 32 MB 72-pin SIMM plus 4 MB on the motherboard, but larger SIMMs do work—up to 128 MB may be used, with some limits on RAM type. Physical limits might apply if the side of the SIMM facing the CPU has thicker chips, as the clips on the SIMM socket will not close around it automatically. It should be possible to manually push the clips enough to hold the SIMM in place. The DJMEMC memory controller used in the Quadra 605's predecessors (Quadra/Centris 610, Quadra/Centris 650 and Quadra 800) will only recognize SIMMs up to 32 MB, while the newer MEMCjr used in the Quadra 605 recognizes the larger sizes. Video: Video out is provided by one DA15F connector, and is compatible with VGA monitors through the use of an adaptor. Two internal Video RAM slots can take either two 256 KB 80 ns 68-pin VRAM SIMMs, or two 512 KB SIMMs. Installing one 512 KB and one 256 KB VRAM SIMM garbles the display. Resolutions and colors available with the two VRAM configurations are shown in the table below: Audio: Out: stereo 8-bit, 11 kHz or 22 kHz; this is the first Macintosh LC model to support stereo output In: Line-level. The input socket is a stereo socket, and can input two channels of a stereo signal—however, these are mixed and only accessible to the hardware as a combined mono 8-bit signal. An Apple PlainTalk Microphone provides line-level input by using a longer 4-contact plug which receives power from a 5 V supply within the input jack. Other microphones only give a mic-level input, and do not work with the Quadra 605. Recording is possible at 11,025 or 22,050 samples/second, with filters applied at 3.5 kHz and 7 kHz, respectively, while recording. Floppy Drive: 1.4 MB SuperDrive, manual-inject. Hard Drive: 80 MB, 160 MB or 230 MB SCSI hard drive, depending on model. Battery: Quadra 605s take a lithium half-AA cell 3.6 V battery. If the battery is drained, the video will not start up. To start up a Quadra 605