4 ld c, $51 ; Note that we are alive.
14 ld a, $04 ;start timer, 4.096KHz
27 section "fuq",HOME[$100]
34 ld c, $0F ; ack the irq
45 db $0D,$0A,$1B,"[1mFPGABoy Diagnostic ROM",$1B,"[0m",$0D,$0A,0
47 ; Memory tester: writes h ^ l to all addresses from C000 to DF80.
52 ld hl, $C000 ; Write loop
64 ld hl, $C000 ; Read loop
80 ld hl, testokstr ; Say we're OK
83 .memfail: ; Say we failed (sadface)
84 ; decrement hl the easy way
100 db "Testing memory from $C000 to $DF80...",0
104 db " Test failed at $",0
106 puthex: ; Put two hex nibbles to the serial console.
125 ; Wait for switches to be flipped on and off again.
146 db "Diagnostic ROM complete; flip switches to nonzero and then to zero to reset. Expect A.",$0D,$0A,0
148 ; Core instruction basic acceptance tests.
233 db "Testing instructions... ",0
251 db " test failed.",$0D,$0A,0
255 ; Serial port manipulation functions.