Hi Dwight, I had also found the CPM8000 executable for the M20 on "The Unofficial CP/M Web site" (www.cpm.z80.de), but the source I grabbed at first only seemed to be for the BIOS and a couple of programs. So I thought that I would have to emulate an M20 for it to be useful. Either that or find a way to compile up a modified BIOS as you suggested. I just looked on the site again and there was a zip file with a more complete set of source. I still have no Z8000 C compiler or assembler but you do, so I might look into this a little more vigorously. David Kane -----Original Message----- From: Dwight K. Elvey [mailto:dwightk.elvey@amd.com] Sent: Friday, 3 January 2003 5:52 AM To: cctalk(a)classiccmp.org Subject: RE: Z8000-Fan Hi David It may not be as hard as you'd think. First, you don't have to cross compile CPM-8000. There already is a CPM-8000. Recently, source and release code was found for this and, working with Chris Groessle, we've managed to bring it up on our Olivetti M20's. This code was originally written for the M20, as it was the only major machine sold with a Z8000 ( there were a few SBC's out there ). The release comes with a C compiler and an assembler. There is source code for the BIOS as well. It does depend on the M20 ROM code for low level access. This CPM was mostly written by a combination of Zilog and DR people. It is mostly written in C with a minimum written in assembly. There are a few issues. Even though the manual says you can get by with only 128K, this would be difficult. Several of the utilities require two 64K chunks ( one for instruction and one for data ). It would be best if the other system functions had there own piece of RAM to work in. One needs to map the memory such that you can access a single 64K as both instruction and data as well as the 128K as 64k instruction and 64k data. The bad news is that we don't have the complete source for the CPM. The BIOS does require that it be compiled on a running CPM-8000. As the documents state, it would be difficult to build it on some other system. Still if someone is willing to write a BIOS for their board, I'd be willing to compile the code for them on my machine. Dwight have a copy of the Zilog "Microcomputer Components - Data Book Feb 1980" and a copy of "Programming the Z8000" (a Sybec book), but that is about as far as I ever got. I was tinkering with the thought of modding the SIMH emulator to include a Z8000 system, but I don't have any details or experience of any real systems. I then though to invent a fictitious S100 system, based on the existing Altair emulation, but with a Z8000 CPU. This could most likely run a CPM8000 system, with the appropriate BDOS changes. But a lot of work would be need to get a set of compilers/cross compilers for the Z8000, either in tracking them down or writing them. I saw recently that BDS C has been put into the public domain with full source, so there might be some avenue there. Still to generate CPM (or MPM) for a fictitious machine would be a mammoth undertaking, I have all the source code needed, just not the compilers. It would require an 8080/Z80 to Z8000 cross assembler (to avoid rewriting all the assembler), a Z8000 PLM compiler, and a Z8000 C compiler. family.