I am looking for a 65816 machine language monitor with 4k size at max (given that load/save/character out/keybd in are provided by the OS). And it should be open source.

I have a 6502 monitor in 4k with some advanced features that I could take out, but I can imagine that a 65816 assembler/disassembler requires quite more space than just 6502.

My goal is to integrate it into my Micro-PET ROM, replacing the @mon I currently use but which is 6502 only.

Any suggestions?

Thanks
André

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Author of the GeckOS multitasking operating system, the usb65 stack, designer of the Micro-PET and many more 6502 content: http://6502.org/users/andre/

My SBC-3 monitor used a modified version of the SBC-2 monitor and included disassembly of 65816 code. I would not classify is as "Good", but the source is given and you can take out the parts you don't need and most likely get it under 4k. it was loosely based on the Apple 2 Monitor. It is dumb in relation to 8 bit and 16 bit immediate values, but I worked around it with 2 disassembly commands - one forced 8 bit and the other forced 16 bit.

Feel free to have a look. https://sbc.rictor.org/download/sbc3.zip ... in the SysMon folder.

Daryl

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Please visit my website -> https://sbc.rictor.org/

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x86?  We ain't got no x86.  We don't NEED no stinking x86!

Undoubtedly brilliant, unfortunately 641 bytes too heavy. Unless 4 KB isn't a strict limit.

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Got a kilobyte lying fallow in your 65xx's memory map? Sprinkle some VTL02C on it and see how it grows on you!

Mike B. (about me) (learning how to github)

The plan is to have it in 4k.

But with all the other extensions I'm building into the ROM I may need to re-shuffle the memory map. I'll have a look what's most needed and maybe try to strip it.

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Author of the GeckOS multitasking operating system, the usb65 stack, designer of the Micro-PET and many more 6502 content: http://6502.org/users/andre/

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x86?  We ain't got no x86.  We don't NEED no stinking x86!

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x86?  We ain't got no x86.  We don't NEED no stinking x86!

I briefly looked at it - looks very nice.

I noticed some macros - which assembler does it need to build?

In the intro it says it's native mode - so if I normally run in emulation, I'll have to create a wrapper. Anything in particular to look at when exiting? Does it exit at a single location only ("X" command)?

Thanks
André

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Author of the GeckOS multitasking operating system, the usb65 stack, designer of the Micro-PET and many more 6502 content: http://6502.org/users/andre/

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x86?  We ain't got no x86.  We don't NEED no stinking x86!

I've been working on porting supermon816 to a Commodore PET clone using a 65816. Here's some notes / comments:

- There's an awful lot of zeropage usage. So I'll set the DP pointer to some free space (actually planning to use page 1, and use the lower half of the stack space for the about 64 bytes of used zp) I found that moving some of those out of zeropage increases overall length of the binary over the desired limit...
- Is clearing the "workspace" required for proper operation? Otherwise this code could be left out.
- How much variable space could potentially be combined? (maybe moot as DP can be relocated)
- I think the entry points should be separated out more: I am not sure setting the brk vector belongs into the monitor proper - maybe good for some 816 systems, but what on systems that do not behave like specified in the comment of that routine?
- vecbrkia is in the middle of the binary - so this prevents write-protecting the address space used for the monitor itself. This should probably also be left to the "outer shell" or "binding" to the host system?
- Some weird kowalski assembler syntax I had to adapt. How active is this assembler actually? Does it make sense to move to another assembler altogether?

I'll keep you posted.

Anyway, here is the repo: https://github.com/fachat/upet_supermon816

André

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Author of the GeckOS multitasking operating system, the usb65 stack, designer of the Micro-PET and many more 6502 content: http://6502.org/users/andre/

P.S.: it would be interesting (for me) to have a Jump or Go instruction that jumps to the code in emulation mode.
P.P.S.: terminal control codes could be expected from an "outer" shell as defined macros, to adapt to potentially differenty host systems (edit)

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Author of the GeckOS multitasking operating system, the usb65 stack, designer of the Micro-PET and many more 6502 content: http://6502.org/users/andre/