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This also led to a discrepancy where the U.S. This started very early on with the original Japanese launch units the SCPH-1000, released on 3 December 1994, was the only model that had an S-Video port, which was removed on the next release. From an external viewpoint, the most notable change was the gradual reduction in the number of external connectors from the back of the unit. The PlayStation went through a number of variants during its production run, each accompanied by a change in the part number. The SCPH-900x revision saw the removal of the Parallel I/O port while the RCA jacks were removed in the SCPH-550x revision.
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A comparison of the SCPH-1001 (bottom), SCPH-5501 (middle) and SCPH-9001 (top) models.
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