ROM:00000000 ; ROM:00000000 ; ã=========================================================================¬ ROM:00000000 ; ¦ This file is generated by The Interactive Disassembler (IDA) ¦ ROM:00000000 ; ¦ Copyright (c) 2006 by DataRescue sa/nv, ¦ ROM:00000000 ; ¦ Licensed to: Paul Ashton - Blue Lane Technologies (1-user Advanced 03/2006) ¦ ROM:00000000 ; L=========================================================================- ROM:00000000 ; ROM:00000000 ; Input MD5 : D3293EBAAA7F4EB2A6766B68A0FB4609 ROM:00000000 ROM:00000000 ; File Name : D:\Storage\EmuStuff\emu\sega\bios\Genesis_OS_ROM.bin ROM:00000000 ; Format : Binary file ROM:00000000 ; Base Address: 0000h Range: 0000h - 0800h Loaded length: 0800h ROM:00000000 ROM:00000000 ; Processor: 68000 ROM:00000000 ; Target Assembler: 680x0 Assembler in MRI compatible mode ROM:00000000 ; This file should be compiled with "as -M" ROM:00000000 ROM:00000000 ; =========================================================================== ROM:00000000 ROM:00000000 ; Segment type: Pure code ROM:00000000 ; segment "ROM" ROM:00000000 dc.l $FFFF00,start ROM:00000000 dcb.l $3E,deadloop ROM:00000100 aSegaGenesis: dc.b 'SEGA GENESIS ' ; DATA XREF: ROM:000002EEr ROM:00000100 ; ROM:000002F4r ... ROM:00000110 aCSega1990_may: dc.b '(C)SEGA 1990.MAY' ROM:00000120 aGenesisOs: dc.b 'GENESIS OS ' ROM:00000130 dc.b ' ' ROM:00000140 dc.b ' ' ROM:00000150 aGenesisOs_0: dc.b 'GENESIS OS ' ROM:00000160 dc.b ' ' ROM:00000170 dc.b ' ' ROM:00000180 aOs0000000000T: dc.b 'OS 00000000-00[t' ROM:00000190 dc.b ' ' ROM:000001A0 dc.b 0, 0, 0, 0, 0, 0, 7,$FF ROM:000001A0 dc.b 0,$FF, 0, 0, 0,$FF,$FF,$FF ROM:000001A0 dc.b $20,$20,$20,$20,$20,$20,$20,$20 ROM:000001A0 dc.b $20,$20,$20,$20,$20,$20,$20,$20 ROM:000001A0 dc.b $20,$20,$20,$20,$20,$20,$20,$20 ROM:000001A0 dc.b $20,$20,$20,$20,$20,$20,$20,$20 ROM:000001A0 dc.b $20,$20,$20,$20,$20,$20,$20,$20 ROM:000001A0 dc.b $20,$20,$20,$20,$20,$20,$20,$20 ROM:000001A0 dc.b $20,$20,$20,$20,$20,$20,$20,$20 ROM:000001A0 dc.b $20,$20,$20,$20,$20,$20,$20,$20 ROM:000001A0 dc.b $55,$20,$20,$20,$20,$20,$20,$20 ROM:000001A0 dc.b $20,$20,$20,$20,$20,$20,$20,$20 ROM:00000200 ; --------------------------------------------------------------------------- ROM:00000200 ROM:00000200 deadloop: ; CODE XREF: ROM:deadloopj ROM:00000200 ; DATA XREF: ROM:00000000o ROM:00000200 bra.s deadloop ROM:00000202 ; --------------------------------------------------------------------------- ROM:00000202 ROM:00000202 start: ; DATA XREF: ROM:00000000o ROM:00000202 lea _registers,a5 ROM:00000206 movem.l (a5)+,d5-a4 ROM:0000020A move.b $FFFFEF01(a1),d0 ROM:0000020E andi.b #$F,d0 ROM:00000212 beq.s loc_21C ROM:00000214 move.l #$53454741,$2F00(a1) ; SEGA pattern ROM:0000021C ROM:0000021C loc_21C: ; CODE XREF: ROM:00000212j ROM:0000021C move.w (a4),d0 ROM:0000021E moveq #0,d0 ROM:00000220 movea.l d0,a6 ROM:00000222 move a6,usp ROM:00000224 moveq #$17,d1 ROM:00000226 ROM:00000226 loc_226: ; CODE XREF: ROM:0000022Cj ROM:00000226 move.b (a5)+,d5 ROM:00000228 move.w d5,(a4) ROM:0000022A add.w d7,d5 ROM:0000022C dbf d1,loc_226 ROM:00000230 move.l #$40000080,(a4) ROM:00000236 move.w d0,(a3) ROM:00000238 ROM:00000238 loc_238: ; CODE XREF: ROM:0000023Ej ROM:00000238 move.w (a4),d4 ROM:0000023A btst #1,d4 ROM:0000023E bne.s loc_238 ROM:00000240 move.l #$81048F02,(a4) ROM:00000246 move.l #$C0000000,(a4) ROM:0000024C moveq #$1F,d3 ROM:0000024E ROM:0000024E loc_24E: ; CODE XREF: ROM:00000250j ROM:0000024E move.l d0,(a3) ROM:00000250 dbf d3,loc_24E ROM:00000254 move.l #$40000010,(a4) ROM:0000025A moveq #$13,d4 ROM:0000025C ROM:0000025C loc_25C: ; CODE XREF: ROM:0000025Ej ROM:0000025C move.l d0,(a3) ROM:0000025E dbf d4,loc_25C ROM:00000262 moveq #3,d5 ROM:00000264 ROM:00000264 loc_264: ; CODE XREF: ROM:00000268j ROM:00000264 move.b (a5)+,$11(a3) ROM:00000268 dbf d5,loc_264 ROM:0000026C bra.s loc_2AA ROM:0000026C ; --------------------------------------------------------------------------- ROM:0000026E _registers: dc.l $8000, $3FFF, $100, $A00000, $A11100 ROM:0000026E ; DATA XREF: ROM:starto ROM:0000026E dc.l $A11200, $C00000, $C00004, $414303C, $76C0000 ROM:0000026E dc.l $FF00,$81370001, $10000FF,$FF000080,$9FBFDFFF ROM:000002AA ; --------------------------------------------------------------------------- ROM:000002AA ROM:000002AA loc_2AA: ; CODE XREF: ROM:0000026Cj ROM:000002AA lea ($FFFFC000).w,a0 ROM:000002AE lea _code,a1 ROM:000002B2 movem.l (a1)+,d4-d7/a2-a6 ROM:000002B6 move.w #$3F,d0 ; '?' ROM:000002BA ROM:000002BA loc_2BA: ; CODE XREF: ROM:000002BCj ROM:000002BA move.w (a1)+,(a0)+ ROM:000002BC dbf d0,loc_2BA ROM:000002C0 jsr $FFFFC000 ROM:000002C4 ROM:000002C4 loc_2C4: ; CODE XREF: ROM:loc_2C4j ROM:000002C4 bra.s loc_2C4 ROM:000002C4 ; --------------------------------------------------------------------------- ROM:000002C6 _code: dc.b $20,$53,$45,$47,$45,$94, 0, 3 ; DATA XREF: ROM:000002AEo ROM:000002C6 dc.b 0, 0, 0,$F7,$53,$45,$47,$41 ROM:000002C6 dc.b 0,$A1,$40, 0, 0,$A1,$41, 1 ROM:000002C6 dc.b 0,$C0, 0, 4, 0,$C0, 0, 0 ROM:000002C6 dc.b 0,$A1, 0, 1, 8,$D3, 0, 0 ROM:000002EE ; --------------------------------------------------------------------------- ROM:000002EE cmp.l (aSegaGenesis).w,d7 ; "SEGA GENESIS " ROM:000002F2 beq.s loc_316 ROM:000002F4 cmp.l (aSegaGenesis).w,d4 ; "SEGA GENESIS " ROM:000002F8 bne.s loc_302 ROM:000002FA cmpi.b #$41,(aSegaGenesis+4).w ; 'A' ROM:00000300 beq.s loc_316 ROM:00000302 ROM:00000302 loc_302: ; CODE XREF: ROM:000002F8j ROM:00000302 bclr #0,(a3) ROM:00000306 move.b (a6),d0 ROM:00000308 andi.b #$F,d0 ROM:0000030C beq.s locret_314 ROM:0000030E move.l #0,(a2) ROM:00000314 ROM:00000314 locret_314: ; CODE XREF: ROM:0000030Cj ROM:00000314 rts ROM:00000316 ; --------------------------------------------------------------------------- ROM:00000316 ROM:00000316 loc_316: ; CODE XREF: ROM:000002F2j ROM:00000316 ; ROM:00000300j ROM:00000316 bclr #0,(a3) ROM:0000031A jsr (sub_78C).l ROM:00000320 move.l #$4C200000,(a4) ROM:00000326 ROM:00000326 loc_326: ; CODE XREF: ROM:00000328j ROM:00000326 move.l (a1)+,(a5) ROM:00000328 dbf d6,loc_326 ROM:0000032C jsr (sub_79C).l ROM:00000332 move.w #$8144,(a4) ROM:00000336 move.w #$3C,d0 ; '<' ROM:0000033A bsr.s sub_35C ROM:0000033C move.w #$8104,(a4) ROM:00000340 move.b (a6),d0 ROM:00000342 andi.b #$F,d0 ROM:00000346 beq.s loc_34E ROM:00000348 move.l #0,(a2) ROM:0000034E ROM:0000034E loc_34E: ; CODE XREF: ROM:00000346j ROM:0000034E bset #0,(a3) ROM:00000352 moveq #0,d0 ROM:00000354 movea.l d0,a0 ROM:00000356 movea.l (a0)+,sp ROM:00000358 movea.l (a0)+,a0 ROM:0000035A jmp (a0) ROM:0000035C ROM:0000035C ; --------------- S U B R O U T I N E --------------------------------------- ROM:0000035C ROM:0000035C ROM:0000035C sub_35C: ; CODE XREF: ROM:0000033Ap ROM:0000035C ; sub_35C+8j ROM:0000035C move.w #$95CE,d1 ROM:00000360 ROM:00000360 loc_360: ; CODE XREF: sub_35C:loc_360j ROM:00000360 dbf d1,loc_360 ROM:00000364 dbf d0,sub_35C ROM:00000368 rts ROM:00000368 ; End of function sub_35C ROM:00000368 ROM:00000368 ; --------------------------------------------------------------------------- ROM:0000036A dc.b 0, 1, $E,$EE, $E,$E8, 1,$11,$11, 0,$11, 0, 1,$10,$11, 0 ROM:0000036A dc.b 1,$10,$11, 0, 1,$10,$11,$11,$11,$10,$11, 0, 1,$10,$11, 0 ROM:0000036A dc.b 1,$10, 0, 0, 0, 0,$11,$11,$11, 0,$11, 0, 1,$10,$11, 0 ROM:0000036A dc.b 1,$10,$11,$11,$11, 0,$11, 0, 1,$10,$11, 0, 1,$10,$11,$11 ROM:0000036A dc.b $11, 0, 0, 0, 0, 0,$11,$11,$11,$10,$11, 0, 1,$10,$11, 0 ROM:0000036A dc.b 1,$10,$11, 0, 0, 0,$11, 0, 1,$10,$11, 0, 1,$10,$11,$11 ROM:0000036A dc.b $11,$10, 0, 0, 0, 0,$11,$11,$11, 0,$11, 0, 1,$10,$11, 0 ROM:0000036A dc.b 1,$10,$11, 0, 1,$10,$11, 0, 1,$10,$11, 0, 1,$10,$11,$11 ROM:0000036A dc.b $11, 0, 0, 0, 0, 0,$11,$11,$11,$10,$11, 0, 0, 0,$11, 0 ROM:0000036A dc.b 0, 0,$11,$11,$11, 0,$11, 0, 0, 0,$11, 0, 0, 0,$11,$11 ROM:0000036A dc.b $11,$10, 0, 0, 0, 0,$11,$11,$11,$10,$11, 0, 0, 0,$11, 0 ROM:0000036A dc.b 0, 0,$11,$11,$11, 0,$11, 0, 0, 0,$11, 0, 0, 0,$11, 0 ROM:0000036A dc.b 0, 0, 0, 0, 0, 0,$11,$11,$11,$10,$11, 0, 1,$10,$11, 0 ROM:0000036A dc.b 0, 0,$11, 0,$11,$10,$11, 0, 1,$10,$11, 0, 1,$10,$11,$11 ROM:0000036A dc.b $11,$10, 0, 0, 0, 0,$11, 0, 1,$10,$11, 0, 1,$10,$11, 0 ROM:0000036A dc.b 1,$10,$11,$11,$11,$10,$11, 0, 1,$10,$11, 0, 1,$10,$11, 0 ROM:0000036A dc.b 1,$10, 0, 0, 0, 0, 0,$11,$10, 0, 0,$11,$10, 0, 0,$11 ROM:0000036A dc.b $10, 0, 0,$11,$10, 0, 0,$11,$10, 0, 0,$11,$10, 0, 0,$11 ROM:0000036A dc.b $10, 0, 0, 0, 0, 0, 0, 0, 1,$10, 0, 0, 1,$10, 0, 0 ROM:0000036A dc.b 1,$10, 0, 0, 1,$10, 0, 0, 1,$10, 1,$10, 1,$10, 1,$11 ROM:0000036A dc.b $11,$10, 0, 0, 0, 0,$11, 0, 1,$10,$11, 0,$11, 0,$11,$11 ROM:0000036A dc.b $10, 0,$11,$11,$10, 0,$11, 0,$11, 0,$11, 0, 1,$10,$11, 0 ROM:0000036A dc.b 1,$10, 0, 0, 0, 0, 1,$10, 0, 0, 1,$10, 0, 0, 1,$10 ROM:0000036A dc.b 0, 0, 1,$10, 0, 0, 1,$10, 0, 0, 1,$10, 0, 0, 1,$11 ROM:0000036A dc.b $11,$10, 0, 0, 0, 0,$11, 0, 1,$10,$11,$10,$11,$10,$11,$11 ROM:0000036A dc.b $11,$10,$11, 1, 1,$10,$11, 0, 1,$10,$11, 0, 1,$10,$11, 0 ROM:0000036A dc.b 1,$10, 0, 0, 0, 0,$11, 0, 1,$10,$11,$10, 1,$10,$11,$11 ROM:0000036A dc.b 1,$10,$11, 1,$11,$10,$11, 0,$11,$10,$11, 0, 1,$10,$11, 0 ROM:0000036A dc.b 1,$10, 0, 0, 0, 0,$11,$11,$11,$10,$11, 0, 1,$10,$11, 0 ROM:0000036A dc.b 1,$10,$11, 0, 1,$10,$11, 0, 1,$10,$11, 0, 1,$10,$11,$11 ROM:0000036A dc.b $11,$10, 0, 0, 0, 0,$11,$11,$11,$10,$11, 0, 1,$10,$11, 0 ROM:0000036A dc.b 1,$10,$11,$11,$11,$10,$11, 0, 0, 0,$11, 0, 0, 0,$11, 0 ROM:0000036A dc.b 0, 0, 0, 0, 0, 0,$11,$11,$11,$10,$11, 0, 1,$10,$11, 0 ROM:0000036A dc.b 1,$10,$11, 0, 1,$10,$11, 0,$11,$10,$11, 0,$11,$10,$11,$11 ROM:0000036A dc.b $11,$10, 0, 0, 0, 0,$11,$11,$11,$10,$11, 0, 1,$10,$11, 0 ROM:0000036A dc.b 1,$10,$11,$11,$11, 0,$11, 0, 1,$10,$11, 0, 1,$10,$11, 0 ROM:0000036A dc.b 1,$10, 0, 0, 0, 0,$11,$11,$11,$10,$11, 0, 1,$10,$11, 0 ROM:0000036A dc.b 0, 0,$11,$11,$11,$10, 0, 0, 1,$10,$11, 0, 1,$10,$11,$11 ROM:0000036A dc.b $11,$10, 0, 0, 0, 0,$11,$11,$11,$10, 0,$11,$10, 0, 0,$11 ROM:0000036A dc.b $10, 0, 0,$11,$10, 0, 0,$11,$10, 0, 0,$11,$10, 0, 0,$11 ROM:0000036A dc.b $10, 0, 0, 0, 0, 0,$11, 0, 1,$10,$11, 0, 1,$10,$11, 0 ROM:0000036A dc.b 1,$10,$11, 0, 1,$10,$11, 0, 1,$10,$11, 0, 1,$10,$11,$11 ROM:0000036A dc.b $11,$10, 0, 0, 0, 0,$11, 0, 1,$10,$11, 0, 1,$10,$11, 0 ROM:0000036A dc.b 1,$10,$11, 0, 1,$10, 1,$10,$11, 0, 0,$11,$10, 0, 0, 1 ROM:0000036A dc.b 0, 0, 0, 0, 0, 0,$11, 0, 1,$10,$11, 0, 1,$10,$11, 0 ROM:0000036A dc.b 1,$10,$11, 1, 1,$10,$11,$11,$11,$10,$11,$10,$11,$10,$11, 0 ROM:0000036A dc.b 1,$10, 0, 0, 0, 0,$11, 0, 1,$10,$11, 0, 1,$10,$11,$10 ROM:0000036A dc.b $11,$10, 1,$11,$11, 0,$11,$10,$11,$10,$11, 0, 1,$10,$11, 0 ROM:0000036A dc.b 1,$10, 0, 0, 0, 0,$11, 0, 1,$10,$11, 0, 1,$10,$11, 0 ROM:0000036A dc.b 1,$10, 1,$10,$11, 0, 0,$11,$10, 0, 0,$11,$10, 0, 0,$11 ROM:0000036A dc.b $10, 0, 0, 0, 0, 0,$11,$11,$11,$10, 0, 0,$11,$10, 0, 1 ROM:0000036A dc.b $11, 0, 0,$11,$10, 0, 1,$11, 0, 0,$11,$10, 0, 0,$11,$11 ROM:0000036A dc.b $11,$10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ROM:0000036A dc.b 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1,$10, 0, 0, 1,$10 ROM:0000036A dc.b 0, 0, 0, 0, 0, 0, 2,$22,$22, 0,$22, 0, 2,$20,$22, 0 ROM:0000036A dc.b 0, 0, 2,$22,$22, 0, 0, 0, 2,$20,$22, 0, 2,$20, 2,$22 ROM:0000036A dc.b $22, 0, 0, 0, 0, 0, 2,$22,$22,$20,$22, 0, 0, 0,$22, 0 ROM:0000036A dc.b 0, 0,$22,$22,$22, 0,$22, 0, 0, 0,$22, 0, 0, 0, 2,$22 ROM:0000036A dc.b $22,$20, 0, 0, 0, 0, 2,$22,$22, 0,$22, 0, 2,$20,$22, 0 ROM:0000036A dc.b 0, 0,$22, 0,$22,$20,$22, 0, 2,$20,$22, 0, 2,$20, 2,$22 ROM:0000036A dc.b $22,$20, 0, 0, 0, 0, 0, 2,$20, 0, 0,$22,$22, 0, 0,$22 ROM:0000036A dc.b $22, 0, 2,$20, 2,$20, 2,$20, 2,$20,$22, 0, 0,$22,$22, 2 ROM:0000036A dc.b $22,$22, 0, 0, 0, 0 ROM:00000750 aProducedByOr: dc.b ' produced by or' ROM:00000761 dc.b $FF ROM:00000762 aUnderLicenseFr:dc.b ' under license from' ROM:00000775 dc.b $FF ROM:00000776 aSegaEnterprise:dc.b 'sega,enterprises ltd{',0 ROM:0000078C ROM:0000078C ; --------------- S U B R O U T I N E --------------------------------------- ROM:0000078C ROM:0000078C ROM:0000078C sub_78C: ; CODE XREF: ROM:0000031Ap ROM:0000078C move.w (a1)+,d0 ROM:0000078E move.l #$C0020000,(a4) ROM:00000794 ROM:00000794 loc_794: ; CODE XREF: sub_78C+Aj ROM:00000794 move.w (a1)+,(a5) ROM:00000796 dbf d0,loc_794 ROM:0000079A rts ROM:0000079A ; End of function sub_78C ROM:0000079A ROM:0000079C ROM:0000079C ; --------------- S U B R O U T I N E --------------------------------------- ROM:0000079C ROM:0000079C ROM:0000079C sub_79C: ; CODE XREF: ROM:0000032Cp ROM:0000079C ; sub_79C+16j ROM:0000079C move.l d5,(a4) ROM:0000079E ROM:0000079E loc_79E: ; CODE XREF: sub_79C+Ej ROM:0000079E moveq #0,d1 ROM:000007A0 move.b (a1)+,d1 ROM:000007A2 bmi.s loc_7AC ROM:000007A4 bne.s loc_7A8 ROM:000007A6 rts ROM:000007A8 ; --------------------------------------------------------------------------- ROM:000007A8 ROM:000007A8 loc_7A8: ; CODE XREF: sub_79C+8j ROM:000007A8 move.w d1,(a5) ROM:000007AA bra.s loc_79E ROM:000007AC ; --------------------------------------------------------------------------- ROM:000007AC ROM:000007AC loc_7AC: ; CODE XREF: sub_79C+6j ROM:000007AC addi.l #$1000000,d5 ROM:000007B2 bra.s sub_79C ROM:000007B2 ; End of function sub_79C ROM:000007B2 ROM:000007B2 ; --------------------------------------------------------------------------- ROM:000007B4 dcb.b $4C,$FF ROM:000007B4 ; end of 'ROM' ROM:000007B4 ROM:000007B4 ROM:000007B4 END