Browse Prior Art Database

Set-Up Capability for Industry Standard Architecture Computers

IP.com Disclosure Number: IPCOM000121140D
Original Publication Date: 1991-Jul-01
Included in the Prior Art Database: 2005-Apr-03
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Casavant, PC: AUTHOR

Abstract

By adding an adapter select register and OR circuits to industry standard architecture (ISA) computers and replacing manual switches with circuitry added to present programmable adapters, an address enable (-AEN) signal is made available only to selected card slots through software control. Thus, set-up is accomplished without setting switches manually.

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Set-Up Capability for Industry Standard Architecture Computers

      By adding an adapter select register and OR circuits to
industry standard architecture (ISA) computers and replacing manual
switches with circuitry added to present programmable adapters, an
address enable (-AEN) signal is made available only to selected card
slots through software control.  Thus, set-up is accomplished without
setting switches manually.

      Enhancements added to ISA computers are shown in Fig. 1.  Input
to adapter select register 10 is from ISA bus 12. Individual slot
adapters for slots S0, S1, S2, S3 ...,  are enabled by either an
output from register 10 or a direct memory access active input 14
through individual OR circuits.

      Manual switches are replaced on programmable slot adapters
shown in Fig. 2.  Configuration data 16 is obtained from adapter
set-up register 18 having had input ISA data 20 and a clock input clk
from set-up decoder 22.  ISA address data 24 is binary input to
decoder 22.  Inputs -AEN and -IOW (I/O write bus signal) activate
enable 1 and enable 2 (en1 and en2) of decoder 22.