Allison wrote: At 07:05 PM 9/13/01 -0400, Jim Battle wrote: Actually, my emulator can be configured for zero to four drives, and as many disks as you want to create. I used CP/M just a bit back in the day, and I'm only now learning a bit more about it. Do you have any recommendations? I've seen TED in one of the CP/M archives, but I haven't gotten far enough along to see if I can get it to run on a Sol. I have a half-completed project from a couple years ago to try and write a "vi" editor in z80 assembly that would run in 8K-12K or so, but it got interrupted by my work on the Sol. Maybe someday I'll get back to it and make a CP/M vi. I agree, other than just for completeness. I assume you mean disk, not just disk drive. If you really mean drive, then yes, you can have up to four. If you meant disks, you can make as many disks as you want. Each lives as a "virtual disk" on your actual hard drive as a binary image. Floppies can be single or double sided, single or double density. What you put on them is limited only to what software wants to put on them in the real software. In the real hardware, so in my emulated format too, sectors are actually a bit bigger than the 512 bytes so that if someone had drivers that understood some non-standard format (such as storing the track and sector information in the header instead of just counting it in the driver) it would work in the emulator too. Preamble and sync bytes are maintained in the disk image as well, so if the driver doesn't write an adequate preamble, the emulator can detect that and give a warning (if you want it to). Does your driver use a non-standard checksum? No problem, the emulator does what the hardware would. In time I hope to add emulation for the Helios disk subsystem too. Actually, I think I have enough information to emulate the hardware right now; the harder part will be getting the disk images onto a PC. Bob Stek has some old PT-DOS disks, and in time, he or I will try to dump the disk image out to a PC. I think it would be a real archeological find to get PT-DOS running again. Getting CP/M running on Solace is OK, but there really isn't much mystery in CP/M. If anybody already has a PT-DOS disk imaged somewhere from ages ago, please let me know about it. I'd love to use it to get that phase of the emulator project underway. ----- Jim Battle == frustum(a)pacbell.net