Curious! What was the .gov web page that had these docs?
Steve
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From: Roland van straten via cctalk <[email protected]>
To: [email protected]
Cc: Roland van straten <[email protected]>
Reply-To: "General Discussion: On-Topic and Off-Topic Posts"
<[email protected]>
Date: Wed, 27 May 2026 11:09:57AM GMT+00:00
Subject: [cctalk] MC6800 MUDBUG
Dear all,
I came across MUDBUG a monitor for the MC6800. It is much more “sophisticated”
then MIKBUG and friends…
I did find a report at a .gov website that shows the manual and schematics.
Could not find anything on the website of Arizona State University which did a
great part of the development.
The question is if there is a) a S19 file, but rather the asm source code?
It would be nice historically to add this to the legacy of mikbug, minibug, etc.
Regards, Roland
MUDBUG
MUDBUG was a monitor and debugger program created for the Motorola 6800 by
developers at Arizona State University in the mid-1970s. Designed as a resident
system tool for low-level program control, MUDBUG provided early microcomputer
users with interactive facilities to inspect, modify, and debug memory and
registers. It exemplified the era’s shift toward software-based development
environments for new microprocessors.
Key facts
Platform: Motorola 6800
Type: Machine-language monitor/debugger
Developed at: Arizona State University
Period: Circa mid-1970s
Purpose: Memory and register examination, program testing, and I/O control
Background and development
MUDBUG emerged shortly after Motorola’s introduction of the 6800 microprocessor
in 1974, a period when educational and research groups built tools to support
the device’s use in embedded and teaching contexts. Arizona State University’s
version extended the capabilities of Motorola’s own MIKBUG monitor, offering
improved memory handling and command flexibility for laboratory instruction and
small-scale system development.
