Delbert J Richard

US Patent:

56447043, Jul 1, 1997

Filed:

Nov 30, 1994

Appl. No.:

8/348268

Inventors:

Logan L. Pease - Reno NV
Delbert Richard - Sparks NV
Peter D. Dickinson - late of Reno NV

Assignee:

International Game Technology - Reno NV

International Classification:

G06F 1134

US Classification:

39518318

Abstract:

A method and apparatus for verifying the contents of a storage device. A number of steps are involved in performing the verification. First, non-sequential data is written into each unused memory location of the storage device. Then, a non-associative technique is performed on contents of each memory location in the storage device starting at a randomly determined address in the storage device. Next, a final value from the non-associative technique is provided to a confirmation device for comparison with a set of predetermined resulting values. Then, the final value is compared to a resulting value, the resulting value being predetermined by applying the non-associative technique to pre-programmed contents of the storage device. Finally, one of two signals is generated. A first signal is generated indicating that the contents of the storage device are corrupted if the final value does not correspond to the resulting value.