Synchr030/S combines a custom memory controller with 256MB of SDRAM to double the SE/30's memory capacity and throughput. There's no longer a need to deal with broken SIMM slot tabs, dodgy contacts or aging SIMMs. Synchr030/S provides fastest possible 2-cycle reads and writes to the 68030 CPU, making it the performance equivalent of a 256MB L2 cache that never misses.

Faster memory accelerates nearly every computing task. Games like Spectre Challenger and Vette run more smoothly, archives unstuff faster and the Finder is more responsive. Synchr030/S achieves a MacBench 3.0 CPU score of 124% and Apple Personal Diagnostics reports 170% memory speed compared to a stock SE/30. Its low power consumption of 2.15W is comparable to the DRAM SIMMs it replaces.

/STERM and /DSACK signaling options are selectable via jumper for compatibility with CPU accelerators. Compatibility is confirmed with the Interware Booster 50-SE30F (with /DSACK) and Bolle's PowerCache P33 (with /STERM). Both of these accelerators benefit significantly when paired with Synchr030/S.

A System 6/7 extension enables fast 2-cycle access to SDRAM and expansion to 256MB under System 7 with a IIsi-derived ROM, such as the Rominator II. The extension also performs ROM shadowing, which relocates ROM-resident Toolbox routines to SDRAM, where they can execute faster. Without the extension, the card operates as 128MB of DRAM with the stock 4-cycle access time.

To enable 2-cycle reads, installation of the included /ECS Tap PCB is required. This small board fits over the CPU pins on the back of the logic board and routes the CPU's /ECS signal to the PDS card. This signal is not present in the SE/30's PDS connector.

The controller operates at 63MHz, providing a 32-bit data path to memory at a maximum throughput of 31.33MB/s. Unlike the stock DRAM controller, Synchr030/S does not stall for refresh cycles, so consistent access times are guaranteed. All signals through the card are unbuffered, routed directly to the PDS passthrough connector. The two large capacitors on the board are polymer and will not leak.

Connectix Maxima is supported under System 7, which enables large, disk-backed RAM disks. SDRAM-based RAM disks typically yield 4.5MB/s with the stock CPU, faster than any SCSI device.

On the rear of the PCB, three LEDs indicate various conditions. These are visible through the SE/30's frame, and MacEffects clear case:

• "ACCEL" LED (emerald): Indicates fast 2-cycle SDRAM access, after the extension is loaded.
• "/ECS" LED (white): Indicates activity on the stock CPU's /ECS signal. Will be off when CPU accelerator cards are in use even if connected to the logic board.
• "FPU" LED (yellow): Indicates floating point unit access. This indicator is mirrored at the "FPU LED" through holes at the upper right corner of the PCB. An external LED header may be soldered here if desired. No resistor is needed.

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