Achieved a 4x4 keyboard functionality will help beginners learn 4x4 keyboard, using a text editor, using quartus ii

key_4x4scan_zc
..............\#EY_4X~2.RPT
..............\DB
..............\..\#EY_4X~1.SCI
..............\..\#EY_4X~4.HDB
..............\..\add_sub_2rh.tdf
..............\..\add_sub_ksh.tdf
..............\..\key_4x4scan.asm.qmsg
..............\..\key_4x4scan.c
..............\..\key_4x4scan.cbx.xml
..............\..\key_4x4scan.cmp.bpm
..............\..\key_4x4scan.cmp.cdb
..............\..\key_4x4scan.cmp.ecobp
..............\..\key_4x4scan.cmp.hdb
..............\..\key_4x4scan.cmp.logdb
..............\..\key_4x4scan.cmp.rdb
..............\..\key_4x4scan.cmp.tdb
..............\..\key_4x4scan.cmp0.ddb
..............\..\key_4x4scan.cmp_bb.cdb
..............\..\key_4x4scan.cmp_bb.hdb
..............\..\key_4x4scan.cmp_bb.logdb
..............\..\key_4x4scan.cmp_bb.rcf
..............\..\key_4x4scan.dbp
..............\..\key_4x4scan.db_info
..............\..\key_4x4scan.eco.cdb
..............\..\key_4x4scan.eds_overflow
..............\..\key_4x4scan.fit.qmsg
..............\..\key_4x4scan.fnsim.hdb
..............\..\key_4x4scan.fnsim.qmsg
..............\..\key_4x4scan.hier_info
..............\..\key_4x4scan.hif
..............\..\key_4x4scan.m
..............\..\key_4x4scan.map.bpm
..............\..\key_4x4scan.map.cdb
..............\..\key_4x4scan.map.ecobp
..............\..\key_4x4scan.map.hdb
..............\..\key_4x4scan.map.logdb
..............\..\key_4x4scan.map.qmsg
..............\..\key_4x4scan.map_bb.cdb
..............\..\key_4x4scan.map_bb.hdb
..............\..\key_4x4scan.map_bb.logdb
..............\..\key_4x4scan.pre_map.cdb
..............\..\key_4x4scan.pre_map.cdb.wrk
..............\..\key_4x4scan.pre_map.hdb
..............\..\key_4x4scan.pre_map.hdb.wrk
..............\..\key_4x4scan.psp
..............\..\key_4x4scan.pss
..............\..\key_4x4scan.rtlv.hdb
..............\..\key_4x4scan.rtlv_sg.cdb
..............\..\key_4x4scan.rtlv_sg.cdb.wrk
..............\..\key_4x4scan.rtlv_sg_swap.cdb
..............\..\key_4x4scan.sgdiff.cdb
..............\..\key_4x4scan.sgdiff.hdb
..............\..\key_4x4scan.signalprobe.cdb
..............\..\key_4x4scan.sim.hdb
..............\..\key_4x4scan.sim.qmsg
..............\..\key_4x4scan.sim.rdb
..............\..\key_4x4scan.simfam
..............\..\key_4x4scan.sim_ori.vwf
..............\..\key_4x4scan.sld_design_entry.sci
..............\..\key_4x4scan.sld_design_entry_dsc.sci
..............\..\key_4x4scan.sld_design_entry_dsc.sci.wrk
..............\..\key_4x4scan.syn_hier_info
..............\..\key_4x4scan.tan.qmsg
..............\..\key_4x4scan.tis_db_list.ddb
..............\..\MUX_1HC.TDF
..............\..\MUX_CFC.TDF
..............\..\MUX_RIC.TDF
..............\..\prev_cmp_key_4x4scan.asm.qmsg
..............\..\prev_cmp_key_4x4scan.fit.qmsg
..............\..\prev_cmp_key_4x4scan.map.qmsg
..............\..\prev_cmp_key_4x4scan.qmsg
..............\..\prev_cmp_key_4x4scan.sim.qmsg
..............\..\prev_cmp_key_4x4scan.tan.qmsg
..............\..\Quartus_.Ver
..............\..\WED.WSF
..............\FP.VHD
..............\key_4x4scan.asm.rpt
..............\key_4x4scan.done
..............\key_4x4scan.dpf
..............\key_4x4scan.fit.rpt
..............\key_4x4scan.fit.smsg
..............\key_4x4scan.fit.summary
..............\key_4x4scan.flow.rpt
..............\key_4x4scan.map.rpt
..............\key_4x4scan.map.summary
..............\key_4x4scan.pin
..............\key_4x4scan.pof
..............\key_4x4scan.qpf
..............\key_4x4scan.qsf
..............\key_4x4scan.qws
..............\key_4x4scan.sof
..............\key_4x4scan.tan.rpt
..............\key_4x4scan.tan.summary
..............\key_4x4scan.vhd
..............\key_4x4scan.vwf
..............\key_4x4scan_description.txt
..............\Main.vhd

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