apps/README.md

@@ -104,8 +104,3 @@ Symbols have a different meaning depending on the application. In zasm, it's
 labels and constants. In basic, it's variables.
 
 Expressions can't contain spaces.
-
-Expressions can have an empty left operand. It will then be considered as 0.
-This allows signed integers, for example, `-42` to be expressed as expected.
-That form doesn't work well everywhere and is mostly supported for BASIC. In
-zasm, you're safer with `0-42`.

apps/basic/README.md

@@ -47,12 +47,10 @@ by typing a whitespace.
 
 ### Numbers, expressions and variables
 
-Numbers are stored in memory as 16-bit integers (little endian) and numbers
+Only 16-bit integers (unsigned for now) are supported in this BASIC. When
-being represented by BASIC are expressed as signed integers, in decimal form.
+printed, they're printed in decimal form. When expressing number literals, you
-Line numbers, however, are expressed and treated as unsigned integers: You can,
+can do so either in multiple forms. . See "Number literals" in `apps/README.md`
-if you want, put something on line "-1", but it will be the equivalent of line
+for details.
-65535. When expressing number literals, you can do so either in multiple forms.
-See "Number literals" in `apps/README.md` for details.
 
 Expressions are accepted wherever a number is expected. For example,
 `print 2+3` will print `5`.  See "Expressions" in `apps/README.md`.

apps/basic/main.asm

@@ -192,7 +192,7 @@ basPRINT:
 	jr	nz, .parseError
 	push	ix \ pop de
 	ld	hl, SCRATCHPAD
-	call	fmtDecimalS
+	call	fmtDecimal
 	call	printstr
 	pop	hl		; <-- lvl 1
 .chkAnother:

apps/lib/expr.asm

@@ -97,16 +97,8 @@ _findAndSplit:
 ; parse expression on the left (HL) and the right (DE) and put the results in
 ; HL (left) and DE (right)
 _resolveLeftAndRight:
-	; special case: is (HL) zero? If yes, it means that our left operand
-	; is empty. consider it as 0
-	ld	ix, 0		; pre-set to 0
-	ld	a, (hl)
-	or	a
-	jr	z, .skip
-	; Parse left operand in (HL)
 	call	parseExpr
 	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.

apps/lib/fmt.asm

@@ -1,25 +1,4 @@
 
-; Same as fmtDecimal, but DE is considered a signed number
-fmtDecimalS:
-	bit	7, d
-	jr	z, fmtDecimal	; unset, not negative
-	; Invert DE. spit '-', unset bit, then call fmtDecimal
-	push	de
-	ld	a, '-'
-	ld	(hl), a
-	inc	hl
-	ld	a, d
-	cpl
-	ld	d, a
-	ld	a, e
-	cpl
-	ld	e, a
-	inc	de
-	call	fmtDecimal
-	dec	hl
-	pop	de
-	ret
-
 ; Format the number in DE into the string at (HL) in a decimal form.
 ; Null-terminated. DE is considered an unsigned number.
 fmtDecimal:

tools/emul/README.md

@@ -57,18 +57,3 @@ memory starting at address 0 and then run the code until it halts. The exit
 code of the program is the value of `A` when the program halts.
 
 This is used for unit tests.
-
-## Problems?
-
-If the libz80-wrapped zasm executable works badly (hangs, spew garbage, etc.),
-it's probably because you've broken your bootstrap binaries. They're easy to
-mistakenly break. To verify if you've done that, look at your git status. If
-`kernel.bin` or `zasm.bin` are modified, try resetting them and then run
-`make clean all`. Things should go better afterwards.
-
-If that doesn't work, there's also the nuclear option of `git reset --hard`
-and `git clean -fxd`.
-
-If that still doesn't work, it might be because the current commit you're on
-is broken, but that is rather rare: the repo on Github is plugged on Travis
-and it checks that everything is smooth.

tools/tests/unit/test_expr.asm

@@ -149,8 +149,6 @@ testParseExpr:
 	call	.testEQ
 	ld	iy, .t7
 	call	.testEQ
-	ld	iy, .t8
-	call	.testEQ
 	ret
 
 .testEQ:
@@ -188,9 +186,6 @@ testParseExpr:
 .t7:
 	.dw	0xcfb8
 	.db	"0x99f7{3", 0
-.t8:
-	.dw	0xffff
-	.db	"-1", 0
 
 nexttest:
 	ld	a, (testNum)

tools/tests/unit/test_lib_fmt.asm

@@ -11,7 +11,6 @@ test:
 	ld	sp, 0xffff
 
 	call	testFmtDecimal
-	call	testFmtDecimalS
 
 	; success
 	xor	a
@@ -56,30 +55,6 @@ testFmtDecimal:
 	.dw 0xffff
 	.db "65535", 0
 
-testFmtDecimalS:
-	ld	ix, .t1
-	call	.test
-	ld	ix, .t2
-	call	.test
-	ret
-.test:
-	ld	e, (ix)
-	ld	d, (ix+1)
-	ld	hl, sandbox
-	call	fmtDecimalS
-	ld	hl, sandbox
-	push	ix \ pop de
-	inc	de \ inc de
-	call	strcmp
-	jp	nz, fail
-	jp	nexttest
-.t1:
-	.dw 1234
-	.db "1234", 0
-.t2:
-	.dw 0-1234
-	.db "-1234", 0
-
 nexttest:
 	ld	a, (testNum)
 	inc	a