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MIKBUG is a ROM
monitor Monitor or monitor may refer to: Places * Monitor, Alberta * Monitor, Indiana, town in the United States * Monitor, Kentucky * Monitor, Oregon, unincorporated community in the United States * Monitor, Washington * Monitor, Logan County, We ...
from
Motorola Motorola, Inc. () was an American multinational telecommunications company based in Schaumburg, Illinois, United States. After having lost $4.3 billion from 2007 to 2009, the company split into two independent public companies, Motorola ...
for the
Motorola 6800 The 6800 ("''sixty-eight hundred''") is an 8-bit microprocessor designed and first manufactured by Motorola in 1974. The MC6800 microprocessor was part of the M6800 Microcomputer System (latter dubbed ''68xx'') that also included serial and para ...
8-bit microprocessor. It is intended to "be used to debug and evaluate a user's program". MIKBUG was distributed by Motorola in 1974 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 Random-access memory (RAM; ) is a form of computer memory that can be read and changed in any order, typically used to store working data and machine code. A random-access memory device allows data items to be read or written in almost th ...
for operation. Its functionality was similar to other monitors of the early microcomputer era, such as the
Intel Intel Corporation is an American multinational corporation and technology company headquartered in Santa Clara, California. It is the world's largest semiconductor chip manufacturer by revenue, and is one of the developers of the x86 seri ...
MON-80 for the
Intel 8080 The Intel 8080 (''"eighty-eighty"'') is the second 8-bit microprocessor designed and manufactured by Intel. It first appeared in April 1974 and is an extended and enhanced variant of the earlier 8008 design, although without binary compati ...
. 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 Terminal may refer to: Computing Hardware * Terminal (electronics), a device for joining electrical circuits together * Terminal (telecommunication), a device communicating over a line * Computer terminal, a set of primary input and output devic ...
that the user will use to issue commands.


List of commands and functions

Callable functions include input and output of a character on the terminal, input and output of a byte in
hexadecimal In mathematics and computing, the hexadecimal (also base-16 or simply hex) numeral system is a positional numeral system that represents numbers using a radix (base) of 16. Unlike the decimal system representing numbers using 10 symbols, hex ...
format, print a string terminated by EOT, and terminate the current program and return control to MIKBUG. MIKBUG allows the user to install an
interrupt handler In computer systems programming, an interrupt handler, also known as an interrupt service routine or ISR, is a special block of code associated with a specific interrupt condition. Interrupt handlers are initiated by hardware interrupts, softwar ...
using the M command to specify the handler address. Listings of MIKBUG and MINIBUG monitors are available online.


References

{{Reflist, refs= {{cite book , author-last1=Wiles , author-first1=Mike , author-last2=Felix , author-first2=Andre , title=Engineering Note 100 – MCM6830L7 MIKBUG/MINIBUG ROM , date=1973 , publisher= Motorola Semiconductor Products Inc. , url=http://www.bitsavers.org/components/motorola/6800/Engineering_Note_100_MCM6830L7_MIKBUG_MINBUG_ROM_Jul77.pdf , access-date=July 11, 2022 , url-status=live , archive-url=https://web.archive.org/web/20220819212521/http://www.bitsavers.org/components/motorola/6800/Engineering_Note_100_MCM6830L7_MIKBUG_MINBUG_ROM_Jul77.pdf , archive-date=2022-08-19 (24 pages) {{cite magazine , author-last=Rathkey , author-first=John , title=A MIKBUG Roadmap... , magazine=
BYTE The byte is a unit of digital information that most commonly consists of eight bits. Historically, the byte was the number of bits used to encode a single character of text in a computer and for this reason it is the smallest addressable un ...
, issn= , publisher= BYTE Publications Inc. , publication-place=Peterborough, New Hampshire, USA , date=February 1977 , number=2 , volume=2 , pages=96–99 , url=https://archive.org/details/byte-magazine-1977-02/page/n97 , access-date=July 11, 2022
Motorola microprocessors Microcomputer software