H133498 - Full & 3/4 Length Adapters Not Supported in Slot #1 TEXT: Due to the Industry Standard design characteristics of the IBM PC 340 Series 6560 and PC 100 Series 6260 machine types, full and 3/4 length ISA adapters are not supported in slot #1. Installing full or 3/4 length ISA adapters in slot 1 may cause the adapter to make contact with the memory SIMMs. Slot 1 should be reserved for shorter length ISA adapters. Install full and 3/4 length adapters in slots 2 or 3. This information will be documented in the Users Guide and service documentation.