On 5/28/24 17:02, ben via cctalk wrote: > On 2024-05-28 5:45 p.m., Chuck Guzis via cctalk wrote: >> On 5/28/24 16:29, ben via cctalk wrote: >>> On 2024-05-28 1:23 p.m., John via cctalk wrote: >>> >>>> So what, then, consitutes a Real Operating System, and why? >>> >>> I am grumpy about OS's like MSDOS, in that programs kept by passing >>> DOS to handle screen, and serial IO. >>> I also favor OS's that don't require one to build a file control block. >> >> Do you mean like MSDOS (later functions use file handles, not FCBs)? >> Been like that since about DOS 2.0... >> >> --Chuck >> > True, but serial IO was never fixed to my knowledge to use interrupts.
There were several device drivers that hooked the BIOS interrupt and used interrupt servicing. Lots of comm programs simply internalized the serial i/O driver code, just like the screen display code. No big deal --Chuck
