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Hmm, actually N8VEM SBCs (Z80 V1, Z80 V2, SBC-188) use following pins on serial port header: 2 - DSR 3 - RX 4 - RTS (SBC V2 only, NC on others) 5 - TX 6 - CTS (SBC V2 only, NC on others) 7 - DTR 9 - GND Which matches DTK/Intel pinout. And I am using a flat cable I made using IDC connectors without any problems. Thanks, Sergey On Nov 8, 5:07 pm, "G. Beat" <gregor...@gmail.com> wrote: > Andrew – > > After reading the N8VEM Single Board Computer (SBC) instruction manual > and other documentation, > I noticed the wiring method selected for the IDC10 2.54 mm pitch pin > header on the SBC > that is used for wiring a DE9 RS-232 COM connector (port). > > Did you know that there are TWO industry conventions for this 2x5 > header (RS-232) serial port wiring??http://ss4200.pbworks.com/w/page/5122741/Console%20Access%20via%20RS232 > > The N8VEM SBC adopted the AT/Everex convention for that serial header.http://www.logicsupply.com/products/db9_idc10 > > The DTK/Intel convention is the other approach. > This convention is used by Intel for its motherbaord headers and was > used by Steve Ciarcia and Micromint > for their computer boards in late 1980s/early 1990s. > I prefer this approach -- because NO soldering is required.http://www.logicsupply.com/products/db9_idc10dtk > > You create the cable with two 3M IDC connectors (2x5 female header; > male DE-9) > Then you properly orient you ribbon cable (10 wire wide) using the red > tracer for Pin 1 . > > Intel motherboard usage (D845, SS2400)http://www.intel.com/support/motherboards/desktop/d845pt/sb/cs-013224... > > The current N8VEM ECB document should note this difference (or mark > convention) > for next revisions / board runs. The Intel ss4200 wiki graphics could > be used for clarity. > > Greg Beat > Chicago