Browse Prior Art Database

Convertible Card for Multiple Bus Architectures

IP.com Disclosure Number: IPCOM000103960D
Original Publication Date: 1993-Feb-01
Included in the Prior Art Database: 2005-Mar-18
Document File: 4 page(s) / 127K

Publishing Venue

IBM

Related People

Hortensius, PD: AUTHOR [+2]

Abstract

Disclosed is a convertible card for multiple bus architectures.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Convertible Card for Multiple Bus Architectures

      Disclosed is a convertible card for multiple bus architectures.

      Many personal computer expansion cards are maufactured for
either ISA bus or the MCA bus architectures.  This method would allow
one card to be usable in either interface, reducing engineering and
inventory costs.  It would also allow better interchangeability or
easier upgrade paths.  This method is also extendable to cover other
bus architectures.

      There are 2 major systems of PC adapter card architecture (plus
a few variations) widely in use.  The two types of cards are
generally incompatible as they use different physical and logical
connectors.  The actual logic for the two types of busses are
generally similar, although the physical differences in size and pin
out make the two system incompatible.  Often there are cards made for
one bus that are not available for the other since market and/or
inventory requirements may make it infeasible or uneconomical
manufacture and maintain two versions of a specific card.  This is
especially true for a card with lower volume.  This describes a PC
card that is adaptable to either the MCA (Microchannel Architecture)
or the AT/ISA/EISA architecture allowing the same card to be used in
either bus architecture.  Users can reconfigure the card mounting so
as to allow the same card to correctly fit either bus system after
purchase.  This can make upgrading or changing from one system to the
other much more economical.  Rotating the card end-to-end instead of
flipping card over allows the component side of the card to remain
correct so that proper intercard spacing and cooling requirements are
met.  Manufacturing is also made simpler since only card need be
built, tested, and maintained.

      As shown in Figure 1, this new PC adapter card is constructed
so that by reversing the two ends of the card, the correct bus
connector can be installed in either bus architecture.  This allows
the card to operate with the logical pin out, bus conventions, and
physical spacing standardized for that bus.  By placing the two
different bus connectors at the specified corners as illustrated
(lower right and upper left looking from the component side of the
card) rotating the card end-to-end will allow the corresponding
physical connector for each bus to be placed into the PC expansion
bus.  The different bus connector physical dimensions preclude
accidental inserti...