diff --git a/blk/650 b/blk/650
index d8ef94c..0bde4f0 100644
--- a/blk/650
+++ b/blk/650
@@ -1,16 +1,5 @@
 AVR assembler
 
-This assembler works very much like Z80 assembler (B200) so 
-refer to this documentation first. Here, we document specifici-
-ties.
-
-All mnemonics in AVR have a single signature. Therefore, we     
-don't need any "argtype" suffixes. 
-
-Registers are referred to with consts R0-R31. There is
-X, Y, Z, X+, Y+, Z+, X-, Y-, Z- for appropriate ops (LD, ST).
-XL, XH, YL, YH, ZL, ZH are simple aliases to R26-R31.
-
-Branching works differently. Instead of expecting a byte to be  
-written after the naked op, branching words expect a displace-  
-ment argument.                                           (cont.)
+651 Guide                      655 Instructions list
+660 Loader                     661-672 Code
+672 Common AVR consts
diff --git a/blk/651 b/blk/651
index 76f5678..b29b7fa 100644
--- a/blk/651
+++ b/blk/651
@@ -1,9 +1,16 @@
-This is because there's bitwise ORing involved in the creation  
-of the final opcode, which makes z80a's approach impractical.
+This assembler works very much like Z80 assembler (B200) so
+refer to this documentation first. Here, we document specifici-
+ties.
 
-This makes labelling a bit different too. Instead of expecting  
-label words after the naked branching op, we rather have label
-words expecting branching wordref as an argument. Examples:
+All mnemonics in AVR have a single signature. Therefore, we
+don't need any "argtype" suffixes.
 
-L2 ' BRTS FLBL! ( branch forward to L2 )
-L1 ' RJMP LBL, ( branch backward to L1 )
+Registers are referred to with consts R0-R31. There is
+X, Y, Z, X+, Y+, Z+, X-, Y-, Z- for appropriate ops (LD, ST).
+XL, XH, YL, YH, ZL, ZH are simple aliases to R26-R31.
+
+Branching works differently. Instead of expecting a byte to be
+written after the naked op, branching words expect a displace-
+ment argument.
+
+                                                        (cont.)
diff --git a/blk/652 b/blk/652
new file mode 100644
index 0000000..76f5678
--- /dev/null
+++ b/blk/652
@@ -0,0 +1,9 @@
+This is because there's bitwise ORing involved in the creation  
+of the final opcode, which makes z80a's approach impractical.
+
+This makes labelling a bit different too. Instead of expecting  
+label words after the naked branching op, we rather have label
+words expecting branching wordref as an argument. Examples:
+
+L2 ' BRTS FLBL! ( branch forward to L2 )
+L1 ' RJMP LBL, ( branch backward to L1 )
diff --git a/blk/655 b/blk/655
new file mode 100644
index 0000000..bf77661
--- /dev/null
+++ b/blk/655
@@ -0,0 +1,16 @@
+AVR instructions list
+
+OPRd (B663)
+ASR  COM   DEC   INC   LAC   LAS   LAT   LSR   NEG   POP   PUSH
+ROR  SWAP  XCH
+
+OPRdRr (B664)
+ADC  ADD   AND   CP    CPC   CPSE  EOR   MOV   MUL   OR   SBC
+SUB
+
+OPRdA (B664)
+IN   OUT
+
+OPRdK (B665)
+ANDI CPI   LDI   ORI   SBCI   SBR   SUBI
+                                                        (cont.)
diff --git a/blk/656 b/blk/656
new file mode 100644
index 0000000..db63709
--- /dev/null
+++ b/blk/656
@@ -0,0 +1,16 @@
+OPAb (B665)
+CBI   SBI   SBIC  SBIS
+
+OPNA (B666)
+BREAK  CL[C,H,I,N,S,T,V,Z] SE[C,H,I,N,S,T,V,Z] EIJMP ICALL
+EICALL IJMP  NOP   RET   RETI  SLEEP WDR
+
+OPb (B667)
+BCLR  BSET
+
+OPRdb (B667)
+BLD   BST   SBRC  SBRS
+
+Special (B667,B670)
+CLR   TST   LSL   LD    ST
+                                                        (cont.)
diff --git a/blk/657 b/blk/657
new file mode 100644
index 0000000..6d305be
--- /dev/null
+++ b/blk/657
@@ -0,0 +1,6 @@
+Flow (B668)
+RJMP  RCALL
+BR[BC,BS,CC,CS,EQ,NE,GE,HC,HS,ID,IE,LO,LT,MI,PL,SH,TC,TS,VC,VS]
+
+Flow macros (B671)
+LBL! LBL, SKIP, TO, FLBL, FLBL! BEGIN, AGAIN? AGAIN, IF, THEN,