diff --git a/blk/001 b/blk/001
index 7a7b3b9..feb2f30 100644
--- a/blk/001
+++ b/blk/001
@@ -3,11 +3,10 @@ MASTER INDEX
 005 Z80 assembler             030 8086 assembler
 050 AVR assembler             70-99 unused
 100 Block editor              120 Visual Editor
-160-259 unused                260 Cross compilation
+160 AVR SPI programmer
+170-259 unused                260 Cross compilation
 280 Z80 boot code             350 Core words
 410 PS/2 keyboard subsystem   420 SD Card subsystem
 440-519 unused                520 Fonts
-550-689 unused
-690 AVR SPI programmer
-700-799 unused
+550-799 unused
 800 8086 boot code
diff --git a/blk/691 b/blk/160
similarity index 91%
rename from blk/691
rename to blk/160
index 851d921..20afd35 100644
--- a/blk/691
+++ b/blk/160
@@ -1,3 +1,4 @@
+( AVR Programmer, load range 160-162. doc/avr.txt )
 ( page size in words, 64 is default on atmega328P )
 CREATE aspfpgsz 64 ,
 VARIABLE aspprevx
diff --git a/blk/692 b/blk/161
similarity index 100%
rename from blk/692
rename to blk/161
diff --git a/blk/693 b/blk/162
similarity index 100%
rename from blk/693
rename to blk/162
diff --git a/blk/650 b/blk/650
deleted file mode 100644
index 0bde4f0..0000000
--- a/blk/650
+++ /dev/null
@@ -1,5 +0,0 @@
-AVR assembler
-
-651 Guide                      655 Instructions list
-660 Loader                     661-672 Code
-672 Common AVR consts
diff --git a/blk/651 b/blk/651
deleted file mode 100644
index b29b7fa..0000000
--- a/blk/651
+++ /dev/null
@@ -1,16 +0,0 @@
-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.)
diff --git a/blk/652 b/blk/652
deleted file mode 100644
index 76f5678..0000000
--- a/blk/652
+++ /dev/null
@@ -1,9 +0,0 @@
-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
deleted file mode 100644
index bf77661..0000000
--- a/blk/655
+++ /dev/null
@@ -1,16 +0,0 @@
-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
deleted file mode 100644
index db63709..0000000
--- a/blk/656
+++ /dev/null
@@ -1,16 +0,0 @@
-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
deleted file mode 100644
index 6d305be..0000000
--- a/blk/657
+++ /dev/null
@@ -1,6 +0,0 @@
-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,
diff --git a/blk/690 b/blk/690
deleted file mode 100644
index 27feaaa..0000000
--- a/blk/690
+++ /dev/null
@@ -1,7 +0,0 @@
-AVR SPI programmer
-
-This program allows you to access AVR chips Flash memory, EEPROM
-and fuses using a SPI relay. This requires drivers that imple-
-ment the SPI Relay protocol.
-
-Load range: B691-B693
diff --git a/doc/avr.txt b/doc/avr.txt
index a73108f..1717492 100644
--- a/doc/avr.txt
+++ b/doc/avr.txt
@@ -1,11 +1,9 @@
-# Working with AVR microcontrollers
-
-# Assembling AVR binaries
-
-TODO
-
 # Programming AVR chips
 
+(In this documentation, you are expected to have an AVR binary
+ready to send. To assemble an AVR binary from source, see
+asm.txt)
+
 To program AVR chips, you need a device that provides the SPI
 protocol. The device built in the rc2014/sdcard recipe fits the
 bill. Make sure you can override the SPI clock because the sys-
@@ -18,7 +16,7 @@ to proper AVR pins as described in the MCU's datasheet. Note
 that this device will be the same as the one you'll use for any
 modern SPI-based AVR programmer, with RESET replacing SS.
 
-The AVR programming code is at B690.
+The AVR programming code is at B160.
 
 Before you begin programming the chip, the device must be desel-
 ected. Ensure with "0 (spie)".