X-Git-Url: http://git.joshuawise.com/fpgaboy.git/blobdiff_plain/dadf7990cbca24581bbb3c036df717dd59bdea41..318331120b0bd48a06902e70a63b4f536a85de5f:/rom.asm

diff --git a/rom.asm b/rom.asm
index 2e98e13..437f01e 100644
--- a/rom.asm
+++ b/rom.asm
@@ -4,20 +4,43 @@ main:
 	ld c, $51	; Note that we are alive.
 	ld a, $FF
 	ld [c],a
-
+	
 	ld sp, $DFFF
 
 	ld hl, signon
 	call puts
+
+	ld c, $07
+	ld a, $04	;start timer, 4.096KHz
+	ld [c], a
+	ei
 	
 	call memtest
 
 	call insntest
 
 	call waitsw
+	di
 
 	jr main
 
+	section "fuq",HOME[$100]
+irqhand:
+	PUSH AF
+	PUSH BC
+	PUSH DE
+	PUSH HL
+	xor a
+	ld c, $0F	; ack the irq
+	ld [c], a
+	ld a, $41	; print A
+	call putc
+	POP HL
+	POP DE
+	POP BC
+	POP AF
+	RETI
+
 signon:
 	db $0D,$0A,$1B,"[1mFPGABoy Diagnostic ROM",$1B,"[0m",$0D,$0A,0
 
@@ -103,12 +126,11 @@ puthex:				; Put two hex nibbles to the serial console.
 waitsw:
 	ld hl,waitswstr
 	call puts
-	
+
 	ld c, $51
-	ld a, $00
+	xor a
 	ld [c],a
 	
-	ld c, $51
 	ld b, $0
 .loop1:
 	ld a,[c]
@@ -121,7 +143,7 @@ waitsw:
 	ret
 
 waitswstr:
-	db "Diagnostic ROM complete; flip switches to nonzero and then to zero to reset.",$0D,$0A,0
+	db "Diagnostic ROM complete; flip switches to nonzero and then to zero to reset. Expect A.",$0D,$0A,0
 
 ; Core instruction basic acceptance tests.
 insntest:
@@ -232,9 +254,9 @@ insntest:
 
 ; Serial port manipulation functions.
 putc:
-	push af
 	ld b, 0
 	ld c, $50
+	push af
 .waitport:
 	ld a,[c]
 	cp b
@@ -247,6 +269,8 @@ puts:
 	ld a, [hli]
 	ld b, $00
 	cp b
-	ret z
+	jr z, .done
 	call putc
 	jr puts
+.done:
+	ret