Hello again. I have another matter that could be interesting for somebody (I hope). The Yaze CP/M emulator v.1.20 comex with support for switched memory banks (in appearence). I couldn't review the source code by now. Somebody did it ? I should like to reconstruct one simple MP/M system under it. I know some source code can be donwloaded from http://www.cpm.z80.de and I did it, bit my next problem is related with the modules needed to construct the OS nucleus, and the order of these modules. I could need a hand too with CP/M. I have some doubts about the paper of the CBIOS.ASM and BIOS.ASM modules. Finally, I'm interesting about one fascinating CP/M emulator, the ZRPM. It does one emulation of diverse models of computers that could run CP/M like the Osborne and the Kaypro. I can say that I've loadad two versions of Wordstar for every computer under the same emulator, and loaded one or another adjusting settings internally in the ZRPM telling it was worked in a Kaypro or Osborne portable. I thought all these matters was under control of the BDOS but here are more misterious. Right ? What exactly ? Thanks and Greetings Sergio