🚀 go-pugleaf

Subject: 'as' doesn't recognize the no-op instruction
Index:	bin/as 2.10BSD

Description:
	the assembler 'as' doesn't recognize (yet another) instruction,
	the "nop" (no-operation).  This created a problem when recompiling
	the standalone system because some of the boot programs require
	a 'nop' as the first word.
	
Repeat-By:
	cd /tmp
	ed x.s
	a
	nop
	w
	q
	/bin/as x.s

	observe the error.

Fix:
	Somewhere along the way, the 'nop' handling either didn't make
	it in to the distribution OR the 'nop' pseudo-define was removed
	from pdp/DEFS.h.  IN ANY EVENT, an assembler should support ALL
	the instructions of the processor it runs on (should also be
	able to run split I/D and/or shared text, but i haven't gotten
	carried away enough yet), this is a small attempt to move in
	that direction.

	Apply the following patches to bin/as/{as19.s,as29.s} to implment
	'nop'.

*** as19.s.old	Fri Jan 22 07:06:51 1988
--- as19.s	Tue Aug 22 17:12:08 1989
***************
*** 184,189 ****
--- 184,190 ----
  
  / flag-setting
  
+ <nop\0\0\0\0\0>;	01;0000240
  <clc\0\0\0\0\0>;	01;0000241
  <clv\0\0\0\0\0>;	01;0000242
  <clz\0\0\0\0\0>;	01;0000244
*** as29.s.old	Fri Jan 22 07:28:05 1988
--- as29.s	Tue Aug 22 17:12:29 1989
***************
*** 151,156 ****
--- 151,157 ----
  
  / flag-setting
  
+ 01;0000240 /nop
  01;0000241 /clc
  01;0000242 /clv
  01;0000244 /clz