Checking Pins and Pin Connections

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Checking Schematic: SCHEMATIC1
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Checking Electrical Rules 
WARNING:  [DRC0005]  Unconnected pin U5,2B2
                    SCHEMATIC1, PAGEE:Buffer  (8.00, 2.70) 
WARNING:  [DRC0005]  Unconnected pin U5,2B3
                    SCHEMATIC1, PAGEE:Buffer  (8.00, 2.80) 
WARNING:  [DRC0005]  Unconnected pin U5,2B4
                    SCHEMATIC1, PAGEE:Buffer  (8.00, 2.90) 
WARNING:  [DRC0005]  Unconnected pin U5,2B5
                    SCHEMATIC1, PAGEE:Buffer  (8.00, 3.00) 
WARNING:  [DRC0005]  Unconnected pin U5,2B6
                    SCHEMATIC1, PAGEE:Buffer  (8.00, 3.10) 
WARNING:  [DRC0005]  Unconnected pin U5,2B7
                    SCHEMATIC1, PAGEE:Buffer  (8.00, 3.20) 
WARNING:  [DRC0005]  Unconnected pin U5,2B8
                    SCHEMATIC1, PAGEE:Buffer  (8.00, 3.30) 
WARNING:  [DRC0005]  Unconnected pin U5,2A8
                    SCHEMATIC1, PAGEE:Buffer  (6.50, 3.30) 
WARNING:  [DRC0005]  Unconnected pin U5,2A7
                    SCHEMATIC1, PAGEE:Buffer  (6.50, 3.20) 
WARNING:  [DRC0005]  Unconnected pin U5,2A6
                    SCHEMATIC1, PAGEE:Buffer  (6.50, 3.10) 
WARNING:  [DRC0005]  Unconnected pin U5,2A5
                    SCHEMATIC1, PAGEE:Buffer  (6.50, 3.00) 
WARNING:  [DRC0005]  Unconnected pin U5,2A4
                    SCHEMATIC1, PAGEE:Buffer  (6.50, 2.90) 
WARNING:  [DRC0005]  Unconnected pin U5,2A3
                    SCHEMATIC1, PAGEE:Buffer  (6.50, 2.80) 
WARNING:  [DRC0005]  Unconnected pin U5,2A2
                    SCHEMATIC1, PAGEE:Buffer  (6.50, 2.70) 

Checking for Unconnected Nets
WARNING:  [DRC0007]  Net has no driving source A[24:0]
                    SCHEMATIC1, PAGEM:EXT_BUS  (3.00, 4.30) 
WARNING:  [DRC0007]  Net has no driving source A[24:0]
                    SCHEMATIC1, PAGEM:EXT_BUS  (3.00, 4.30) 
WARNING:  [DRC0007]  Net has no driving source A[24:0]
                    SCHEMATIC1, PAGEM:EXT_BUS  (3.00, 4.30) 
WARNING:  [DRC0007]  Net has no driving source A[24:0]
                    SCHEMATIC1, PAGEM:EXT_BUS  (3.00, 4.30) 
WARNING:  [DRC0007]  Net has no driving source LADDR[24:0]
                    SCHEMATIC1, PAGEE:Buffer  (1.50, 1.90) 
WARNING:  [DRC0007]  Net has no driving source LADDR[24:0]
                    SCHEMATIC1, PAGEE:Buffer  (1.50, 1.90) 
WARNING:  [DRC0007]  Net has no driving source LADDR[24:0]
                    SCHEMATIC1, PAGEE:Buffer  (1.50, 1.90) 
WARNING:  [DRC0007]  Net has no driving source LADDR[24:0]
                    SCHEMATIC1, PAGEE:Buffer  (1.50, 1.90) 
WARNING:  [DRC0006]  Net has fewer than two connections IDE_INT
                    SCHEMATIC1, PAGEL:IDE  (5.00, 3.20) 
WARNING:  [DRC0006]  Net has fewer than two connections A23
                    SCHEMATIC1, PAGEM:EXT_BUS  (2.20, 4.30) 
WARNING:  [DRC0006]  Net has fewer than two connections A22
                    SCHEMATIC1, PAGEM:EXT_BUS  (2.20, 4.30) 
WARNING:  [DRC0006]  Net has fewer than two connections A21
                    SCHEMATIC1, PAGEM:EXT_BUS  (2.20, 4.30) 
WARNING:  [DRC0006]  Net has fewer than two connections A20
                    SCHEMATIC1, PAGEM:EXT_BUS  (2.20, 4.30) 
WARNING:  [DRC0006]  Net has fewer than two connections nXBREQ
                    SCHEMATIC1, PAGEA:DO_SIMM144  (6.60, 3.30) 
WARNING:  [DRC0006]  Net has fewer than two connections LADDR23
                    SCHEMATIC1, PAGEE:Buffer  (1.20, 0.80) 
WARNING:  [DRC0006]  Net has fewer than two connections LADDR22
                    SCHEMATIC1, PAGEE:Buffer  (1.20, 0.80) 
WARNING:  [DRC0006]  Net has fewer than two connections LADDR21
                    SCHEMATIC1, PAGEE:Buffer  (1.20, 0.80) 
WARNING:  [DRC0006]  Net has fewer than two connections LADDR20
                    SCHEMATIC1, PAGEE:Buffer  (1.20, 0.80)