Hi Tom, I did not check my copy of "Intro to Programming", because on an earlier search for a detailed description of the IOTs for a specific device (how it works and interacts with the pdp8), I remembered that the RX01 was not among them. I do have the description of the RK05 IOTs, but that is to big (capacity-wise) for a floppy disk. Perhaps I will someday have a go at it to simulate RK05 with a 100 Mb ZIP drive ... :-) Meanwhile, the link that Vince posted got me started: including the (standard a lot of) comment lines, the "#defines" and memory allocation, I have all IOTs coded in some 800 lines 6809 assembler. I guess that max 200 lines more will make it complete to put the RX01 in the simulator. As I did the DS32 and the RF08 simulation already, I have some experience in how to go about, and with the help of Vince, debugging was not too complicated (the interrupt mechanism got me puzzled for a while). thanks, - Henk, PA8PDP. ________________________________ Van: cctalk-bounces at classiccmp.org namens Tom Peters Verzonden: zo 15-01-2006 03:39 Aan: General Discussion: On-Topic and Off-Topic Posts Onderwerp: RE: looking for RX01 device IOTs for the PDP8/e I have the PDP-8e Intro to Programming (1970). I'm not exactly sure what you're looking for. If you think it's in there, I'd be happy to look for you. However, all I see here are IOTs for TU58, drum disks, scopes, recording voltmeters, TTY's, and etc. Nothing that explicitly says RX01. At 10:55 AM 1/13/2006 +0100, you wrote: 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.