MS Teams channels cannot contain MS-DOS device names

Re:MS Teams channels cannot contain MS-DOS device names by zaxomi on Thursday August 10, 2023 @12:06PM (#37077957)

MSDOS 3.3 had COM1, COM2, COM3, COM4, LPT1, LPT2, and LPT3. LPT4-9 and COM5-9 was not part of MSDOS.

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Re:MS Teams channels cannot contain MS-DOS device names by olyjohn on Thursday August 10, 2023 @06:03PM (#37082359)

IIRC those were mapped to specific I/O and IRQ Ports back in the day.

  COM1: I/O port 0x3F8, IRQ 4
  COM2: I/O port 0x2F8, IRQ 3
  COM3: I/O port 0x3E8, IRQ 4
  COM4: I/O port 0x2E8, IRQ 3

I also remember, there was a while where there was no IRQ sharing. So some machines couldn't use all the COM ports available. Or you'd add in like a modem, and would have to disable the onboard COM port if it was using the same IRQ.

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