Pittsburgh, Pa. —VMAC is a 3U VME carrier board that accepts from one to eight plug-in analog I/O modules. An on-board microcontroller senses which slots contain I/O modules at power up. Then it initializes modules and performs setup. All initialized modules are individually interrogated with last valid and buffered data transferred to on-board SRAM. VMAC has 64 KB SRAM for data and 64 KB FLASH for firmware. The system has >1,500 V dc galvanic and optical isolation from process signals and >500 V isolation between channels. Transfer rate is <1 ms. PEP Modular Computers Inc.