Make $^N work in exec DDT when not using KS10 one-proceed.

build/ka10/include.tcl

@@ -54,6 +54,7 @@ proc make_ntsddt {} {
     respond "cpusw=" "0\r"
     respond "ndsk=" "0\r"
     respond "dsksw=" "0\r"
+    respond "1PRSW=" "1\r"
     expect ":KILL"
 }
 

build/misc.tcl

@@ -1184,6 +1184,7 @@ respond "*" ":midas dsk0:.;@ ntsddt_system;ddt\r"
 respond "cpusw=" "2\r"
 respond "ndsk=" "1\r"
 respond "dsksw=" "3\r"
+respond "1PRSW=" "1\r"
 expect ":KILL"
 
 # IOELEV, PDP-11 doing I/O for the PDP-10 host.

doc/debugging.md

@@ -31,4 +31,4 @@ Notes where exec DDT differs from timesharing DDT.
 | " | Print ◊Q as five ASCII characters
 | # | Print ◊Q as one ASCII character | N/A
 | <kbd>^N</kbd> | Single step | KS10 only
-| ◊<kbd>^N</kbd> | Stop at next instruction (skip over calls) | N/A
+| ◊<kbd>^N</kbd> | Stop at next instruction (skip over calls) | Not on KS10

src/system/ddt.69

@@ -79,7 +79,6 @@ TKS, SETF New One Proceed? (Using 1-proceed microcode),KS1PR
 IFNDEF KS1PR, KS1PR==:0
 
 IFN KS1PR, 1PRSW==:0		; Only one kind of one proceed please
-1PRSW==:0			; DOESN'T WORK!
 setf Old One Proceed?,1PRSW
 
 subttl assignments and definitions
@@ -1995,10 +1994,6 @@ REMOV1:	MOVE T,B1INS-B1ADR(S)	;INSTRUCTION AT BREAKPOINT <N>
 REMOV3:	SUBI S,3
 	CAIL S,B0ADR
 	JRST REMOV1
-IFN 1PRSW,[
-	SETZM TB1ADR	;FLUSH TEMPORARY BREAKS
-	SETZM TB2ADR
-];1PRSW
 IFN KS1PR,[
 	MOVE T,1PNSV
 	SKIPE R,1POADR		; If UPT1PN usurped,