Closed BIOS 1.58 for Unisys Sperry 3137-00 Micro IT

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heALer

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Dont know if this is the right place to ask but I have a PC clone Sperry 3137-00 with bios 1.52, that version doesnt support 1.2Mb floppy discs, only 360k. Guess I cant just update the bios with software (have no bios bin file anyway), so looking for rom chip 1.58. Maybe this is the same thing as asking the sky to drop a rom chip for me but I have a go and see if someone might have any lying deep within a closet or something :)
Thank you

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