updated README about serial card configuration

README.md

@@ -32,6 +32,8 @@ Note:
 ```
 So it appears that the drivers for real comm ports handle BREAK correctly, as does the driver for the USB ftdi adapter, on both WinXP and Linux. The USB prolific adapter hardware and/or driver do not handle a BREAK, altho all data transfers operate correctly.
 
+Configuring your serial card in the PDP-11 requires it be setup as 8-N-1 (8b data, no parity, one stop) AND that the serial interface card (example, a DL11-W in a UNIBUS system) be setup at the standard address of 776500 thru 776506. Also make sure that the card is enabled to send BREAK as that is an integral part of the TU58 serial protocol.
+
 A cygwin folder with a precompiled 32b cygwin executable (tu58em.exe) is included for those without cygwin environment access. Under Windows, just open a standard CMD.EXE window, change to the cygwin folder, and run the <B>tu58em.exe</B> executable as a command line program.
 
 If the emulator is run with no options, it prints a usage screen:

main.c

@@ -83,6 +83,7 @@
 //                                 so that BREAKs are handled correctly via setjmp/longjmp
 //                                 Update tu58drive.c to intercept rx byte read routine to
 //                                 detect input line BREAK and process as required.
+// v2.0b - 03 Apr 2018 - donorth - Change iflags from PARMRK|IGNPAR to PARMRK|INPCK
 //
 
 
@@ -93,7 +94,7 @@
 static char copyright[] = "(C) 2005-2017 Don North <ak6dn" "@" "mindspring.com>, " \
                           "(C) 1984 Dan Ts'o <Rockefeller University>";
 
-static char version[] = "tu58 tape emulator v2.0a";
+static char version[] = "tu58 tape emulator v2.0b";
 
 static char port[32] = "1"; // default port number (COM1, /dev/ttyS0)
 static long speed = 9600; // default line speed

makefile

@@ -9,25 +9,26 @@ ifeq ($(OPSYS),Darwin)
 # mac: UNIX comms model, but on MACOSX
 OPTIONS = -DMACOSX
 LFLAGS = -lpthread
+BINDIR = /usr/local/bin
 else ifeq ($(OPSYS:CYGWIN%=CYGWIN),CYGWIN)
 # win: WINDOWS comms model under CYGWIN (any version)
 OPTIONS = -DCYGWIN -DWINCOMM
 LFLAGS = -lpthread -lrt
+BINDIR = /cygdrive/e/DEC/tools/exe
 else ifeq ($(OPSYS),Linux)
 # unix: UNIX comms model under LINUX, use PARMRK serial mode
 OPTIONS = -DLINUX -DUSE_PARMRK
 LFLAGS = -lpthread -lrt
+BINDIR = /usr/local/bin
 else # unknown environment
 OPTIONS =
 LFLAGS = -lpthread -lrt
+BINDIR = /usr/local/bin
 endif
 
 # default program name, redefine PROG=xxx on command line if wanted
 PROG = tu58em
 
-# put your binary installation directory here...
-BINDIR = /cygdrive/e/DEC/tools/exe
-
 # compiler flags and libraries
 CC = gcc
 CFLAGS = -I. -O3 -Wall -c $(OPTIONS)

serial.c

@@ -586,10 +586,10 @@ void devinit (char *port,
     // open serial port
     int32_t euid = geteuid();
     int32_t uid = getuid();
-    setreuid(euid, -1);
+    if (setreuid(euid, -1)) fatal("setreuid(euid,-1) failed");
     if (sscanf(port, "%u", &n) == 1) sprintf(name, "/dev/ttyS%u", n-1); else strcpy(name, port);
     if ((device = open(name, O_RDWR|O_NDELAY|O_NOCTTY)) < 0) fatal("no serial line [%s]", name);
-    setreuid(uid, euid);
+    if (setreuid(uid, euid)) fatal("setreuid(uid,euid) failed");
 
     // get current line params, error if not a serial port
     if (tcgetattr(device, &lineSave)) fatal("not a serial device [%s]", name);
@@ -602,7 +602,7 @@ void devinit (char *port,
 		       INLCR  | IGNCR  | ICRNL   | IXON  | IXOFF  |
 		       IUCLC  | IXANY  | PARMRK  | IGNPAR );
 #ifdef USE_PARMRK
-    line.c_iflag |=  ( PARMRK | IGNPAR );
+    line.c_iflag |=  ( PARMRK | INPCK );
 #else // !USE_PARMRK
     line.c_iflag |=  ( 0 );
 #endif // !USE_PARMRK