On Wed, Feb 9, 2022, 5:16 PM Rod Smallwood via cctalk <cctalk@classiccmp.org> wrote:
> Hi > > We have narrowed the problem down. > > Its the instruction decode ROM's that are the issue. > > The images of those are whats needed. > Do those chips have ROM numbers on them? 23-xxxxx is the usual format... Warner Regards Rod > > > On 09/02/2022 23:14, Sytse van Slooten via cctalk wrote: > >>>> On Tue, Feb 8, 2022 at 7:04 PM Warner Losh <imp at bsdimp.com> wrote: > >>>> I found > >>>> > https://deramp.com/downloads/mfe_archive/011-Digital%20Equipment%20Corporation/08%20PDP-11/01%20PDP-1104-1134/05%20PDP-1104-1134%20Microcode/ > >>>> which has the source code... > >>>> > >>>> But I couldn't find the tools to use these files to create microcode > >>>> images. > >> Actually, the "m8266_ucode.v.txt" there seems to actually be the > program that > >> produced the symbolic dump (which is also available at: > >> > >> http://www.bitsavers.org/pdf/dec/pdp11/1134/m8266_ucode.out.txt) > >> > >> It looks like the program is in VHDL or something like that, but it > doesn't > >> seem to have the actual microcode (was it stored/defined in another VHDL > >> file?); that raises the question of where the actual microcode that it > was > >> dumping was. > > It's Verilog (the 'other' hardware language besides VHDL), and indeed > the rom images are in other files/modules - in some kind of straight binary > format, I'd guess. > > > > I'm properly intrigued why someone would choose to do this - which seems > to be mostly listing the microcode in a readable format - in Verilog. > Unless of course it would be with a long term goal of using that microcode > in an emulator that is sufficiently like a 'real' 11/34 to run it > unchanged. I wonder if that is the case, and what became of the project - > since the files are from 2014, it's probably safe to assume it got stuck > somewhere along the way. > > > > Somewhere way down on my list of things to explore is something similar > but then for the 11/70 - to make a vhdl version that is microcode > compatible with the original, unlike the current pdp2011 that's 'only' > functionally compatible. And this is about exactly the same way I would > start - except I don't have the '70 rom images yet... If anyone has them > and is willing to share, drop me a note ;-) > > > > Cheers > > Sytse > > > > >
