diff --git a/apps/basic/main.asm b/apps/basic/main.asm
index 5317513..bd444bb 100644
--- a/apps/basic/main.asm
+++ b/apps/basic/main.asm
@@ -222,7 +222,7 @@ basPRINT:
 	call	rdWord
 	push	hl		; --> lvl 1
 	ex	de, hl
-	call	parseExprDE
+	call	parseExpr
 	jr	nz, .parseError
 	ld	hl, SCRATCHPAD
 	call	fmtDecimalS
@@ -251,7 +251,7 @@ basGOTO:
 	ld	de, SCRATCHPAD
 	call	rdWord
 	ex	de, hl
-	call	parseExprDE
+	call	parseExpr
 	ret	nz
 	call	bufFind
 	jr	nz, .notFound
@@ -314,7 +314,7 @@ basINPUT:
 	call	spitQuoted
 	call	rdSep
 	call	stdioReadLine
-	call	parseExprDE
+	call	parseExpr
 	ld	(VAR_TBL), de
 	call	printcrlf
 	cp	a		; ensure Z
diff --git a/apps/basic/parse.asm b/apps/basic/parse.asm
index a0f8511..6af0a50 100644
--- a/apps/basic/parse.asm
+++ b/apps/basic/parse.asm
@@ -40,7 +40,7 @@ parseTruth:
 	ret
 
 .simple:
-	call	parseExprDE
+	call	parseExpr
 	jr	nz, .end
 	ld	a, d
 	or	e
@@ -132,11 +132,11 @@ parseTruth:
 .parseLeftRight:
 	; let's start with HL
 	push	de		; --> lvl 1
-	call	parseExprDE
+	call	parseExpr
 	pop	hl		; <-- lvl 1, orig DE
 	ret	nz
 	push	de		; --> lvl 1. save HL value in stack.
 	; Now, for DE. (DE) is now in HL
-	call	parseExprDE	; DE in place
+	call	parseExpr	; DE in place
 	pop	hl		; <-- lvl 1. restore saved HL
 	ret
diff --git a/apps/basic/tok.asm b/apps/basic/tok.asm
index d0c9f3e..3631a59 100644
--- a/apps/basic/tok.asm
+++ b/apps/basic/tok.asm
@@ -91,7 +91,7 @@ rdExpr:
 	call	rdWord
 	push	hl
 	ex	de, hl
-	call	parseExprDE
+	call	parseExpr
 	push	de \ pop ix
 	pop	hl
 	ret
diff --git a/apps/basic/var.asm b/apps/basic/var.asm
index a6f7af6..a10a2be 100644
--- a/apps/basic/var.asm
+++ b/apps/basic/var.asm
@@ -52,7 +52,7 @@ varTryAssign:
 	call	rdWord
 	ex	de, hl
 	; Now, evaluate that expression now in (HL)
-	call	parseExprDE	; --> number in DE
+	call	parseExpr	; --> number in DE
 	jr	nz, .exprErr
 	pop	af	; <-- lvl 4
 	call	varAssign
diff --git a/apps/lib/expr.asm b/apps/lib/expr.asm
index 3a17a43..75a7559 100644
--- a/apps/lib/expr.asm
+++ b/apps/lib/expr.asm
@@ -11,25 +11,12 @@
 ;
 ; *** Code ***
 ;
-; Parse expression in string at (HL) and returns the result in IX.
+
+; Parse expression in string at (HL) and returns the result in DE.
 ; **This routine mutates (HL).**
 ; We expect (HL) to be disposable: we mutate it to avoid having to make a copy.
 ; Sets Z on success, unset on error.
-; TODO: the IX output register is a bit awkward. Nearly everywhere, I need
-;       to push \ pop that thing. See if we could return the result in DE
-;       instead.
 parseExpr:
-	push	de
-	push	hl
-	call	_parseExpr
-	pop	hl
-	pop	de
-	ret
-
-; Same as parseExpr, but preserves IX and puts result in DE. This is a
-; transitionary routine and will replace parseExpr when everyone has jumped
-; ship.
-parseExprDE:
 	push	ix
 	push	hl
 	call	_parseExpr
@@ -116,17 +103,18 @@ _resolveLeftAndRight:
 	or	a
 	jr	z, .skip
 	; Parse left operand in (HL)
+	push	de		; --> lvl 1
 	call	parseExpr
+	pop	hl		; <-- lvl 1, orig DE
 	ret	nz		; return immediately if error
 .skip:
 	; Now we have parsed everything to the left and we have its result in
-	; IX. What we need to do now is the same thing on (DE) and then apply
-	; the + operator. Let's save IX somewhere and parse this.
-	ex	de, hl	; right expr now in HL
-	push	ix	; --> lvl 1
-	call	parseExpr
-	pop	hl	; <-- lvl 1. left
-	push	ix \ pop de	; right
+	; DE. What we need to do now is the same thing on (DE) and then apply
+	; the + operator. Let's save DE somewhere and parse this.
+	push	de	; --> lvl 1
+	; right expr in (HL)
+	call	parseExpr	; DE is set
+	pop	hl	; <-- lvl 1. left value
 	ret		; Z is parseExpr's result
 
 ; Routines in here all have the same signature: they take two numbers, DE (left)
diff --git a/apps/zasm/avr.asm b/apps/zasm/avr.asm
index 2f559bd..7137614 100644
--- a/apps/zasm/avr.asm
+++ b/apps/zasm/avr.asm
@@ -644,7 +644,7 @@ _readK8:
 
 _readDouble:
 	push	de
-	call	parseExprDE
+	call	parseExpr
 	jr	nz, .end
 	ld	b, d
 	ld	c, e
@@ -658,7 +658,7 @@ _readk7:
 	push	hl
 	push	de
 	push	ix
-	call	parseExprDE
+	call	parseExpr
 	jr	nz, .end
 	; If we're in first pass, stop now. The value of HL doesn't matter and
 	; truncation checks might falsely fail.
@@ -742,7 +742,7 @@ _readExpr:
 	push	de
 	push	bc
 	ld	b, a
-	call	parseExprDE
+	call	parseExpr
 	jr	nz, .end
 	ld	a, b
 	call	_DE2A
diff --git a/apps/zasm/directive.asm b/apps/zasm/directive.asm
index 303dea3..270c9a1 100644
--- a/apps/zasm/directive.asm
+++ b/apps/zasm/directive.asm
@@ -48,7 +48,7 @@ handleDB:
 	ld	hl, scratchpad
 	call	enterDoubleQuotes
 	jr	z, .stringLiteral
-	call	parseExprDE
+	call	parseExpr
 	jr	nz, .badarg
 	ld	a, d
 	or	a		; cp 0
@@ -96,7 +96,7 @@ handleDW:
 	call	readWord
 	jr	nz, .badfmt
 	ld	hl, scratchpad
-	call	parseExprDE
+	call	parseExpr
 	jr	nz, .badarg
 	ld	a, e
 	call	ioPutB
@@ -148,7 +148,7 @@ handleEQU:
 	call	readWord
 	jr	nz, .badfmt
 	ld	hl, scratchpad
-	call	parseExprDE
+	call	parseExpr
 	jr	nz, .badarg
 	ld	hl, DIREC_SCRATCHPAD
 	; Save value in "@" special variable
@@ -183,7 +183,7 @@ handleORG:
 	push	de
 	call	readWord
 	jr	nz, .badfmt
-	call	parseExprDE
+	call	parseExpr
 	jr	nz, .badarg
 	ex	de, hl
 	ld	(DIREC_LASTVAL), hl
@@ -204,7 +204,7 @@ handleORG:
 handleFIL:
 	call	readWord
 	jr	nz, .badfmt
-	call	parseExprDE
+	call	parseExpr
 	jr	nz, .badarg
 	ld	a, d
 	cp	0xd0
@@ -243,7 +243,7 @@ handleOUT:
 	call	zasmIsFirstPass		; No .out during first pass
 	jr	z, .end
 	ld	hl, scratchpad
-	call	parseExprDE
+	call	parseExpr
 	jr	nz, .badarg
 	ld	a, d
 	out	(ZASM_DEBUG_PORT), a
diff --git a/apps/zasm/instr.asm b/apps/zasm/instr.asm
index 7cfdea5..da0ff64 100644
--- a/apps/zasm/instr.asm
+++ b/apps/zasm/instr.asm
@@ -246,7 +246,7 @@ parseArg:
 	ld	de, 0			; in first pass, return a clean zero
 	call	zasmIsFirstPass
 	ret	z
-	jp	parseExprDE
+	jp	parseExpr
 
 ; Returns, with Z, whether A is a groupId
 isGroupId:
diff --git a/tools/tests/unit/test_expr.asm b/tools/tests/unit/test_expr.asm
index 260d42a..42f6b50 100644
--- a/tools/tests/unit/test_expr.asm
+++ b/tools/tests/unit/test_expr.asm
@@ -52,14 +52,14 @@ test:
 
 	; Old-style tests, not touching them now.
 	ld	hl, s1
-	call	parseExprDE
+	call	parseExpr
 	call	assertZ
 	ld	hl, 4
 	call	assertEQW
 	call	nexttest
 
 	ld	hl, s2
-	call	parseExprDE
+	call	parseExpr
 	call	assertZ
 	ld	hl, 0x4023
 	call	assertEQW
@@ -77,28 +77,28 @@ test:
 	jp	nz, fail
 
 	ld	hl, s3
-	call	parseExprDE
+	call	parseExpr
 	call	assertZ
 	ld	hl, 0x4020
 	call	assertEQW
 	call	nexttest
 
 	ld	hl, s4
-	call	parseExprDE
+	call	parseExpr
 	call	assertZ
 	ld	hl, 0x60
 	call	assertEQW
 	call	nexttest
 
 	ld	hl, s5
-	call	parseExprDE
+	call	parseExpr
 	call	assertZ
 	ld	hl, 0x3ffd
 	call	assertEQW
 	call	nexttest
 
 	ld	hl, s6
-	call	parseExprDE
+	call	parseExpr
 	call	assertZ
 	ld	hl, 0x4080
 	call	assertEQW
@@ -132,7 +132,7 @@ testParseExpr:
 .testEQ:
 	push	iy \ pop hl
 	inc	hl \ inc hl
-	call	parseExprDE
+	call	parseExpr
 	call	assertZ
 	ld	l, (iy)
 	ld	h, (iy+1)