X-Git-Url: http://git.joshuawise.com/fpgaboy.git/blobdiff_plain/1eefdc8e89a69963b1c1a084fe4ecec844997293..298e8085b4f8f70121204fa4aed3a188034f6879:/fpgaboot.asm

diff --git a/fpgaboot.asm b/fpgaboot.asm
index 4a1089f..0a714b1 100644
--- a/fpgaboot.asm
+++ b/fpgaboot.asm
@@ -7,34 +7,22 @@ boot:	ld a, $AA
 	ld hl, signon
 	call puts
 	
-	; Write a little bit to the RAM
-	ld hl, $0104
-	xor a
-	ld [HLI], A
-	ld [HLI], A
-	ld [HLI], A
-	ld [HLI], A
-	ld [HLI], A
-	ld [HLI], A
-	ld [HLI], A
-	ld [HLI], A
+.wait:	ld a, [$FF53]
+	and $02
+	jr z, .nodata
+	ld a, [$FF52]
+	ld [$FF51], a
 	
-	ld A, $FF
-	ld [HLI], A
-	ld [HLI], A
-	ld [HLI], A
-	ld [HLI], A
-	ld [HLI], A
-	ld [HLI], A
-	ld [HLI], A
-	ld [HLI], A
-	
-	ld c, $51
-	
-.wait:	ld a, [c]
+	cp $1B		; Escape
+	jp z, .cbc
+	ld [$FF52], a
+.cbc:	call z, bootcmd
+
+.nodata:	ld a, [$FF51]
 	cp $00
 	jr nz, .wait
 
+doboot:	xor a
 	ld h, a
 	ld l, a
 	ld [hl], $01	; Select the GB boot rom
@@ -47,12 +35,17 @@ boot:	ld a, $AA
 	
 	rst $00		; Boot
 
+signon:
+	db $0D,$0A,$1B,"[1mFPGABoy Boot ROM",$1B,"[0m",$0D,$0A,0
+booting:
+	db "Booting...",$0D,$0A,0
+
 putc:
 	ld c, $53
 	push af
 .waitport:
 	ld a,[c]
-	cp $00
+	and $01
 	jr nz,.waitport
 	pop af
 	ld [$FF52],a
@@ -65,12 +58,61 @@ puts:
 	call putc
 	jr puts
 
-signon:
-	db $0D,$0A,$1B,"[1mFPGABoy Boot ROM",$1B,"[0m",$0D,$0A,0
-booting:
-	db "Booting...",$0D,$0A,0
-
+getc:
+	ld a, [$FF53]
+	and $02
+	jr z, getc
+	ld a, [$FF52]
+	ret
 
+bootcmd:
+	call getc
+	cp $56	;V
+	jr z,.version
+	cp $41	;A
+	jr z,.addr
+	cp $44	;D
+	jr z,.data
+	cp $50	;P
+	jr z,.prog
+	cp $42	;B
+	jr z,doboot
+	cp $1B
+	jr z,bootcmd	; If you keep yelling, you're bound to get the thing's attention.
+	ld a, $3f	;?
+	jr putc
+.version:
+	ld hl, .verstr
+	jr puts
+.verstr:
+	db "V1.00",0
+.addr:
+	call getc
+	ld [$FF60], A
+	call getc
+	ld [$FF61], A
+	call getc
+	ld [$FF62], A
+	ld A, $41	;A
+	jr putc
+.data:
+	call getc	; byte count
+	ld c, a
+.dl:	call getc
+	ld [$FF63], A
+	dec c
+	jp nz, .dl
+	ld A, $44	;D
+	ret
+.prog:
+	ld hl, $FF80
+	ld c, $7F
+.pl:	dec c
+	jp z, $FF80
+	call getc
+	ld [hli], a
+	jr .pl
+	
 	SECTION "a", HOME[$100]
 	nop	; Make sure we don't overflow.
 	
\ No newline at end of file