MIKBUG

MIKBUG

MIKBUG

ROM monitor from Motorola

MIKBUG is a ROM monitor from Motorola for the Motorola 6800 8-bit microprocessor. It is intended to "be used to debug and evaluate a user's program".[1]

MIKBUG was part of the extensive M6800 microcomputer support developed by Motorola's Application Engineering Group.

MIKBUG was distributed by Motorola in 1974[2] on a 1 K ROM chip part number MCM6830L7. It occupied 512 bytes on the chip, where the remainder was occupied by a 256 byte MINIBUG monitor—a stripped-down version of MIKBUG—and a 256 byte "test pattern" (really just a different and unused revision of MINIBUG). It requires 128 bytes of random-access memory for operation. Its functionality was similar to other monitors of the early microcomputer era, such as the Intel MON-80 for the Intel 8080.

MIKBUG is initiated when power is first applied to the system, or when the system RESET button is pressed. It assumes the presence of a terminal that the user will use to issue commands.

List of commands and functions

More information Command, Function ...

Callable functions include input and output of a character on the terminal, input and output of a byte in hexadecimal format, print a string terminated by EOT, and terminate the current program and return control to MIKBUG.[2]

MIKBUG allows the user to install an interrupt handler using the M command to specify the handler address.

Listings of MIKBUG and MINIBUG monitors are available online.[1]

References

  1. [1]
    Wiles, Mike; Felix, Andre (1973). Engineering Note 100 – MCM6830L7 MIKBUG/MINIBUG ROM (PDF). Motorola Semiconductor Products Inc. Archived (PDF) from the original on 2022-08-19. Retrieved 2022-07-11. (24 pages)
  2. [2]
    Rathkey, John (February 1977). "A MIKBUG Roadmap..." BYTE. Vol. 2, no. 2. Peterborough, New Hampshire, USA: BYTE Publications Inc. pp. 96–99. Retrieved 2022-07-11.
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