【正文】 Motorola TM3000 terminal. On both puter systems, the tester software runs under the VERSAdos operating system and the RMS68K realtime multitasking DTS environment is designed to look and operate the same on both systems. 2． Printer The printers is a small,Centronics patible dot matrix dimensions allow it to reside on an extendable shelf within the DTS is connected to the VME/10 through one of the available parallel ports,or to the SYS1131 via one of the serial ports. 3 Instrumentation Card Rack Most of the tester instrumentation is installed in the upper portion of the DTS cabi . The card rack can hold up to sixteen test instrument cards: DC measurement system board Test head matrix board Voltage source and nanoammeter board Audio voltmeter board Control and measure bits board Time measurement board Handler or prober control board Audio source board Eight voltage and current source boards The card rack also contains an analog and a digital backplane for controlling each digital backplane is connected to the puter via the IBUS cabling. The power V/I source is a special instrument that ,when installed in the system ,is mounted inside the back door as opposed to being in the card rack. The measurement board Card slot one contains the measurement measurement board is a differential DC voltmeter with a maximum input voltage of +65V to measurement board has three measurement ranges,65V,20V,and 2V. The cross point matrix board Card slot two holds the cross point matrix cross matrix board consists of three sections:a timer interval generator,a sixteen input measurement matrix,The time interval generator is used to time a