That BIOS will take over control during POST. It’s made for XT class system and thus has its own HDD BIOS in the form of an Option-ROM. – The exception to this is an 8-bit “ISA” HDD controller, maybe. All it sees is a WD1003 or compatible HDD system. In fact, it does not even differenciate between those to. That’s why an old AT-BIOS from the mid-80s can talk to both MFM/RLL fixed-disk drives (like ST506) and IDE. They had a translation board installed.Īnyway, both ST412/ST506 controllers and IDE HDDs (aka AT-Bus HDDs previously) talk the same controller language (WD1003). Some late 80s SCSI drives were ESDI based, I believe. IDE is like simplye subset of AT-Bus/ISA.) Unlike IDE, which had its controller on the drive (an ISA IDE “controller” really is a simple host adapter, a businterface. The drive has a bit of electronics, but still needs a dedicated HDD controller to function. There’s also a ESDI, an in between of ST412/ST506 and IDE. Posted in Retrocomputing Tagged 486, command line, communications, dos, hard drive, image, recovery, retro, serial, windows xp Post navigation While it might sound uncommon, computers of this vintage are still around running things like CNC machines or old mainframes. wrote up a piece of software for both the receiving computer and the sending computer in order to copy the drive sectors one by one across a serial link to a standalone computer running Windows XP, and was able to recover the contents of the drive that way instead.Īll of the code wrote is available on his GitHub page for anyone looking to boot up a 30-year-old computer again. He calls it the “lunchbox” computer due to its form factor, and while it doesn’t have USB it does have a tried-and-trusted serial port to communicate with other computers. recently came across a 80486 with this problem, so he had to get creative to recover the contents of the drive. Plenty of competing standards, including USB, existed in the computing world in the decades before it came to dominance, and if you’re trying to recover data from a computer without USB you might have to get creative with how it’s done. Universal Serial Bus has been the de facto standard for sending information to and from computer peripherals for almost two decades, but despite the word “universal” in the name this wasn’t always the case.
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