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  • (Score: 2, Informative) by Anonymous Coward on Tuesday October 03 2023, @12:04PM

    by Anonymous Coward on Tuesday October 03 2023, @12:04PM (#1326921)

    It counts at least as part of an OS. I'm more familiar with the Commodore 64, but a lot of things also apply to the VIC-20. The combination of BASIC and the KERNAL certainly count as an OS. The BASIC interpreter functions as a shell, while the KERNAL contains a few math functions and a lot of I/O routines for various devices. BASIC was stored in 8K of ROM (addresses 40960-49151) and the KERNAL was in another 8K of ROM (addresses 57344-65535). If you used a disk drive, that also had its own processor, a 6502 running at 1 MHz, that ran Commodore DOS. As I recall, the drive also had 64K of address space, but it didn't have a full 64K of RAM like a Commodore 64, and the limited RAM in the drive was mirrored. In the case of the Commodore 64, the value of address 1 would determine whether the various ROMs or the underlying RAM was selected. Anyway, I'd say the combination of BASIC, the KERNAL, and the DOS running on the disk drive certainly constitutes a proper operating system. Alternative operating systems were developed as well like GEOS and LUNIX.

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