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GPIB Adapter Circuit for Displaywriter and Personal Computer

IP.com Disclosure Number: IPCOM000060587D
Original Publication Date: 1986-Apr-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 74K

Publishing Venue

IBM

Related People

Carson, PV: AUTHOR [+3]

Abstract

The Displaywriter/Personal Computer General-Purpose Interface Bus (GPIB) adapter shown in Fig. 1 is designed to be used in either an IBM Displaywriter or an IBM Personal Computer. The GPIB provides talker/listener/controller functions and a battery-backed real-time clock to either an IBM Displaywriter or an IBM Personal Computer. The talker function allows a device to send status and data bytes when addressed to talk. The listener function allows a device to receive data when addressed to listen. The controller function allows a device to send addresses as well as universal and addressed commands to other devices. The card shown in Fig. 1B is organized as follows.

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GPIB Adapter Circuit for Displaywriter and Personal Computer

The Displaywriter/Personal Computer General-Purpose Interface Bus (GPIB) adapter shown in Fig. 1 is designed to be used in either an IBM Displaywriter or an IBM Personal Computer. The GPIB provides talker/listener/controller functions and a battery-backed real-time clock to either an IBM Displaywriter or an IBM Personal Computer. The talker function allows a device to send status and data bytes when addressed to talk. The listener function allows a device to receive data when addressed to listen. The controller function allows a device to send addresses as well as universal and addressed commands to other devices. The card shown in Fig. 1B is organized as follows. The GPIB Logic section 10 includes: (1) the Intel 8291 or 8291A module designed to interface microprocessors to an IEEE Standard 488 Digital Interface, (2) the Intel 8292 module which, together with the 8291, functions as a complete IEEE Standard 488 Controller, (3) and two Intel 8293 modules which function as standard transceivers for the IEEE 488 bus. The Realtime Clock section 11 (Fig. 1A) includes a National Semi conductor module 58167 which is designed as a microprocessor compatible realtime clock. The System Clock section 12 includes Texas Instruments module 03 which functions as a quadruple two-input positive NAND gate. The Interrupt Logic section 13 includes Texas Instruments modules S260 and LS373. Module S260 functions as a dual five-input NOR gate, while module LS373 contains D-type latches. The Data Bus Buffer section 14 includes two Texas Instruments modules LS...