Digital Research wrote in the CP/M manual that
"The BIOS and BDOS are logically combined into a single module with a common entry point and referred to as the FDOS. "
What is FDOS an abbreviation for?
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5according to wikipedia: "FDOS may refer to: Floppy Disk Operating System, a term sometimes used to describe early floppy-based disk operating systems such as CP/M"– Tommylee2kJan 16 at 16:21
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@Tommylee2k, I don't think it's that. From the CP/M documentation, FDOS refers to the combined BIOS and BDOS, as the question says. That Wikipedia definition sounds more like a backronym to me.– TonyMJan 16 at 23:03
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1 Answer
I recall seeing it expanded to Full Disk Operating System (since a BIOS+BDOS together are sufficient to run CP/M programs).
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1@john_e I assumed "full disk operative system" before I asked here. But since I know CP/M changed meaning from "monitor" to "microprocessor" (and I like to understand things evolutionarily) I asked anyway. I think it's possible Kildall changed the meaining of the term "FDOS" too. That it might have started to mean "Full Disk Operative System" or possibly "Flexible Disk Operative System" after he added BIOS component (and lumped the BDOS with it), but that the term was also around before that and meant "Floppy Disk Operative System". Jan 19 at 7:26
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1The term "Floppy Disk Operative System" was mentioned in 1976, referring to CP/M, Warren, Jim (April 1976). "First word on a floppy-disk operating system". Dr. Dobb's Journal. And, IMSAI used the term too, bitsavers.org/pdf/imsai/dos-a/…, and I think they were first to popularize CP/M. And, "FDOS" appears in 1975 source code from Kildall, cpm.z80.de/source.html. Jan 19 at 7:28
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user3840170 The first half sure, the two references to "Floppy Disk Operating System". But I'm more interested in what john_e wrote, because that is what I assumed myself, and I have little on that, only thing I could add is the wild guess that Gary could have changed the meaning of FDOS like he did with CP/M. Jan 21 at 7:26