diff --git a/Programs/CosmOS/Apps/Edit.asm b/Programs/CosmOS/Apps/Edit.asm
index d28e7fc..0ba9265 100644
--- a/Programs/CosmOS/Apps/Edit.asm
+++ b/Programs/CosmOS/Apps/Edit.asm
@@ -653,12 +653,12 @@ appendNode:
 
 ; DP2 is a two byte count. Takes one off it.
 takeOneOff:
-  DPUP.2 0d01
+  INCD.2
   LDA.2
   DECA
   STA.2
   BNC takeOneDone           ; No borrow, so the high half is untouched.
-  DPDN.2 0d01
+  DECD.2
   LDA.2
   DECA
   STA.2
@@ -766,12 +766,12 @@ printWord:
 
 ; DP0 is a two byte number, A is a byte. Adds the one to the other.
 addByteToWord:
-  DPUP.0 0d01
+  INCD.0
   LDB.0
   CCF
   ADD
   STQ.0
-  DPDN.0 0d01
+  DECD.0
   LDA.0
   RSTB
   ADD
diff --git a/Programs/CosmOS/Apps/Stream.asm b/Programs/CosmOS/Apps/Stream.asm
index baf6ae6..f724020 100644
--- a/Programs/CosmOS/Apps/Stream.asm
+++ b/Programs/CosmOS/Apps/Stream.asm
@@ -290,11 +290,11 @@ checksumLoop:
   INCD.2
   LDA.2
   BNA checksumLow
-  DPDN.2 0d01
+  DECD.2
   LDA.2
   DECA
   STA.2                     ; Borrow out of the high byte.
-  DPUP.2 0d01
+  INCD.2
   INIA 0xFF
   STA.2
   BRI checksumTest
@@ -333,7 +333,7 @@ stepIndex:
   INCA
   STA.2
   BNC stepIndexDone
-  DPDN.2 0d01
+  DECD.2
   LDA.2
   INCA
   STA.2
diff --git a/Programs/CosmOS/Assembler/Asm.asm b/Programs/CosmOS/Assembler/Asm.asm
index 5c5c4c2..9b6722a 100644
--- a/Programs/CosmOS/Assembler/Asm.asm
+++ b/Programs/CosmOS/Assembler/Asm.asm
@@ -735,7 +735,7 @@ emitStringLoop:
   CALL numStep
   SETD.1 EmitWalk
   LDD.0.1
-  DPDN.0 0d01
+  DECD.0
   LDA.0
   BNA emitStringLoop        ; The zero goes out with the rest and then stops the loop.
   BRI emitDone
diff --git a/Programs/CosmOS/Assembler/numbers.asm b/Programs/CosmOS/Assembler/numbers.asm
index 279284c..660c4f6 100644
--- a/Programs/CosmOS/Assembler/numbers.asm
+++ b/Programs/CosmOS/Assembler/numbers.asm
@@ -28,16 +28,16 @@ numSet:
 
 ; The two byte number at DP0 becomes itself plus the one at DP2.
 numAdd:
-  DPUP.0 0d01
-  DPUP.2 0d01
+  INCD.0
+  INCD.2
   LDA.0
   LDB.2
   CCF
   ADD
   MVQA
   STA.0
-  DPDN.0 0d01
-  DPDN.2 0d01
+  DECD.0
+  DECD.2
   LDA.0
   LDB.2
   ADD                       ; Carries in from the low half. Nothing between touches it.
@@ -47,16 +47,16 @@ numAdd:
 
 ; The two byte number at DP0 becomes itself less the one at DP2.
 numTake:
-  DPUP.0 0d01
-  DPUP.2 0d01
+  INCD.0
+  INCD.2
   LDA.0
   LDB.2
   CCF
   SUB
   MVQA
   STA.0
-  DPDN.0 0d01
-  DPDN.2 0d01
+  DECD.0
+  DECD.2
   LDA.0
   LDB.2
   SUB                       ; Borrows in from the low half.
@@ -66,14 +66,14 @@ numTake:
 
 ; Adds the byte in A to the two byte number at DP0.
 numAddByte:
-  DPUP.0 0d01
+  INCD.0
   LDB.0
   CCF
   ADD
   MVQA
   STA.0
   BNC numAddByteDone
-  DPDN.0 0d01
+  DECD.0
   LDA.0
   INCA
   STA.0
@@ -82,12 +82,12 @@ numAddByteDone:
 
 ; Adds one to the two byte number at DP0.
 numStep:
-  DPUP.0 0d01
+  INCD.0
   LDA.0
   INCA
   STA.0
   BNC numStepDone           ; It did not wrap, so the high byte is untouched.
-  DPDN.0 0d01
+  DECD.0
   LDA.0
   INCA
   STA.0
diff --git a/Programs/CosmOS/Source/cosmos.asm b/Programs/CosmOS/Source/cosmos.asm
index 700e780..eed37c7 100644
--- a/Programs/CosmOS/Source/cosmos.asm
+++ b/Programs/CosmOS/Source/cosmos.asm
@@ -262,7 +262,7 @@ dirCheck:
   ; A file's length is its block count times 256 plus its tail, which is the block count
   ; in the high byte and the tail in the low one. Nothing has to multiply anything.
   SETD.0 SbfsFileBlocks
-  DPUP.0 0d01
+  INCD.0
   LDA.0
   SETD.1 DirSize
   STA.1
@@ -1281,14 +1281,14 @@ breakAddress:
   SETD.0 SRegText
   PSHD.3
   POPD.1
-  DPUP.1 0d1
+  INCD.1
   CALL breakByte
 
   ; And which bits of it those are, since a debug dump that makes you look the number up is
   ; only half of one. Halt is not among them: the machine is plainly not halted.
   PSHD.3
   POPD.1
-  DPUP.1 0d1
+  INCD.1
   LDA.1
   PSHA
   INIB 0x01
@@ -2283,12 +2283,12 @@ assembleNeedsValue:
 
 ; DP0 is a two byte address and A is how far to move it on.
 stepCursor:
-  DPUP.0 0d01
+  INCD.0
   LDB.0
   CCF
   ADD
   STQ.0
-  DPDN.0 0d01
+  DECD.0
   LDA.0
   RSTB
   ADD
diff --git a/Programs/CosmOS/Source/sbfs.asm b/Programs/CosmOS/Source/sbfs.asm
index ddf23aa..e39871d 100644
--- a/Programs/CosmOS/Source/sbfs.asm
+++ b/Programs/CosmOS/Source/sbfs.asm
@@ -101,7 +101,7 @@ sbfsFind:
   SETD.1 SbfsBlock
   CALL sbfsCopyWord
   SETD.0 SbfsDirBlocks
-  DPUP.0 0d01
+  INCD.0
   LDA.0
   SETD.1 SbfsLeft
   STA.1                 ; Only the low byte: a directory of 256 blocks is 2048 files.
@@ -163,7 +163,7 @@ sbfsFindFound:
 
   PSHD.3
   POPD.0
-  DPUP.0 0d01
+  INCD.0
   SETD.1 SbfsFileStart
   CALL sbfsCopyWord
 
@@ -208,7 +208,7 @@ sbfsFirst:
   SETD.1 SbfsWalkBlock
   CALL sbfsCopyWord
   SETD.0 SbfsDirBlocks
-  DPUP.0 0d01
+  INCD.0
   LDA.0
   SETD.1 SbfsWalkLeft
   STA.1                 ; Only the low byte, the same as sbfsFind.
@@ -308,7 +308,7 @@ sbfsWalkEnd:
 sbfsWalkTake:
   SETD.1 SbfsWalkAt
   LDD.0.1
-  DPUP.0 0d01
+  INCD.0
   SETD.1 SbfsFileStart
   CALL sbfsCopyWord
 
@@ -428,7 +428,7 @@ sbfsRead:
   CALL sbfsCopyWord
 
   SETD.0 SbfsFileBlocks
-  DPUP.0 0d01
+  INCD.0
   LDA.0
   SETD.1 SbfsLeft
   STA.1
@@ -456,7 +456,7 @@ sbfsReadGot:
 
   ; On by a whole block. DPUP carries one byte at a time, so 256 takes two of them.
   DPUP.3 0xFF
-  DPUP.3 0x01
+  INCD.3
   SETD.0 SbfsBlock
   CALL sbfsStepWord
 
@@ -534,7 +534,7 @@ sbfsEntryBounds:
   POPD.3
   PSHD.3
   POPD.0
-  DPUP.0 0d01
+  INCD.0
   SETD.1 SbfsEntryStart
   CALL sbfsCopyWord
   SETD.0 SbfsEntryEnd
@@ -586,7 +586,7 @@ sbfsAllocTry:
   SETD.1 SbfsBlock
   CALL sbfsCopyWord
   SETD.0 SbfsDirBlocks
-  DPUP.0 0d01
+  INCD.0
   LDA.0
   SETD.1 SbfsLeft
   STA.1
@@ -682,16 +682,16 @@ sbfsSetWord:
 
 ; The two byte number at DP0 becomes itself less the one at DP2.
 sbfsSubWord:
-  DPUP.0 0d01
-  DPUP.2 0d01
+  INCD.0
+  INCD.2
   LDA.0
   LDB.2
   CCF
   SUB
   MVQA
   STA.0
-  DPDN.0 0d01
-  DPDN.2 0d01
+  DECD.0
+  DECD.2
   LDA.0
   LDB.2
   SUB                   ; Borrows in from the low half.
@@ -730,7 +730,7 @@ sbfsCreate:
   SETD.1 SbfsBlock
   CALL sbfsCopyWord
   SETD.0 SbfsDirBlocks
-  DPUP.0 0d01
+  INCD.0
   LDA.0
   SETD.1 SbfsLeft
   STA.1
@@ -781,7 +781,7 @@ sbfsCreateFill:
 
   PSHD.3
   POPD.1
-  DPUP.1 0d01
+  INCD.1
   SETD.0 SbfsFileStart
   CALL sbfsCopyWord
 
@@ -859,7 +859,7 @@ sbfsWriteFile:
   CALL sbfsSetWord
   CALL sbfsFileExtent
   SETD.0 SbfsWantBlocks
-  DPUP.0 0d01
+  INCD.0
   LDA.0
   SETD.1 SbfsLeft
   STA.1
@@ -872,7 +872,7 @@ sbfsWriteLoop:
   CALL sbfsWriteBlock
   BNQ sbfsWriteFailed
   DPUP.3 0xFF
-  DPUP.3 0x01
+  INCD.3
   SETD.0 SbfsBlock
   CALL sbfsStepWord
   SETD.0 SbfsLeft
@@ -983,12 +983,12 @@ sbfsCopyWord:
 
 ; Adds one to the two byte number at DP0.
 sbfsStepWord:
-  DPUP.0 0d01
+  INCD.0
   LDA.0
   INCA
   STA.0
   BNC sbfsStepDone      ; It did not wrap, so the high byte is untouched.
-  DPDN.0 0d01
+  DECD.0
   LDA.0
   INCA
   STA.0
@@ -998,16 +998,16 @@ sbfsStepDone:
 ; The two byte number at DP0 becomes itself plus the one at DP2. Only memory changes, so
 ; it survives the return: a routine cannot hand back a pointer or a register.
 sbfsAddWord:
-  DPUP.0 0d01
-  DPUP.2 0d01
+  INCD.0
+  INCD.2
   LDA.0
   LDB.2
   CCF
   ADD
   MVQA
   STA.0
-  DPDN.0 0d01
-  DPDN.2 0d01
+  DECD.0
+  DECD.2
   LDA.0
   LDB.2
   ADD                   ; Carries in from the low half. Nothing between the two touches it.
diff --git a/Programs/testPrograms/blitTest.asm b/Programs/testPrograms/blitTest.asm
index ee11e09..d22e405 100644
--- a/Programs/testPrograms/blitTest.asm
+++ b/Programs/testPrograms/blitTest.asm
@@ -179,7 +179,7 @@ refusedHandler:
   BRC refusedCarried
   RETI
 refusedCarried:
-  DPDN.0 0d01
+  DECD.0
   LDA.0
   INCA
   STA.0
diff --git a/Programs/testPrograms/controllerWriteTest.asm b/Programs/testPrograms/controllerWriteTest.asm
index b416c82..38a729a 100644
--- a/Programs/testPrograms/controllerWriteTest.asm
+++ b/Programs/testPrograms/controllerWriteTest.asm
@@ -102,7 +102,7 @@ stepPastRefusal:
   BRC carried
   RETI
 carried:
-  DPDN.0 0d01
+  DECD.0
   LDA.0
   INCA
   STA.0
diff --git a/Programs/testPrograms/faultResumeTest.asm b/Programs/testPrograms/faultResumeTest.asm
index a4d2b4f..795f972 100644
--- a/Programs/testPrograms/faultResumeTest.asm
+++ b/Programs/testPrograms/faultResumeTest.asm
@@ -41,7 +41,7 @@ faultHandler:
   RETI
 
 carried:
-  DPDN.0 0d01
+  DECD.0
   LDA.0
   INCA
   STA.0
diff --git a/Programs/testPrograms/fenceTest.asm b/Programs/testPrograms/fenceTest.asm
index 3c2e3d9..9664bb6 100644
--- a/Programs/testPrograms/fenceTest.asm
+++ b/Programs/testPrograms/fenceTest.asm
@@ -143,7 +143,7 @@ guardHandler:
   BRC stepCarried
   RETI
 stepCarried:
-  DPDN.0 0d01
+  DECD.0
   LDA.0
   INCA
   STA.0
diff --git a/Programs/testPrograms/refusalTest.asm b/Programs/testPrograms/refusalTest.asm
index 82ab88e..966dff0 100644
--- a/Programs/testPrograms/refusalTest.asm
+++ b/Programs/testPrograms/refusalTest.asm
@@ -50,7 +50,7 @@ refusalHandler:
   RETI
 
 carried:
-  DPDN.0 0d01
+  DECD.0
   LDA.0
   INCA
   STA.0
diff --git a/Programs/testPrograms/registerBankTest.asm b/Programs/testPrograms/registerBankTest.asm
index 8d37892..8f4bfb6 100644
--- a/Programs/testPrograms/registerBankTest.asm
+++ b/Programs/testPrograms/registerBankTest.asm
@@ -114,7 +114,7 @@ bankHandler:
   BRC bankCarried
   RETI
 bankCarried:
-  DPDN.0 0d01
+  DECD.0
   LDA.0
   INCA
   STA.0
diff --git a/Programs/testPrograms/sbfsReadTest.asm b/Programs/testPrograms/sbfsReadTest.asm
index fa8c0fd..852f53b 100644
--- a/Programs/testPrograms/sbfsReadTest.asm
+++ b/Programs/testPrograms/sbfsReadTest.asm
@@ -89,7 +89,7 @@ showFound:
 showContents:
   SETD.0 Landing
   SETD.1 SbfsFileBlocks
-  DPUP.1 0d01
+  INCD.1
   LDA.1
   SETD.1 LeftHigh
   STA.1
diff --git a/Programs/testPrograms/sbfsWalkTest.asm b/Programs/testPrograms/sbfsWalkTest.asm
index a08c0c0..c8c24e1 100644
--- a/Programs/testPrograms/sbfsWalkTest.asm
+++ b/Programs/testPrograms/sbfsWalkTest.asm
@@ -60,7 +60,7 @@ walkCheck:
   ; A file is its blocks times 256 plus its tail, which is the block count in the high
   ; byte and the tail in the low one. Nothing has to multiply anything.
   SETD.0 SbfsFileBlocks
-  DPUP.0 0d01
+  INCD.0
   LDA.0
   SETD.1 Size
   STA.1
diff --git a/Programs/testPrograms/stackPointerTest.asm b/Programs/testPrograms/stackPointerTest.asm
index f28cb7c..0bd2a05 100644
--- a/Programs/testPrograms/stackPointerTest.asm
+++ b/Programs/testPrograms/stackPointerTest.asm
@@ -24,7 +24,7 @@ start:
   ; The Stack Pointer points at the next free slot, so the byte pushed last sits one
   ; above it, and the one before that sits two above.
   MVSD.0
-  DPUP.0 0d01
+  INCD.0
   LDA.0             ; 'K', the last one pushed.
   INCD.0
   LDB.0             ; 'O', the one before it.