 
Check out D51 for a GPL disassembler for the 8048. I've typically assembled programs by hand. For an open source cross assembler, check out asl. For instance, here is a hand-assembled listing of this 8048 binary for a PV charge control project I designed. If I run D51 against the binary:
D48 8048/8041 Disassembler V 3.0
Copyright (C) 1996-2002 by J. L. Post
Released under the GNU General Public License
reading mem.bin
No control file found
Pass 1 - Reference search complete
Pass 2 - Source generation complete
Pass 3 - Equate generation complete
Done[usr-1@wrk-1 LINUX]$
Here is the output file. Pretty nice, eh? If I take this same output file, add the line CPU 8048 to it, call it mem.asm, and run:
asl mem -l
I get this file.
If I then run:
p2bin mem.p
I get the same binary I started with. So very nice. My days of hand assembling may soon be over.
I put both of the above files up on Hackinjoe's files:
asl-1.41r5.tar.gz
d51v30.zip
The asl program will assemble many, many different kinds of CPUs. The D51 program will disassemble Z-80, 8051, as well as 8048 code.
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