diff --git a/audit/audit.dsk b/audit/audit.dsk
index 42a6340..56b2c1d 100644
Binary files a/audit/audit.dsk and b/audit/audit.dsk differ
diff --git a/audit/langcard.asm b/audit/langcard.asm
index 0986c8c..6865c9a 100644
--- a/audit/langcard.asm
+++ b/audit/langcard.asm
@@ -2,6 +2,7 @@
 ;;; Copyright © 2016 Zellyn Hunter <zellyn@gmail.com>
 
 	!zone langcard {
+
 	lda MEMORY
 	cmp #49
 	bcs +
@@ -10,10 +11,10 @@
 	+printed
 	beq .done2
 	;; Setup - store differing values in bank first and second banked areas.
-+	lda $C08B		; Read and write First 4K bank
++	lda $C08B		; Read and write bank 1
 	lda $C08B
 	lda #$55
-	sta $D17B		; D17B is $53 in Apple II/plus/e/enhanced
+	sta $D17B		; $D17B is $53 in Apple II/plus/e/enhanced
 	cmp $D17B
 	beq +
 	+prerr $0003 ;; E0003: We tried to put the language card into read bank 1, write bank 1, but failed to write.
@@ -27,7 +28,7 @@
 	!text "CANNOT WRITE TO LC RAM"
 	+prerred
 	beq .done2
-+	lda $C083		; Read and write Second 4K bank
++	lda $C083		; Read and write bank 2
 	lda $C083
 	lda #$AA
 	sta $D17B
@@ -40,7 +41,7 @@
 
 	;; Test that we're reading the right things
 	
-+	lda $C088		; RAM read, bank 1
++	lda $C088		; RAM read, bank 1, write disabled
 	lda $D17B
 	cmp #$55
 	beq ++
@@ -49,26 +50,26 @@
 	+prerr $0006 ;; E0006: Read $C088 (read bank 1), but the language card is still reading bank 2.
 	!text "$C088: BANK 2 ACTIVE"
 	+prerred
-.done2	beq .done3
+	beq .done2
 +	cmp #$53
 	bne +
 	+prerr $0007 ;; E0007: Read $C088 (read bank 1), but the language card is reading ROM.
 	!text "$C088: ROM ACTIVE"
 	+prerred
-	beq .done3
+	beq .done2
 +	+prerra $0008 ;; E0008: Read $C088 (read bank 1), but the check byte ($D17B) is an unknown value.
 	!text "$C088: UNKNOWN BYTE"
 	+prerred
-	beq .done3
-++	dec $D17B
+	beq .done2
+++	inc $D17B
 	eor $D17B
 	beq +
 	+prerr $0009 ;; E0009: Read $C088 (read bank 1, write-protected), but successfully wrote byte ($D17B).
 	!text "$C088: ALLOWED WRITE"
 	+prerred
-	beq .done3
+.done2	beq .done3
 
-+	lda $C080		; RAM read, bank 2
++	lda $C080		; RAM read, bank 2, write disabled
 	lda $D17B
 	cmp #$AA
 	beq ++
@@ -87,16 +88,16 @@
 +	+prerra $000C ;; E000C: Read $C080 (read bank 2), but the check byte ($D17B) is an unknown value.
 	!text "$C080: UNKNOWN BYTE"
 	+prerred
-.done3	beq .done4
-++	dec $D17B
+	beq .done3
+++	inc $D17B
 	eor $D17B
 	beq +
 	+prerr $000D ;; E000D: Read $C080 (read bank 2, write-protected), but successfully wrote byte ($D17B).
 	!text "$C080: ALLOWED WRITE"
 	+prerred
-	beq .done4
+	beq .done3
 
-+	lda $C081		; ROM read
++	lda $C081		; ROM read, bank 2 no write
 	lda $D17B
 	cmp #$53
 	beq ++
@@ -105,26 +106,26 @@
 	+prerr $000E ;; E000E: Read $C081 (read ROM), but the language card is still reading bank 1.
 	!text "$C081: BANK 1 ACTIVE"
 	+prerred
-	beq .done4
+	beq .done3
 +	cmp #$AA
 	bne +
 	+prerr $000F ;; E000F: Read $C081 (read ROM), but the language card is reading bank 2.
 	!text "$C081: BANK 1 ACTIVE"
 	+prerred
-	beq .done
+	beq .done3
 +	+prerra $0010 ;; E0010: Read $C081 (read ROM), but the check byte ($D17B) is an unknown value.
 	!text "$C081: UNKNOWN BYTE"
 	+prerred
-	beq .done
+	beq .done3
 ++	dec $D17B
 	eor $D17B
 	beq +
 	+prerr $0011 ;; E0011: Read $C081 (read ROM), but successfully modified byte ($D17B).
 	!text "$C081: ALLOWED WRITE"
 	+prerred
-	beq .done
+.done3	beq .done4
 
-+	lda $C089		; ROM read
++	lda $C089		; ROM read, bank 1 write
 	lda $D17B
 	cmp #$53
 	beq ++
@@ -133,53 +134,81 @@
 	+prerr $0012 ;; E0012: Read $C089 (read ROM), but the language card is still reading bank 1.
 	!text "$C089: BANK 1 ACTIVE"
 	+prerred
-	beq .done
+	beq .done4
 +	cmp #$AA
 	bne +
 	+prerr $0013 ;; E0013: Read $C089 (read ROM), but the language card is reading bank 2.
 	!text "$C089: BANK 1 ACTIVE"
 	+prerred
-	beq .done
+	beq .done4
 +	+prerra $0014 ;; E0014: Read $C089 (read ROM), but the check byte ($D17B) is an unknown value.
 	!text "$C089: UNKNOWN BYTE"
 	+prerred
-	beq .done
-++	dec $D17B
+	beq .done4
+++	inc $D17B		; bank 1 now holds $54 instead of $55
 	eor $D17B
 	beq +
 	+prerr $0015 ;; E0015: Read $C089 (read ROM), but successfully modified byte ($D17B).
 	!text "$C089: ALLOWED WRITE"
 	+prerred
-.done4	beq .done
+	beq .done4
 
 +	lda $C08B		; RAM read, bank 1
 	lda $D17B
-	cmp #$55
+	cmp #$54
 	beq ++
 	cmp #$AA
 	bne +
 	+prerr $0016 ;; E0016: Read $C08B (read bank 1), but the language card is still reading bank 2.
 	!text "$C08B: BANK 2 ACTIVE"
 	+prerred
-	beq .done
+	beq .done4
 +	cmp #$53
 	bne +
 	+prerr $0017 ;; E0017: Read $C08B (read bank 1), but the language card is reading ROM.
 	!text "$C08B: ROM ACTIVE"
 	+prerred
-	beq .done
-+	cmp #$54
+	beq .done4
++	cmp #$55
 	bne +
-	+prerr $0018 ;; E0018: Read $C08B (read bank 1), but byte was previously decremented during single-read $C089 or $C081 phase, which should have Write-protected RAM.
-	!text "$C08B: PREVIOUS WRITE SUCCEEDED"
+	+prerr $0018 ;; E0018: Read $C08B (read bank 1); byte should have been previously incremented from ROM ($53) to $54 because of lda $C089 after previous lda $C081.
+	!text "$C08B: PREVIOUS WRITE FAILED"
 	+prerred
-	beq .done
+	beq .done4
 +	+prerra $0019 ;; E0019: Read $C08B (read bank 1), but the check byte ($D17B) is an unknown value.
 	!text "$C08B: UNKNOWN BYTE"
 	+prerred
-	beq .done
+.done4	beq .done5
 ++
-	
+
++	lda $C083		; RAM read, bank 2
+	lda $D17B
+	cmp #$AA
+	beq ++
+	cmp #$54
+	bne +
+	+prerr $001A ;; E001A: Read $C083 (read bank 2), but the language card is still reading bank 1.
+	!text "$C083: BANK 1 ACTIVE"
+	+prerred
+	beq .done5
++	cmp #$53
+	bne +
+	+prerr $001B ;; E001B: Read $C083 (read bank 2), but the language card is reading ROM.
+	!text "$C083: ROM ACTIVE"
+	+prerred
+	beq .done5
++	cmp #$52
+	bne +
+	+prerr $001C ;; E001C: Read $C083 (read bank 2); byte should have been previously NOT been writable to be decremented from ROM ($53) to $52 because of single lda $C081 after previous lda $C080.
+	!text "$C083: PREVIOUS WRITE SUCCEEDED"
+	+prerred
+	beq .done5
++	+prerra $001D ;; E001D: Read $C083 (read bank 2), but the check byte ($D17B) is an unknown value.
+	!text "$C083: UNKNOWN BYTE"
+	+prerred
+.done5	jmp .done
+++
+
 	;; Success
 	+print
 	!text "LANGUAGE CARD TESTS SUCCEEDED",$8D
diff --git a/audit/macros.asm b/audit/macros.asm
index 895459e..c1aeca0 100644
--- a/audit/macros.asm
+++ b/audit/macros.asm
@@ -15,6 +15,8 @@
 	}
 
 	!macro prerr NUM {
+	ldy #>NUM
+	ldx #<NUM
 	jsr LASTSTRING
 	!set TEMP = *
 	* = LASTSTRING
diff --git a/audit/notes.org b/audit/notes.org
index b249b7e..7c607aa 100644
--- a/audit/notes.org
+++ b/audit/notes.org
@@ -23,3 +23,16 @@ D768 85
 D76E 65
 * Links to things to test
 ** TODO [[https://groups.google.com/d/msg/comp.sys.apple2/RMnus8p6xp8/TDfD2HVtDwAJ][csa2: question on HGR behavior with enhanced 128K Apple //e]]
+* Language card operation
+
+
+| Bank 2 | Bank 1 |     | Action     | RAM          | Alt Bank 2 | Alt Bank 1 |
+|--------+--------+-----+------------+--------------+------------+------------|
+| C080   | C088   | R/W | WRTCOUNT=0 | READ ENABLE  | C084       | C08C       |
+| C081   | C089   | R   | WRTCOUNT++ | READ DISABLE | C085       | C08D       |
+|        |        | W   | WRTCOUNT=0 | READ DISABLE |            |            |
+| C082   | C08A   | R/W | WRTCOUNT=0 | READ DISABLE | C086       | C08E       |
+| C083   | C08B   | R   | WRTCOUNT++ | READ ENABLE  | C087       | C08F       |
+|        |        | W   | WRTCOUNT=0 | READ ENABLE  |            |            |
+Writing to high RAM is enabled when WRTCOUNT >= 2
+Source: UtA2e, pg 5-24.
diff --git a/v0/index.md b/v0/index.md
index a1e4f2a..590b176 100644
--- a/v0/index.md
+++ b/v0/index.md
@@ -94,8 +94,24 @@ Read $C08B (read bank 1), but the language card is reading ROM.
 
 ## E0018
 
-Read $C08B (read bank 1), but byte was previously decremented during single-read $C089 or $C081 phase, which should have Write-protected RAM.
+Read $C08B (read bank 1); byte should have been previously incremented from ROM ($53) to $54 because of lda $C089 after previous lda $C081.
 
 ## E0019
 
 Read $C08B (read bank 1), but the check byte ($D17B) is an unknown value.
+
+## E001A
+
+Read $C083 (read bank 2), but the language card is still reading bank 1.
+
+## E001B
+
+Read $C083 (read bank 2), but the language card is reading ROM.
+
+## E001C
+
+Read $C083 (read bank 2); byte should have been previously NOT been writable to be decremented from ROM ($53) to $52 because of single lda $C081 after previous lda $C080.
+
+## E001D
+
+Read $C083 (read bank 2), but the check byte ($D17B) is an unknown value.