Description: IEEE-488 Interface Card: Product Description (11/96)
Header: IEEE-488 Interface Card: Product Description (11/96)

 Article Created: 05 August 1996
 Article Reviewed/Updated: 14 November 1996

 TOPIC -----------------------------------------------------------

 This article describes the Apple IEEE-488 Interface Card. This card has been
 discontinued and is no longer available from Apple.

 DISCUSSION ------------------------------------------------------

 Technical Specifications
 ========================

 As a Listener/Talker/Controller, the Apple IEEE-488 Interface card provides a
 fully compatible subset of the IEEE-488 standard. (Its only limitation is
 that it cannot pass control to another IEEE-488 controller.)

 The interface card can also function as a device on the IEEE-4888 bus. With a
 user-defined program, the card can be used to attach non-IEEE-488-compatible
 instruments to the bus.


 General Purpose Instrument Bus Commands
 ---------------------------------------
 WRITE      Write Data Out
 WRITECNT   Write Data Out with Count
 READ       Read Data In
 READCNT    Read Data In with Count
 XFER       Transfer Data
 TRIGR      Group Execute Trigger
 CLRAL      Clear All Devices
 CLEAR      Clear Selected Devices
 REMAL      Remote Enable All
 LLKAL      Local Lockout All Devices
 LOCAL      Local Mode All Devices
 LOCDV      Local Mode Selected Devices
 SRQD       Service Requested
 SPOOL      Serial Poll
 PPOLL      Parallel Poll
 PPENB      Parallel Poll Enable
 PPDIS      Parallel Poll Disable
 PPDIS      Parallel Poll Disable
 PPUAL      Parallel Poll Unconfigure All Devices
 DEVICE     Controller Device Number
 LINEFEED   Line Feed Control
 EOS        End of String Character
 SCREEN     Screen Control
 ABORT      Clear All Interfaces
 UNTALK     Universal Untalk


 Device Capabilitie
 ------------------
 SH1, AH1, T3, L1, DC1, DT1, C1, C2, C3, C4, C25.


 Operating Life
 --------------
 To increase operating life, devices on the bus not in use should be turned
 off. However, proper operation of the bus requires some of the devices be
 turned on. The rule of thumb is the computer plus at least half of the
 devices connected to it must be powered on.


 Software
 --------
 The following software is supported by on-board, ROM-based firmware and
 signal protocol on the bus is handled by the resident software. 1. BASIC
 2. Assembly macro commands
 3. Pascal and FORTRAN through assembly language routines


 Maximum Devices
 ---------------
 Per card: 14


 Maximum cards
 -------------
 Per computer: 7


 Package
 =======

 Apple IEEE-488 Interface Card terminates in standard IEEE-488 socket.

 Back-panel bracket connects to Apple case ground (for low RFI systems)

 Instruction manual includes GPIB connections, listener addresses, talker
 addresses, secondary addresses, and control codes.


 System Configuration
 ====================

 Apple II or Apple II Plus with a minimum of 32K RAM and available expansion
 slot.

 Apple IIe system with an available expansion slot.


 Article Change History:
 14 Nov 1996 - Reviewed for technical accuracy, revised formatting.
 Copyright 1985-96, Apple Computer, Inc.
 Keywords:  SPECSHT