Cassette Signal Issue
SHARE |
|
|
by Bill Degnan - 07/21/2018 11:07 |
|
Juergen writes:
> > VintageComputer.net Inquiry Contact Information Name: CMGB > Email: cmuseumgb- at -gmaildot com Comments: > In regards to blog post titled Rockwell R6500 (AIM 65): > 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? > > Kind regards from Basel > > Juergen > My reply: My first thought is that the power isn't right, the cassette needs an extra line I believe 12V, but I have to check. I have these notes: Corrections to Guide which talks about the cassette test routine being in error. I assume the PDF you're referencing corrects this. I don't know where micro_11_apr_1979_text_syn_read_program_AIM65.pdf is located (on this site?) so I will have to consult an original copy of the magazine and get back to you. Reply |
|
Resources:
Popular Topics and FAQs
Past Issues:
Before we switched over to a blog format, past page archives here:
Vintage Computer Festival East 3.0 June 2006
Commodore B Series Prototypes July 2006
VOLSCAN - The first desktop computer with a GUI? Oct 2006
ROBOTS! - Will Robots Take Over? Nov 2006
Magnavox Mystery - a Computer, or? Jan 2007
The 1973 Williams Paddle Ball Arcade Computer Game Feb 2007
The Sperry UNIVAC 1219 Military Computer May 2007
VCF East 2007 - PET 30th Anniversary June/July 2007
The Electronic Brain August 2007
Community Memory and The People's Computer Company October 2007
Charles Babbage's Calculating Machine December 2007
Vintage Computing - A 1983 Perspective February 2008
Laptops and Portables May 2008
From Giant Brains to Hobby Computers - 1957 to 1977 August 2008
Historic Computer Magazines November 2008
World's Smallest Electronic Brain - Simon (1950) December 2008 - Feb 2009
Free Program Listings Spring 2009
Computer Music Summer 2009
Popular Electronics Jan/Feb 1975 - Altair 8800 Fall 2009
Early Microcomputer Mass Storage Summer 2010
VCFE5 imsai8080
This image was selected at random from the archive. Click image for more photos and files from this set.