X-Git-Url: http://git.joshuawise.com/fpgaboy.git/blobdiff_plain/49c326da841985a8aa48e8544173e5c045c6e0eb..1eefdc8e89a69963b1c1a084fe4ecec844997293:/fpgaboot.asm

diff --git a/fpgaboot.asm b/fpgaboot.asm
index a923657..4a1089f 100644
--- a/fpgaboot.asm
+++ b/fpgaboot.asm
@@ -1,11 +1,15 @@
 	SECTION "boot", HOME[$0]
-	ld a, $AA
+boot:	ld a, $AA
 	ld [$FF51], A	; Poke the LEDs
+
+	ld sp, $FFFE
+	
+	ld hl, signon
+	call puts
 	
 	; Write a little bit to the RAM
-	ld H, $01
-	ld L, $00
-	ld A, $00
+	ld hl, $0104
+	xor a
 	ld [HLI], A
 	ld [HLI], A
 	ld [HLI], A
@@ -15,9 +19,6 @@
 	ld [HLI], A
 	ld [HLI], A
 	
-	ld a, $55
-	ld [$FF51], A	; Poke the LEDs
-	
 	ld A, $FF
 	ld [HLI], A
 	ld [HLI], A
@@ -28,11 +29,48 @@
 	ld [HLI], A
 	ld [HLI], A
 	
-	ld H, $00
-	ld L, $00
-	ld [HL], $01	; Select the GB boot rom
-	rst $00		; Boot
+	ld c, $51
 	
+.wait:	ld a, [c]
+	cp $00
+	jr nz, .wait
+
+	ld h, a
+	ld l, a
+	ld [hl], $01	; Select the GB boot rom
+	
+	ld a, $55
+	ld [c], a
+	
+	ld hl, booting
+	call puts
+	
+	rst $00		; Boot
+
+putc:
+	ld c, $53
+	push af
+.waitport:
+	ld a,[c]
+	cp $00
+	jr nz,.waitport
+	pop af
+	ld [$FF52],a
+	ret
+
+puts:
+	ld a, [hli]
+	cp $00
+	ret z
+	call putc
+	jr puts
+
+signon:
+	db $0D,$0A,$1B,"[1mFPGABoy Boot ROM",$1B,"[0m",$0D,$0A,0
+booting:
+	db "Booting...",$0D,$0A,0
+
+
 	SECTION "a", HOME[$100]
 	nop	; Make sure we don't overflow.
 	
\ No newline at end of file