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see http://compilers.iecc.com/comparch/article/87-06-002 amd has several products: AMDASM, META29M these days Hale from HIlevel tech costs 2300$+ http://meta-assembler.com/ AMDASM is documented in the bit slice bible Mick and Brick (Bit Slice Microprocessor Design). Check out http://users.ece.gatech.edu/~hamblen/book/wintim/ based in a TI TIM microcode assember, Output supports AMDASM format. you'll have to enter in your own machine definition. 2901 instruction avail from databooks or 2910 instructions here http://www.donnamaie.com/BITSLICE/BIT_CHAP_4/bitCh4B2.html Alas. it's only for win-blows.. c++ source is include if 'you want to port to *nix... It is possible to define the standard 2901 and 2910 codes using AMD's mnemonics, but the custom bitfields of your microstore would need to be defined. Have a look at the KS10 microcode sources for a sample of what DEC did on that 2901 design, possibly other DEC machines (I think also Vax 730 was 2901 based). Looking at DEC's source- perhaps a Perl AMD used to prove a free fortran source for their PALASM to code for their early PALs.. AMDASM was rumoured to be distributed as fortran source, but I have been unable to find it online (or any where else for that matter). PALASM was published at the back of their PAL data books, don't know if AMDASM was. From: "emanuel stiebler" <emu(a)ecubics.com> To: <cctalk(a)classiccmp.org> Sent: Wednesday, May 22, 2002 8:36 PM Subject: Re: AMD 2901 Microcode Meta-Assembler