commit de7b46c7ee932e379dd607992f559c6b06c8e69a
Author: Lars Skovlund <lskovlun@sprogklog.dk>
Date:   Sun Sep 17 03:41:33 2023 +0200

    Put the PMachine prev register in memory

diff --git a/EXT/OPCODES.S b/EXT/OPCODES.S
index e95361f..fc9a2cc 100644
--- a/EXT/OPCODES.S
+++ b/EXT/OPCODES.S
@@ -484,6 +484,7 @@ OP_bnot:
 
 Comp	macro	cond
 	mov	cx, acc
+	mov 	prev, cx
 	cmp	cx, [bp]
 if	($-True1+1) LT 127
 	j&cond	True1
@@ -874,8 +875,8 @@ OP_self_TWO:
 
 
 OP_pprev:
-;Push previous value of _acc on the stack.  This is left in the cx after
-;a comparison.
+;Push previous value of _acc on the stack.  
+	mov	cx, prev
 	ppush	cx
 	NextOpCode
 
diff --git a/EXT/PMACHINE.I b/EXT/PMACHINE.I
index 8b9e7b9..36bbab9 100644
--- a/EXT/PMACHINE.I
+++ b/EXT/PMACHINE.I
@@ -67,6 +67,7 @@ externdef	theGame:ObjPtr
 externdef	ip:memptr
 externdef	pmsp:wordPtr
 externdef	acc:word
+externdef	prev:word
 externdef	pStack:wordPtr
 externdef	pStackEnd:wordPtr
 externdef	theVars:wordPtr
diff --git a/EXT/SAVEVARS.S b/EXT/SAVEVARS.S
index 667b53b..54c950b 100644
--- a/EXT/SAVEVARS.S
+++ b/EXT/SAVEVARS.S
@@ -45,6 +45,7 @@ theMenuBar	word	?
 ip		memptr		?
 pmsp		wordPtr		?
 acc		word		?
+prev		word		?
 pStack		wordPtr		?
 pStackEnd	wordPtr		?
 theVars		label wordPtr