This article describes two on-site developed, VME transient recorder systems, with 12 bit resolution, eight (four) differential input channels, sampling frequency up to 1.25 (20) MSPS and 512 (250 or 1000) kWords of memory per channel. Autonomous operation is guaranteed by standard static random access memory, under the control of a programmable logic array device for address generation. This device also manages the external trigger signal and provides the control signals for the analog-to-digital converter in articulation with a programmable timing element that determines the acquisition rate. Software drivers have been developed for the OS-9 operating system. Tests to quantify the channel crosstalk, the common mode noise rejection, and the spectral characterization are presented.
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