Apple II Extended Debugging Monitor, bug fix, etc.

forum.vcfed.org/index.php?threads/apple-ii-extended-debugging-monitor-bug-fix-etc.1258136/
EDM has something like that: Closed apple-Control-Reset does a CPU reset and drops you to the monitor without significantly changing the RAM state. In my current workflow with Merlin this is the easiest way to get the EDM into a fully working state so I can test my code.

PDF Apple // Extended Debugging Monitor Introduction - JD Micro

jdmicro.com/documentation/romxce/Apple II Extended Debugging Monitor.pdf
Introduction: The Extended Debugging Monitor (EDM) is a superset of the standard Apple //e monitor with which can access all of the 128K of main and auxiliary memory. It is made available on a set of modified Apple //e ROMs. The standard ROM monitor was designed to really only support 48K of memory in an Apple //. With the addition of both the language card and now the extended 80-column card ...

GitHub - AppleWin/AppleWin: Apple II emulator for Windows

github.com/AppleWin/AppleWin
AppleWin Apple II emulator for Windows AppleWin is a fully-featured emulator supporting different Apple II models and clones. A variety of peripheral cards and video display modes are supported (eg. NTSC, RGB); and there's an extensive built-in symbolic debugger. Apple II models supported include: II (original) II Plus //e (original) //e (enhanced)

Apple II Enthusiasts | I just got my ROMXE, and would like ... - Facebook

www.facebook.com/groups/5251478676/posts/10162832094318677/
I just got my ROMXE, and would like to get the DELETE key working with EDM (Extended Debug Monitor). Is there a version, or can someone tell me what I need to change in EDM ROM to make DELETE key...

Support Apple // Extended Debugging Monitor ROM #545

github.com/AppleWin/AppleWin/issues/545
Obviously it's not really needed since AppleWin has a debugger, but pretty it's cool to be able to use what the Apple firmware developers used. The most notable inclusion is assembling and disassembling 65C02 opcodes, which the //c got but the //e missed out on. I verified that when answering here ...

FAQ.sysmtr - apple2.org

www.apple2.org/faq/FAQ.sysmtr.html
This FAQ attempts to be a reference for the commands supported by the builtin System Monitor contained in the ROM of all Apple II models. As there were a number of versions of the System Monitor, I've attempted to delineate which features are available depending on which model of the Apple II is present.

Apple II Machine Language Monitor - Computer History Wiki - Gunkies

gunkies.org/wiki/Apple_II_Machine_Language_Monitor
The Apple II's ROM contains a very simple program for the display, modification and execution of memory addresses. Notably, the original Apple II starts up directly to the monitor, while later Apples would boot into Applesoft BASIC.

PDF Apple II - Archive.org

archive.org/download/appleiimonitorspeeled/Apple II Monitors Peeled.pdf
The Apple II Reference Manual contains a complete assembly listing of the Monitor program in the Apple II. The Apple II Monitors Peeled Manual (this book) contains descriptions of the various routines in the Monitor and address tables arranged by topic instead of in the sequence of location within the machine.

Going Back to EDASM, the 1980 Apple II Editor/Assembler

retrocomputingforum.com/t/going-back-to-edasm-the-1980-apple-ii-editor-assembler/1041
I don't know if I ever got hold of a copy of the Apple 6502 Assembler/Editor manual, but I must have found some sort of book somewhere because I did start playing with it a bit, and eventually even learned to poke at the system monitor and read some of the mysterious ROM listing in the Apple II Reference Manual.

Apple II: Single Step in Monitor | Applefritter - wiert.me

wiert.me/2026/02/10/apple-ii-single-step-in-monitor-applefritter/
The original Apple II monitor does have an S command to single step code in the Monitor. That was removed however to add other features and was not restored until ROM00 of the //c. There are however various 3rd-party ROM images that also have the Step and Trace commands, for example ROMeX and ROM4X, APPLEII.EDM, etc.
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