Start work on SuBAsm.

Also added support for moving the cursor arround.

1 files changed, 71 insertions, 21 deletions

diff --git a/test/input.s b/test/input.s
index b699dda..a2725f6 100644
--- a/test/input.s
+++ b/test/input.s
@@ -12,7 +12,10 @@ string2:
 	.byte "You typed, "
 end:
 	.byte $0
-
+x:
+	.word $0
+tmp:
+	.word $0
 ; Input buffer.
 .org $2000
 buffer:
@@ -26,7 +29,7 @@ reset:
 	ldy #$0
 clr_buf:
 	lda #$0
-	cpy.w #$400
+	cpy.w #$1000
 	beq start
 	sta buffer, y
 	iny
@@ -47,7 +50,6 @@ sleep:
 	lda end
 	bne spin	; Are we done with getting input?
 read:
-	nop		; Sleep until we get a character.
 	lda $C000	; Get control register.
 	beq rset_a	; Loop until we get a character.
 	lda #$0
@@ -63,17 +65,66 @@ print:
 
 getchar:
 	lda $C002	; Get typed character.
+	cmp #$1B
+	beq esc
 	cmp #$A
 	beq nl		; Did the user type a newline?
 	cmp #$8
 	beq bs		; Did the user type a backspace?
+	cmp #$7F
+	beq bs		; Did the user type a backspace?
 echo:
 	sta $C001	; Echo typed character.
 	sta buffer, y	; Store typed character into the input buffer.
 	iny		; Increment buffer offset.
-	nop
 	jmp rset_a	; We are not, so add the backspace to the buffer.
 
+esc:
+	lda $C000	; Skip the '['.
+	lda $C000	; Get the next character.
+	beq read	; We have an error, so discard it, and read the next character.
+	lda $C002	; Get the escape code.
+	cmp #$41	; Did the user press the up arrow?
+	beq up		; Yes, so move the cursor up.
+	cmp #$42	; Did the user press the down arrow?
+	beq down	; Yes, so move the cursor down.
+	cmp #$43	; Did the user press the right arrow?
+	beq right	; Yes, so move the cursor right.
+	cmp #$44	; Did the user press the left arrow?
+	beq left	; Yes, so move the cursor left.
+up:
+	lda #$1B
+	sta $C001
+	lda #$5B
+	sta $C001
+	lda #$41
+	sta $C001
+	jmp rset_a
+down:
+	lda #$1B
+	sta $C001
+	lda #$5B
+	sta $C001
+	lda #$42
+	sta $C001
+	jmp rset_a
+right:
+	lda #$1B
+	sta $C001
+	lda #$5B
+	sta $C001
+	lda #$43
+	sta $C001
+	jmp rset_a
+left:
+	lda #$1B
+	sta $C001
+	lda #$5B
+	sta $C001
+	lda #$44
+	sta $C001
+	jmp rset_a
+
 nl:
 	sta $C001
 	lda #$0		; Replace newline with a null terminator.
@@ -81,10 +132,17 @@ nl:
 	ldy.w #$0	; Reset y, to print the result.
 	jmp result
 
+back:
+	sta $C001	; Print backspace.
+	lda #$0		; Put a null terminator, in place of the backspace.
+	sta buffer, y	; Place it into the input buffer.
+	dey		; Decrement buffer offset.
+	jmp read	; Get next character.
+
 bs:
-	cpy #$0
-	beq return	; Are we at the start of the buffer?
-	jmp echo	; We are not, so add the backspace to the buffer.
+	cpy #$0		; Are we at the start of the buffer?
+	beq rset_a	; We are, so do not store the backspace into the buffer.
+	jmp back	; We are not, so add the backspace to the buffer.
 
 result:
 	lda string2, y
@@ -93,25 +151,18 @@ result:
 	iny		; Increment offset.
 	jmp result	; Keep printing.
 
+
 rset_y:
 	ldy.w #$0
 	jmp print_buf	; Print the input buffer.
 
 print_buf:
 	lda buffer, y	; Get a character from the input buffer.
-	beq fin		; Are we done with printing the buffer?
+	beq spin	; Are we done with printing the buffer?
 	sta $C001	; Print said character.
 	iny
 	jmp print_buf	; Keep printing the buffer.
 
-fin:
-	lda #$A		; Load a newline.
-	sta $C001	; Print the newline.
-	lda #$1		; Tell the program that we are done.
-	sta end		; We are done.
-	jmp sleep
-
-
 spin:
 	nop
 	nop
@@ -132,10 +183,9 @@ spin:
 
 .org $FFA0
 .qword irq_routine
-;.org $0
-;viewmem
-;.org $100
-;viewmem
+.org $8000
+viewmem
+.org $8100
+viewmem
 ;q
 done
-