Revert "shave another six bytes"

This reverts commit 8f5f932098be4cec3de5fb95cfa7efdaa2794efb.

sectorlisp.S

@@ -3,7 +3,6 @@
 ╞══════════════════════════════════════════════════════════════════════════════╡
 │ Copyright 2020 Justine Alexandra Roberts Tunney                              │
 │ Copyright 2021 Alain Greppin                                                 │
-│ Some size optimisations by Peter Ferrie                                      │
 │                                                                              │
 │ Permission to use, copy, modify, and/or distribute this software for         │
 │ any purpose with or without fee is hereby granted, provided that the         │
@@ -22,19 +21,19 @@
 // LISP meta-circular evaluator in a MBR
 
 .set ONE,		%bp
-.set NIL,		7
-.set ATOM_T,		15
-.set ATOM_QUOTE,	19
-.set ATOM_COND,		31
-.set ATOM_ATOM,		41
-.set ATOM_CAR,		51
-.set ATOM_CDR,		59
-.set ATOM_CONS,		67
-.set ATOM_EQ,		77
+.set NIL,		1
+.set ATOM_T,		9
+.set ATOM_QUOTE,	13
+.set ATOM_COND,		25
+.set ATOM_ATOM,		35
+.set ATOM_CAR,		45
+.set ATOM_CDR,		53
+.set ATOM_CONS,		61
+.set ATOM_EQ,		71
 
 .set g_token,	0x7800
 .set g_str,	0x0
-.set g_mem,	0x8000
+.set g_mem,	0x3600
 .set boot,	0x7c00
 
 ////////////////////////////////////////////////////////////////////////////////
@@ -49,23 +48,27 @@
 _start:	jmp	.init				# some bios scan for short jump
 .type kSymbols,@object;
 kSymbols:
-	.ascii "\0NIL\0T\0QUOTE\0COND\0ATOM\0CAR\0CDR\0CONS\0EQ\0"
+	.ascii "NIL\0T\0QUOTE\0COND\0ATOM\0CAR\0CDR\0CONS\0EQ"
 
 .type .init,@function
-.init:	ljmp	$0x7c00>>4,$_begin		# end of bios data roundup page
-_begin:	mov	$g_mem,%cx
-	mov	%cx,%fs				# fs = &g_mem
-	xor	%ax,%ax
-	mov	%cx,%di
-	cld
-	rep stosb				# clears our bss memory
-	push	%cs				# memory model cs=ds=es = 0x7c0
+.init:	ljmp	$0x600>>4,$_begin		# end of bios data roundup page
+_begin:	push	%cs				# memory model cs=ds=es = 0x600
 	push	%cs
 	push	%cs
 	pop	%ds
 	pop	%es
+	mov	$kSymbols,%si
+	push	%si
+	xor	%di,%di				# mov g_str, %di
+	mov	$37,%cx
+	cld
+	rep movsb
+	pop	%cx
 	pop	%ss
 	mov	%cx,%sp
+	mov	$g_mem,%ax
+	mov	%ax,%fs				# fs = &g_mem
+	rep stosb				# clears our bss memory
 	mov	$NIL,ONE
 main:	mov	$'\n',%dl
 	call	GetToken