Provide emulated dial-up lines.

For LMODEM to work, it requires a TTY line to have the %TYDIL dial-up
bit set in TTYTYP.  Only TK-10, Morton, and DTE-20 controllers are
recognized.

build/mchn/KA/run

@@ -30,6 +30,7 @@ at mty 10003 speed=50000
 at mty line=9,10018 speed=9600
 at mty line=8,10017 speed=9600
 at mty line=7,10016;notelnet speed=50000
+at mty line=6,10015 speed=9600
 set ten11 enabled
 at ten11 10011
 set auxcpu enabled

build/pdp10-kl/run

@@ -13,6 +13,8 @@ at tty 10007
 at tty line=14,10018 speed=9600
 # Tektronix
 at tty line=13,10017 speed=9600
+# Dial-up
+at tty line=12,10015 speed=9600
 set pd ena
 set pd on
 set mta type=b

build/simh/boot

@@ -7,7 +7,9 @@ at dz0 10004
 # VT52
 at dz0 line=7,10018
 # GT40
-at tty line=6,10019
+at dz0 line=6,10019
+# Dial-up
+at dz0 line=5,10015
 set rp0 rp06
 at rp0 out/simh/rp0.dsk
 b rp0