In article <[email protected]> you write:
>I've started working on a disassembly of the Digital VT320 video
>terminal, so I'm diving into 8051 assembler.

Nice!  I'm looking forward to it.  Based on your VT100 annotated
source listing, it should be a good read.

>There isn't an "A52" to match D52, so I was wondering if anyone has
>recommendations for a FOSS macro assembler that will take D52's output.

I haven't used either of these, but maybe the links will help:

gsim51: <https://gsim51.sourceforge.net/>
AS8051: <https://github.com/lukbettale/AS8051>

Unfortunately it doesn't look like either one supports a macro
facility... maybe use the C preprocessor for macros or m4?
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