Bill, I?m not familiar with the program they mention for the AIM65, but in Section 9 of the User?s manual on bitsavers is a good description of how to set up cassette recorders with the AIM65. If the recorder has a pause input the AIM65 can control the tape both during read and write. If two cassette tapes were available It could read assembly source code from one and write object to the other. (When the computer came with 1K Ram expandable to 4K you did stuff like that. On page 9-13 they do have two short test programs ?SYN Write? and ?SYN Read? that can be used to adjust record and playback volume as well as the VR1 pot on the AIM. If they are just looking for ways to save and load programs the best way was to utilize Teletype interface that is described on page 9-26. The described interface is for the current loop that ASR33?s had but that is pretty easy to change to RS232 with some external chips. With that interface 240 characters per second could be read or written. If you upgraded the RAM a bit with an external board the AIM was quite a nice 6502 development tool. I built a number of things with it. 1. Instrument to measure the stability of vegetable oils. (See ?Oil Stability Index?) This analytical method is still used today but with more modern systems. It used a ICL7109 12 bit A/D, 16 relays, a pen plotter, and a home built conductivity circuit with 32KB Ram with software burned to 2532 EPROMs. We wrote the source on a PDP-11/24 and loaded it into the AIM65 for local assembly and store to RAM. We used 2K Byte battery backed up RAM (MK48Z02B-25) on the AIM till debugged then burned an EPROM. 2. A data acquisition system for a Perkin Elmer AA / Graphite Furnace. 3. A converter to change 66.67 baud 6 bit ticker tape code to 9600 baud ASCII. (see https://en.wikipedia.org/wiki/Ticker_tape <https://en.wikipedia.org/wiki/Ticker_tape> ) Believe or not there was one commodity exchange still transmitting their data in this format in the 1980s and Our PDP-11/44?s DZ11 interface could do 50,75,110 and higher baud but could read this data. This used a 6522 to generate 16 times the 66.67 baud and was fed to a UART to read it. 64 byte program, and 64 byte look-up table. 4. A remote monitor that provided video output, and RS232 data recording from 9 digital temperature meters. The meters were read by counting their clock pulses during the down slope of the dual slope meter allowing each meter to be read with three wires (Ground, Clock, Gate) that were switched with 74150 Chips. So I have found memories of the AIM65 and the last time I had it set up about 2 years ago it still ran fine. Mark Date: Sat, 21 Jul 2018 11:27:36 -0400 From: Bill Degnan <billdegnan at gmail.com> To: cctech <cctech at classiccmp.org> Subject: AIM 65 Cassette Test Program Hi all...I got the following through my web site. Does anyone have a good known-working test program for an AIM 65 cassette that I can attempt and or send in response? I still have to set mine up and attempt to reproduce, but someone here likely has more experience, it has been at least 5 years since I powered mine on. Also, the article this guy references from MICRO April 1979 volume 11 is not present in my copy of MICRO, he may be mistaken in his reference. I don't know what cassette program he is referencing. I do know that the cassette test program that comes in the Rockwell AIM 65 manual is in error, but I don't have the corrections. I also know that one needs the correct (optional otherwise) power lines when using cassette. Bill VintageComputer.net Inquiry - I am one of the founders of the Computer Museum in Basel (CMBB/CMGB). We have 2 AIM 65 units that seem functional. However, we're experiencing problems with the cassette drive when trying to read back. We tried to record using cassette recorders and also a modern PC through line in and the audio signals are clearly recognizable (from pin M). A connection to pin L and using the corrected program to test readback from "micro_11_apr_1979_text_syn_read_program_AIM65.pdf" only displays the "N" on either AIM 65 system. The cassette interface potentiometers are sealed in one of the units by the manufacturer and have never been changed as far as we can tell. Is there anything we could try to get reading from tape to work? We are running our of ideas. Is there any way to visualize the incoming signal through a small program other than the one from the magazine?