[Please excuse the lack of threading - I read cctalk in digest form.] On Wed, 3 Feb 2016, Jim Simpson wrote: Jim (and other cctalkers), Grab a copy of the SIMH Altairz80 simulator from http://schorn.ch/altair.html and the zip file of my cpmplus for the CompuPro Disk1 controller from the Other Operating systems link at http://schorn.ch/altair_5.php This supports IMD disks in BB II 1.4Mb (1024byte x 9 sector) format. You can attach the IMD file and use the "W" command to extract files to the host operating system - mini:cpmplus tony$ altairz80 cpm3bk Altair 8800 (Z80) simulator V4.0-0 Beta git commit id: 4ff1e317 LDRBIOS for SIMH System - V3.2-Y2K 01-AUG-2008 DISK1 8" boot floppy CPMLDR3 - CP/M V3.0 Loader Copyright (C) 1982, Digital Research BNKBIOS3 SPR FA00 0600 BNKBIOS3 SPR C600 1A00 RESBDOS3 SPR F400 0600 BNKBDOS3 SPR 9800 2E00 61K TPA CP/M Plus for SIMH System - V3.2-Y2K 06-AUG-2008 Banked memory CCP loads from A: and reloads from bank 0 DISK2 dual 20Mb M20 winchesters (A-F) DISK1 8" (I-L) [BB-II] floppies A>SETDEF * A: [ORDER=(COM,SUB) DISPLAY UK] Drive Search Path: 1st Drive - Default 2nd Drive - A: Search Order - COM, SUB Program Name Display - On Date format used - UK A> <CTRL-E> Simulation stopped, PC: 0FE8F (AND 02h) sim> att disk1a3 ../s100/BB2-011.IMD sim> go A>l: %FDDISK1 unit 3 is type BigBoard-II 1024x9 Read-Only L>dir L: BULLETIN : BYE COM : CALL-JAN PQN : COMMANDS HLP : DIR COM L: ELAPSED COM : HELP COM : HELP HLP : INFO : MAGAZINE HLP L: MBOOT ASM : NEWS : PAMSFEB1 0Q6 : PASSWORD COM : RBBS COM L: TYPE COM : USERDISK CQT : WHATSNEW HLP : XYAM COM : XYAMHELP T SYSTEM FILE(S) EXIST L>w A:W COM WRITE V-1.17 (01-Mar-08) SIMH Interface V004 Usage: WRITE <file name> [B|T] Copy <file name> to host environment. Default is text, B for binary, T for Text Examples WRITE BDOS.MAC copy BDOS.MAC as text file WRITE PIP.COM B copy PIP.COM as binary file WRITE PIP.COM copy PIP.COM as binary file [.COM .REL .DAT imply B] WRITE TEST.DAT T copy TEST.DAT as text file WRITE *.COM copy all files matching *.COM as binary files WRITE SRC/BDOS.MAC copy BDOS.MAC to directory SRC as a text file WRITE COM/*.COM B copy *.COM to directory COM as binary files L>w type.com b A:W COM WRITE V-1.17 (01-Mar-08) SIMH Interface V004 Write "TYPE.COM" to "TYPE.COM". 3.5kB written (Binary). If you need to support other CP/M disk formats, the BIOS source files and submit files to put them together are in the A1: directory on the hard disk image. There's also CP/M program to make IMD disk images natively under CP/M-Plus in A3: (it will span the IMD file across multiple floppies if the image file is too large). I used this to copy all my 8" floppies (including BB II ones) to IMD images. Tony -- Tony Nicholson <tony.nicholson at computer.org>