Announcement

Collapse

Forum etiquette

Our mission ...

This forum is part of our mission to promote the preservation of vintage computers through education and outreach. (In real life we also run events and have a museum.) We encourage you to join us, participate, share your knowledge, and enjoy.

This forum has been around in this format for over 15 years. These rules and guidelines help us maintain a healthy and active community, and we moderate the forum to keep things on track. Please familiarize yourself with these rules and guidelines.


Remain civil and respectful

There are several hundred people who actively participate here. People come from all different backgrounds and will have different ways of seeing things. You will not agree with everything you read here. Back-and-forth discussions are fine but do not cross the line into rude or disrespectful behavior.

Conduct yourself as you would at any other place where people come together in person to discuss their hobby. If you wouldn't say something to somebody in person, then you probably should not be writing it here.

This should be obvious but, just in case: profanity, threats, slurs against any group (sexual, racial, gender, etc.) will not be tolerated.


Stay close to the original topic being discussed
  • If you are starting a new thread choose a reasonable sub-forum to start your thread. (If you choose incorrectly don't worry, we can fix that.)
  • If you are responding to a thread, stay on topic - the original poster was trying to achieve something. You can always start a new thread instead of potentially "hijacking" an existing thread.



Contribute something meaningful

To put things in engineering terms, we value a high signal to noise ratio. Coming here should not be a waste of time.
  • This is not a chat room. If you are taking less than 30 seconds to make a post then you are probably doing something wrong. A post should be on topic, clear, and contribute something meaningful to the discussion. If people read your posts and feel that their time as been wasted, they will stop reading your posts. Worse yet, they will stop visiting and we'll lose their experience and contributions.
  • Do not bump threads.
  • Do not "necro-post" unless you are following up to a specific person on a specific thread. And even then, that person may have moved on. Just start a new thread for your related topic.
  • Use the Private Message system for posts that are targeted at a specific person.


"PM Sent!" messages (or, how to use the Private Message system)

This forum has a private message feature that we want people to use for messages that are not of general interest to other members.

In short, if you are going to reply to a thread and that reply is targeted to a specific individual and not of interest to anybody else (either now or in the future) then send a private message instead.

Here are some obvious examples of when you should not reply to a thread and use the PM system instead:
  • "PM Sent!": Do not tell the rest of us that you sent a PM ... the forum software will tell the other person that they have a PM waiting.
  • "How much is shipping to ....": This is a very specific and directed question that is not of interest to anybody else.


Why do we have this policy? Sending a "PM Sent!" type message basically wastes everybody else's time by making them having to scroll past a post in a thread that looks to be updated, when the update is not meaningful. And the person you are sending the PM to will be notified by the forum software that they have a message waiting for them. Look up at the top near the right edge where it says 'Notifications' ... if you have a PM waiting, it will tell you there.

Copyright and other legal issues

We are here to discuss vintage computing, so discussing software, books, and other intellectual property that is on-topic is fine. We don't want people using these forums to discuss or enable copyright violations or other things that are against the law; whether you agree with the law or not is irrelevant. Do not use our resources for something that is legally or morally questionable.

Our discussions here generally fall under "fair use." Telling people how to pirate a software title is an example of something that is not allowable here.


Reporting problematic posts

If you see spam, a wildly off-topic post, or something abusive or illegal please report the thread by clicking on the "Report Post" icon. (It looks like an exclamation point in a triangle and it is available under every post.) This send a notification to all of the moderators, so somebody will see it and deal with it.

If you are unsure you may consider sending a private message to a moderator instead.


New user moderation

New users are directly moderated so that we can weed spammers out early. This means that for your first 10 posts you will have some delay before they are seen. We understand this can be disruptive to the flow of conversation and we try to keep up with our new user moderation duties to avoid undue inconvenience. Please do not make duplicate posts, extra posts to bump your post count, or ask the moderators to expedite this process; 10 moderated posts will go by quickly.

New users also have a smaller personal message inbox limit and are rate limited when sending PMs to other users.


Other suggestions
  • Use Google, books, or other definitive sources. There is a lot of information out there.
  • Don't make people guess at what you are trying to say; we are not mind readers. Be clear and concise.
  • Spelling and grammar are not rated, but they do make a post easier to read.
See more
See less

WTB: John Bell Engineering Boards/Documentation

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

    WTB: John Bell Engineering Boards/Documentation

    I'm looking for documentation and devices made by John Bell Engineering. In particular, I'd like to find a 6502 CPU module, the EPROM programmer and a solid-state switch or two, though I'll likely be interested in other devices as well. Devices need not be in working condition.

    Any documentation will be scanned and made available online.
    Check out The Glitch Works | My Retro Projects | Vintage Computer Services | Glitch Works Tindie Store -- Vintage Computer Kits and More

    #2
    I have to ask, why?

    I've got a couple of the CPU boards (80-153 and 82-300) but I still have this silly notion that I might actually use them some day; not much to 'em though.

    Documentation consists of a hand drawn schematic, a page of assembly instructions, and photocopies of relevant Rockwell data sheets

    Also a 12 page 'catalog'...

    Comment


      #3
      Originally posted by MikeS View Post
      I have to ask, why?
      Eh, it's an old 6502 SBC to play with a little. I could whip most of it up point-to-point in a couple of hours, but the boards seem to be well-designed (I've got one of the 6522 boards for the Apple II). Some of the Blacksburg Group 6502-related books used John Bell products in the examples, so I think it'd be neat to have some of the boards to go with the books -- both of which actually get used.
      Check out The Glitch Works | My Retro Projects | Vintage Computer Services | Glitch Works Tindie Store -- Vintage Computer Kits and More

      Comment


        #4
        Well, like I said I'm not quite ready to part with the boards yet but if I can find a scanner somewhere among this junk I could scan the schematics, such as they are. These two boards are really bare bones, 6502/6532/EPROM and 6502/6522/'LS10/2x2114/EPROM.

        2.JPG1.JPG
        Last edited by MikeS; August 1, 2012, 06:48 AM.

        Comment


          #5
          Crystal? We don't need no stinkin' crystal!
          Check out The Glitch Works | My Retro Projects | Vintage Computer Services | Glitch Works Tindie Store -- Vintage Computer Kits and More

          Comment


            #6
            Originally posted by glitch View Post
            Crystal? We don't need no stinkin' crystal!
            Nah, two resistors and a cap.
            You want a crystal? Replace C2.

            Comment


              #7
              That seems to be common with early 6502 designs. The OSI 400 board does the same. Of course, the more "critical" ACIA timing is provided by a 555 timer with a pot!
              Check out The Glitch Works | My Retro Projects | Vintage Computer Services | Glitch Works Tindie Store -- Vintage Computer Kits and More

              Comment


                #8
                I finally found one of the 6502 SBCs with documentation -- the 80-153. I scanned the documentation (all three pages) and made them available here:

                http://filedump.glitchwrks.com/manua.../6502micro.pdf

                It is indeed every bit as simple as it looks. This would be very easy to duplicate if someone wanted to just wire-wrap their own and doesn't specifically want the John Bell board. More to come as I test it out. Still looking for other John Bell stuff mentioned above!
                Check out The Glitch Works | My Retro Projects | Vintage Computer Services | Glitch Works Tindie Store -- Vintage Computer Kits and More

                Comment


                  #9
                  Sorry, looks like I dropped the ball on this one; glad you found one elsewhere. There was a revision, connecting phi2 to pin 11 of the 'LS10, "to improve memory response".

                  That's the deluxe version BTW; the 82-300 is only 3 chips
                  (CPU, EPROM & RIOT)

                  We really must get together and compare what, if anything, still remains on our respective want/offer lists...

                  Meanwhile, Happy New Year!!

                  Comment


                    #10
                    Anyone here buy this one for $40?

                    http://www.ebay.com/itm/360547694360

                    Comment


                      #11
                      That would be the one I purchased! A little bit more than I think it's really worth, but I've been looking for one for a while, and it's not really /that/ much for something that's going to get used in a project anyway.
                      Check out The Glitch Works | My Retro Projects | Vintage Computer Services | Glitch Works Tindie Store -- Vintage Computer Kits and More

                      Comment


                        #12
                        Originally posted by glitch View Post
                        That would be the one I purchased! A little bit more than I think it's really worth, but I've been looking for one for a while, and it's not really /that/ much for something that's going to get used in a project anyway.
                        Sorry 'bout that; you should have reminded me, woulda been cheaper (and included the 6502 )

                        Oh well, at least now I know what to price mine at...

                        Comment


                          #13
                          Slim

                          I have the doc's for SLIM, which was the 6502 monitor program for the 6502 PCB. Did you ever find the schematics for the 6502PCB? I cant get the links in this thread to work.

                          Jeff
                          p h y s i c i s t at cox.net

                          Comment


                            #14
                            May I ask if anyone has come across a copy of the John Bell 82-300 document with schematic on-line, please? I'm interested in the 26 pin connector signals.

                            TIA... Happy Holidays & Cheerful regards, Mike

                            Comment


                              #15
                              Originally posted by Mike, K8LH View Post
                              May I ask if anyone has come across a copy of the John Bell 82-300 document with schematic on-line, please? I'm interested in the 26 pin connector signals.

                              TIA... Happy Holidays & Cheerful regards, Mike
                              Got your PM today and yes, I have the schematic, such as it is; just have to dust off a scanner.

                              m

                              Comment

                              Working...
                              X