1PCB Fabrication Package. Google Mega2560 Arduino Rev. C 2011-03-23 2 3Gerber Files in RS-274-X Format 4 m256_tslk.gbr - Top Silkscreen 5 m256_tpst.gbr - Top Solderpaste (Stencil) 6 m256_tmsk.gbr - Top Soldermask 7 m256_tcmp.gbr - Top Copper 8 m256_bcmp.gbr - Bottom Copper 9 m256_bmsk.gbr - Bottom Soldermask 10 m256_bslk.gbr - Bottom Silkscreen 11 12Drill files: 13 m256_drl.drl - Excellon Drill file 14 15Fab drawing: 16 17 m256_fab.pdf 18 19Coordinates: 20 21 m256.mnt - Top SMD coordinates 22 23Board dimensions/outline included as zero width trace in silkscreen layer 24for reference. Board is made from 0.062" FR4 with 1oz copper on all 25layers. Minimum trace/space is 6/6 mils. 26 27NOTE: Board contains 3 plated slots, each slot is marked at the two ends 28and center with 0.041" drills. 29 30Board layers stacked as follows: 31 32 Top Silkscreen (Black) 33 Top Soldermask (White) 34 Top Copper (1oz) 35 FR4 (62 mil) 36 Bottom Copper (1oz) 37 Bottom Soldermask (White) 38 Bottom Silkscreen (Black) 39 40Process the silkscreen layer against the soldermask layer to prevent 41overlapping silkscreen on the pads through mask openings. 42 43