<PAGE>   1
                                                                      Exhibit 24

                           SPECIAL POWER OF ATTORNEY

     The undersigned constitutes and appoints Christopher S. Alexander and
Jonathon E. Killmer and each of them, his true and lawful attorney-in-fact and
agent with full power of substitution and resubstitution, for him and in his
name, place, and stead, in any and all capacities, to sign the Annual Report on
Form 10-K for the fiscal year ended December 31, 2000, for filing with the
Securities and Exchange Commission by Hypercom Corporation, a Delaware
corporation, together with any and all amendments to such Form 10-K, and to file
the same with all exhibits thereto, and all documents in connection therewith,
with the Securities and Exchange Commission, granting to such attorneys-in-fact
and agents, and each of them, full power and authority to do and perform each
and every act and thing requisite and necessary to be done in and about the
premises, as fully and to all intents and purposes as he might or could do in
person, hereby ratifying and confirming all that such attorneys-in-fact and
agents, or each of them, may lawfully do or cause to be done by virtue hereof.

     DATED: March 23, 2001

                                   /s/ Jock Patton
                                   ---------------
                                   Jock Patton


<PAGE>   2
                           SPECIAL POWER OF ATTORNEY

     The undersigned constitutes and appoints Christopher S. Alexander and
Jonathon E. Killmer and each of them, his true and lawful attorney-in-fact and
agent with full power of substitution and resubstitution, for him and in his
name, place, and stead, in any and all capacities, to sign the Annual Report on
Form 10-K for the fiscal year ended December 31, 2000, for filing with the
Securities and Exchange Commission by Hypercom Corporation, a Delaware
corporation, together with any and all amendments to such Form 10-K, and to file
the same with all exhibits thereto, and all documents in connection therewith,
with the Securities and Exchange Commission, granting to such attorneys-in-fact
and agents, and each of them, full power and authority to do and perform each
and every act and thing requisite and necessary to be done in and about the
premises, as fully and to all intents and purposes as he might or could do in
person, hereby ratifying and confirming all that such attorneys-in-fact and
agents, or each of them, may lawfully do or cause to be done by virtue hereof.

     DATED: February 26, 2001


                                        /s/ Peter J. Hart
                                        -----------------
                                        Peter J. Hart




<PAGE>   3
                           SPECIAL POWER OF ATTORNEY


     The undersigned constitutes and appoints Christopher S. Alexander and
Jonathon E. Killmer and each of them, his true and lawful attorney-in-fact and
agent with full power of substitution and resubstitution, for him and in his
name, place, and stead, in any and all capacities, to sign the Annual Report on
Form 10-K for the fiscal year ended December 31, 2000, for filing with the
Securities and Exchange Commission by Hypercom Corporation, a Delaware
corporation, together with any and all amendments to such Form 10-K, and to file
the same with all exhibits thereto, and all documents in connection therewith,
with the Securities and Exchange Commission, granting to such attorneys-in-fact
and agents, and each of them, full power and authority to do and perform each
and every act and thing requisite and necessary to be done in and about the
premises, as fully and to all intents and purposes as he might or could do in
person, hereby ratifying and confirming all that such attorneys-in-fact and
agents, or each of them, may lawfully do or cause to be done by virtue hereof.

     DATED: February 8, 2001


                                        /s/ Christopher S. Alexander
                                        ----------------------------
                                        Christopher S. Alexander


<PAGE>   4
                           SPECIAL POWER OF ATTORNEY

     The undersigned constitutes and appoints Christopher S. Alexander and
Jonathon E. Killmer and each of them, his true and lawful attorney-in-fact and
agent with full power of substitution and resubstitution, for him and in his
name, place, and stead, in any and all capacities, to sign the Annual Report on
Form 10-K for the fiscal year ended December 31, 2000, for filing with the
Securities and Exchange Commission by Hypercom Corporation, a Delaware
corporation, together with any and all amendments to such Form 10-K, and to
file the same with all exhibits thereto, and all documents in connection
therewith, with the Securities and Exchange Commission, granting to such
attorneys-in-fact and agents, and each of them, full power and authority to do
and perform each and every act and thing requisite and necessary to be done in
and about the premises, as fully and to all intents and purposes as he might or
could do in person, hereby ratifying and confirming all that such
attorneys-in-fact and agents, or each of them, may lawfully do or cause to be
done by virtue hereof.

     DATED: February 09, 2001

                                                   /s/ Albert A. Irato
                                                   ----------------------------
                                                   Albert A. Irato
<PAGE>   5
                           SPECIAL POWER OF ATTORNEY

     The undersigned constitutes and appoints Christopher S. Alexander and
Jonathon E. Killmer and each of them, his true and lawful attorney-in-fact and
agent with full power of substitution and resubstitution, for him and in his
name, place, and stead, in any and all capacities, to sign the Annual Report on
Form 10-K for the fiscal year ended December 31, 2000, for filing with the
Securities and Exchange Commission by Hypercom Corporation, a Delaware
corporation, together with any and all amendments to such Form 10-K, and to
file the same with all exhibits thereto, and all documents in connection
therewith, with the Securities and Exchange Commission, granting to such
attorneys-in-fact and agents, and each of them, full power and authority to do
and perform each and every act and thing requisite and necessary to be done in
and about the premises, as fully and to all intents and purposes as he might or
could do in person, hereby ratifying and confirming all that such
attorneys-in-fact and agents, or each of them, may lawfully do or cause to be
done by virtue hereof.

     DATED: February 13, 2001


                                             /s/   George R. Wallner
                                             -----------------------------
                                             George R. Wallner
<PAGE>   6
                           SPECIAL POWER OF ATTORNEY

     The undersigned constitutes and appoints Christopher S. Alexander and
Jonathon E. Killmer and each of them, his true and lawful attorney-in-fact and
agent with full power of substitution and resubstitution, for him and in his
name, place, and stead, in any and all capacities, to sign the Annual Report on
Form 10-K for the fiscal year ended December 31, 2000, for filing with the
Securities and Exchange Commission by Hypercom Corporation, a Delaware
corporation, together with any and all amendments to such Form 10-K, and to
file the same with all exhibits thereto, and all documents in connection
therewith, with the Securities and Exchange Commission, granting to such
attorneys-in-fact and agents, and each of them, full power and authority to do
and perform each and every act and thing requisite and necessary to be done in
and about the premises, as fully and to all intents and purposes as he might or
could do in person, hereby ratifying and confirming all that such
attorneys-in-fact and agents, or each of them, may lawfully do or cause to be
done by virtue hereof.

     DATED: February 12, 2001


                                             /s/   William Keiper
                                             -----------------------------
                                             William Keiper
<PAGE>   7
                           SPECIAL POWER OF ATTORNEY

     The undersigned constitutes and appoints Christopher S. Alexander and
Jonathon E. Killmer and each of them, her true and lawful attorney-in-fact and
agent with full power of substitution and resubstitution, for her and in her
name, place, and stead, in any and all capacities, to sign the Annual Report on
Form 10-K for the fiscal year ended December 31, 2000, for filing with the
Securities and Exchange Commission by Hypercom Corporation, a Delaware
corporation, together with any and all amendments to such Form 10-K, and to file
the same with all exhibits thereto, and all documents in connection therewith,
with the Securities and Exchange Commission, granting to such attorneys-in-fact
and agents, and each of them, full power and authority to do and perform each
and every act and thing requisite and necessary to be done in and about the
premises, as fully and to all intents and purposes as she might or could do in
person, hereby ratifying and confirming all that such attorneys-in-fact and
agents, or each of them, may lawfully do or cause to be done by virtue hereof.

     DATED:    February 28, 2001



                                        /s/ Jane Evans
                                        --------------------------
                                        Jane Evans