Hi all, I finished the tests of the DOS for the CoreSYS 6809 with the 2793 FDC extension board, and I figured that it would be nice if I can add that floppy disk drive to the pdp8/e simulator that runs on the 6809! See www.pdp-11.nl/homebrew/floppy/diskstartpage.html (at the end). I will of course not be needing 'my' DOS (except the read/write sector routines) as OS/8 will handle the file system for me. However, I need the description of the (pdp8) IOTs for the RX01 device to implement the floppy disk in the simulation. I have not been able to find that on the web, so I don't even know how difficult implementing those IOTs will be. For example, the real disk sector size is just 128 bytes, which would mean (in pdp8 emulation) that the 'virtual' sector size is 64 words. It is likely that I need some disk access translation to read/write data, but the IOT descriptions will (hopefully) make that clear. Can anybody point me to where I can get the pdp8 RX01 IOT descriptions? thanks, - Henk, PA8PDP. This message and attachment(s) are intended solely for the use of the addressee and may contain information that is privileged, confidential or otherwise exempt from disclosure under applicable law. If you are not the intended recipient or agent thereof responsible for delivering this message to the intended recipient, you are hereby notified that any dissemination, distribution, or copying of this communication is strictly prohibited. If you have received this communication in error, please notify the sender immediately by telephone and with a "reply" message. Thank you for your cooperation.