M520+ BIOS list from Original list and More 2012/12/27 by CW Cyrix/Ami Sapphire Last Updated: 2013/07/14 M520 Mainboard can use this BIOS file: 5200601l.bin checksum: * 80FB * BIOS Date:06/01/1996. FOR PnP (for Block size=16K flash ROM, e.g. MX 28F1000PL) Board Description:Intel PCIset SB82437VX,SB82371SB and SB82438VX BIOS Features:To support IDE LBA mode(>512MB),IDE block mode,AUTO banking DRAM size and addition CYRIX CPU title. 5200601s.bin checksum: * 123F * BIOS Date:06/01/1996. FOR PnP (for Block size=4K flash ROM, e.g. intel P28F001BXT, SST PH29EE010, Winbond W29EE011 ) Board Description:Intel PCIset SB82437VX,SB82371SB and SB82438VX BIOS Features:To support IDE LBA mode(>512MB),IDE block mode,AUTO banking DRAM size and addition CYRIX CPU title. M520, M525 Mainboard can use this BIOS file: 5200702l.bin checksum: * 15F3 * BIOS Date:07/02/1996. FOR M525 & M520 PnP (for Block size=16K flash ROM, e.g. MX 28F1000PL) Board Description:Intel PCIset SB82437VX,SB82371SB and SB82438VX BIOS Features:To support IDE LBA mode(>512MB),IDE block mode,AUTO banking DRAM size and addition CYRIX CPU title. 5200702s.bin checksum: * DF56 * BIOS Date:07/02/1996. FOR M525 & M520 PnP (for Block size=4K flash ROM, e.g. intel P28F001BXT, SST PH29EE010, Winbond W29EE011 ) Board Description:Intel PCIset SB82437VX,SB82371SB and SB82438VX BIOS Features:To support IDE LBA mode(>512MB),IDE block mode,AUTO banking DRAM size and addition CYRIX CPU title. 5200831l.bin checksum: * 8122 * BIOS Date:08/31/1996 L. FOR M525 & M520 PnP (for Block size=16K flash ROM, e.g. MX 28F1000PL) Board Description:Intel PCIset SB82437VX,SB82371SB and SB82438VX BIOS Features:To support IDE LBA mode(>512MB),IDE block mode,AUTO banking DRAM size and addition CYRIX CPU title. 5200831s.bin checksum: * 5A18 * BIOS Date:08/31/1996 S. FOR M525 & M520 PnP (for Block size=4K flash ROM, e.g. intel P28F001BXT, SST PH29EE010, Winbond W29EE011 ) Board Description:Intel PCIset SB82437VX,SB82371SB and SB82438VX BIOS Features:To support IDE LBA mode(>512MB),IDE block mode,AUTO banking DRAM size and addition CYRIX CPU title. M520, M525, M530 Mainboard can use this BIOS file: 5301020l.bin checksum: * 0708 * BIOS Date:10/20/1996 L. FOR M530 & M525 & M520 PnP (for Block size=16K flash ROM, e.g. MX 28F1000PL) Board Description:Intel PCIset SB82437VX,SB82371SB and SB82438VX BIOS Features:To support IDE LBA mode(>512MB),IDE block mode,AUTO banking DRAM size and addition CYRIX CPU title. 5301020s.bin checksum: * A753 * BIOS Date:10/20/1996 S. FOR M530 & M525 & M520 PnP (for Block size=4K flash ROM, e.g. intel P28F001BXT, SST PH29EE010, Winbond W29EE011 ) Board Description:Intel PCIset SB82437VX,SB82371SB and SB82438VX BIOS Features:To support IDE LBA mode(>512MB),IDE block mode,AUTO banking DRAM size and addition CYRIX CPU title. M520, M525, M530, M535, M538, Mainboard can use this BIOS file: 5300303l.bin checksum: * 6D6E * BIOS Date:03/03/1997 L. FOR M538 & M535 & M530 & M525 & M520 PnP (for Block size=16K flash ROM, e.g. MX 28F1000PL) Board Description:Intel PCIset SB82437VX,SB82371SB and SB82438VX BIOS Features:To support AMD K5 PR166 & K6, Cyrix M2 CPU, IDE LBA mode(>512MB),IDE block mode,AUTO banking DRAM size and addition CYRIX CPU title. 5300303s.bin checksum: * 8835 * BIOS Date:03/03/1997 S. FOR M538 & M535 & M530 & M525 & M520 PnP (for Block size=4K flash ROM, e.g. intel P28F001BXT, SST PH29EE010, Winbond W29EE011 ) Board Description:Intel PCIset SB82437VX,SB82371SB and SB82438VX BIOS Features:To support AMD K5 PR166 & K6, Cyrix M2 CPU, IDE LBA mode(>512MB),IDE block mode,AUTO banking DRAM size and addition CYRIX CPU title. M520, M525, M530, M535, M538, M549 Mainboard can use this BIOS file: 5300916l.bin checksum: * 8192 * BIOS Date:09/16/1997 L. FOR M549 & M538 & M535 & M530 & M525 & M520 PnP (for Block size=16K flash ROM, e.g. MX 28F1000PL) Board Description:Intel PCIset SB82437VX,SB82371SB and SB82438VX BIOS Features:To support IDE LBA mode(>512MB),IDE block mode,AUTO banking DRAM size and addition CYRIX CPU M2 title. 5300916s.bin checksum: * CBE5 * BIOS Date:09/16/1997 S. FOR M549 & M538 & M535 & M530 & M525 & M520 PnP (for Block size=4K flash ROM, e.g. intel P28F001BXT, SST PH29EE010, Winbond W29EE011 ) Board Description:Intel PCIset SB82437VX,SB82371SB and SB82438VX BIOS Features:To support AMD K5 PR166 & K6, Cyrix M2 CPU, IDE LBA mode(>512MB),IDE block mode,AUTO banking DRAM size and addition CYRIX CPU M2 title. Other BIOS Files: 520_Bios_19981207S_UNI [NP].zip - BIOS Date: 1998/12/07 UNI [Was previously passworded!, password was otrebla (Source: http://forums.overclockers.com.au/showthread.php?t=48623)] 530_Bios_1996-1997_0530S_AWD.zip - BIOS Date: 1996/05/30 or 1997/05/30 [cannot remember, likely 1997, will test someday] 530_Bios_19971001Sx_AWD.zip - BIOS Date: 1997/10/01 [Technically an Amptron PM8900 board BIOS; Alias PCChips M530 board... is in directory called 'extra'] 530_Bios_19971001L_AWD.zip - BIOS Date: 1997/10/01 [Technically an Amptron PM9000 board BIOS; Alias PCChips M535 board. Large block version.] 530_Bios_19971001S_AWD.zip - BIOS Date: 1997/10/01 [Technically an Amptron PM9000 board BIOS; Alias PCChips M535 board. Small block version.] 520_Bios_19971016L_AWD.zip - BIOS Date: 1997/10/16 [M549 release, Large Block version; Support for AMD K6/Cyrix M2, LS-120, booting from CD-ROM and LS-120] 520_Bios_19971016S_AWD.zip - BIOS Date: 1997/10/16 [M549 release, Small Block version; Support for AMD K6/Cyrix M2, LS-120, booting from CD-ROM and LS-120] 530_Bios_19970303L_AWD.zip - BIOS Date: 1997/03/03 [Large Block version, from Amptron PM8900 board BIOS, stuck in original list, unknown checksum] PC Chips i430VX UMC L [19971016S 64GB Patched BIOS].zip [Large Block version, filename gives away unofficial nature] PC Chips i430VX UMC S [19971016S 64GB Patched BIOS].zip [Small Block version, filename gives away unofficial nature]