000200d4 - 000201b0

000200d4: 3c038003 lui r3,0x8003
000200d8: 8c631b40 lw r3,0x1b40(r3)
000200dc: 34020001 ori r2,r0,0x0001
000200e0: a0620000 sb r2,0x0000(r3)                    # index CDROM I/O port 1
000200e4: 3c028003 lui r2,0x8003
000200e8: 8c421b4c lw r2,0x1b4c(r2)                 
000200ec: 00000000 nop 
000200f0: 90420000 lbu r2,0x0000(r2)                   # read interrupt flag register
000200f4: 00000000 nop
000200f8: 30420007 andi r2,r2,0x0007
000200fc: 10400016 beq r2,r0,0x00020158                # branch if response was not received
00020100: 34030007 ori r3,r0,0x0007
00020104: 34040001 ori r4,r0,0x0001
00020108: 3c028003 lui r2,0x8003
0002010c: 8c421b40 lw r2,0x1b40(r2)
00020110: 00000000 nop
00020114: a0440000 sb r4,0x0000(r2)                    # index CDROM I/O port 1 (again)
00020118: 3c028003 lui r2,0x8003
0002011c: 8c421b4c lw r2,0x1b4c(r2)
00020120: 00000000 nop
00020124: a0430000 sb r3,0x0000(r2)                    # acknowledge that response was received
00020128: 3c028003 lui r2,0x8003
0002012c: 8c421b48 lw r2,0x1b48(r2)   
00020130: 00000000 nop
00020134: a0430000 sb r3,0x0000(r2)                    # set interrupt enabling bits 0-2?
00020138: 3c028003 lui r2,0x8003
0002013c: 8c421b4c lw r2,0x1b4c(r2)
00020140: 00000000 nop
00020144: 90420000 lbu r2,0x0000(r2)
00020148: 00000000 nop
0002014c: 30420007 andi r2,r2,0x0007
00020150: 1440ffed bne r2,r0,0x00020108                # loop if interrupt response was received
00020154: 00000000 nop
00020158: 3c018003 lui r1,0x8003
0002015c: a0201b5a sb r0,0x1b5a(r1)
00020160: 3c038003 lui r3,0x8003
00020164: 90631b5a lbu r3,0x1b5a(r3)
00020168: 3c028003 lui r2,0x8003
0002016c: 24421b59 addiu r2,r2,0x1b59
00020170: a0430000 sb r3,0x0000(r2)
00020174: 3c038003 lui r3,0x8003
00020178: 8c631b40 lw r3,0x1b40(r3)
0002017c: 34020002 ori r2,r0,0x0002
00020180: 3c018003 lui r1,0x8003
00020184: a0221b58 sb r2,0x1b58(r1)
00020188: a0600000 sb r0,0x0000(r3)                    # index CDRom I/O port 0
0002018c: 3c028003 lui r2,0x8003
00020190: 8c421b4c lw r2,0x1b4c(r2)
00020194: 00000000 nop
00020198: a0400000 sb r0,0x0000(r2)                    # clear request register
0002019c: 3c038003 lui r3,0x8003
000201a0: 8c631b50 lw r3,0x1b50(r3)
000201a4: 34021325 ori r2,r0,0x1325
000201a8: ac620000 sw r2,0x0000(r3)                    # store 0x1325 to COM Delay (5 recovery period cycles, 2 hold period cycles, 3 floating release cycles, 1 strobe active-going edge delay)
000201ac: 03e00008 jr r31
000201b0: 00000000 nop