Announcement

Collapse
1 of 2 < >

Welcome back!

If you're seeing this then welcome to the NEW Vintage Computer Forums.

The forums have been updated to the latest version of the software which means new features and some changes to old ones.

Please don't be alarmed. Change is good!
2 of 2 < >

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

Tandy 1000 & 2000 Service Manual & 1000A Supplement available for download

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

  • Tandy 1000 & 2000 Service Manual & 1000A Supplement available for download

    I’ve recently had a couple of requests for the 1000A Service Manual, which is in fact simply a supplement to the 1000 Service Manual.

    While I’m at it, several years ago a few of us here also contributed to buying a very rare copy of the Tandy 2000 Service Manual, and to having the weighty tome professionally scanned.

    All 3 PDFs may now be downloaded from here:
    https://drive.google.com/drive/folde...sy3OYG779bMOis

    Note that I simply located and downloaded the 1000/1000A documents myself several years ago, although I’m not sure where I downloaded them from.

    Please upload and share all 3 on various sites for others who may be searching.

    Note that the Tandy 2000 manual includes a rare copy of the Mitsubishi M4853 800K floppy drive OEM technical manual.
    My Wish List: Vintage Mac SCSI->ETHERNET DaynaPORT LINK T DP0801 Manual, Hallock Systems gear / disk images, Copy II PC 'Enhanced' Option Board, Earth Computers ISA Z80 cards & TurboDOS disk, TRS-80 Model IV TurboDOS, Pulsar Little Big Board gear, Model 16/6000 Tandy Videotext Information System (VIS) Operator's Manual, S100 Expansion Interface (Original version which utilised an S100 32K memory card) for EACA PMC/TMZ/Dick Smith System 80

  • #2
    Thank you for finally putting out there a copy of the 1000A schematics! Bits and pieces of the 1000A supplement seem to be floating around but this is the first copy I've seen that actually has the schematics present. Sometime when I'm really lacking for anything better to do I look forward to sacking out with a copy of this and the Tandy 1000EX/SX era sheets to try to noodle out exactly what differences there are between the various ASICs. The 1000A's unique proto-"Big Blue" video chip is particularly interesting.
    My Retro-computing YouTube Channel (updates... eventually?): Paleozoic PCs

    Comment


    • #3
      Nearly 700 pages in the 2000 service manual!!

      Comment


      • #4
        Iíve just added the 48 page version of the MC-10 version, which I believe was also rare at one point.
        My Wish List: Vintage Mac SCSI->ETHERNET DaynaPORT LINK T DP0801 Manual, Hallock Systems gear / disk images, Copy II PC 'Enhanced' Option Board, Earth Computers ISA Z80 cards & TurboDOS disk, TRS-80 Model IV TurboDOS, Pulsar Little Big Board gear, Model 16/6000 Tandy Videotext Information System (VIS) Operator's Manual, S100 Expansion Interface (Original version which utilised an S100 32K memory card) for EACA PMC/TMZ/Dick Smith System 80

        Comment


        • #5
          Oops, I just cross-posted this to IBM Portable PC's original 1000A service manual thread. Oh well, that thread it is still the top Google result for now.

          The 1000A information is amazing to have. I was sure that information was lost to time. It is not quite complete - looks like the scanner missed a few pages - it is still packed with knowledge.

          Eudimorphodon, it has a similar chip to the SX's Little Blue also.

          I uploaded to Archive.org: https://archive.org/details/tandy-10...ge/n9/mode/2up

          Comment


          • #6
            Thank you!

            Comment


            • #7
              This will make a few people very happy!

              Overnight I had a thought that perhaps I did not simply download the 1000A Service Manual from somewhere as I had originally thought. Today I checked my email ( I have 22 years worth of email across about 6 accounts in Apple Mail - thank God that it remembers the things that I do not!) and PDF archives and sure enough I actually purchased the manual on eBay in 2013. I had it shipped directly to a scanning company where they experienced some issues with the fold-out circuit diagrams. It appears that they scanned the document three times with varying results. More importantly, I have been able to locate all 3 attempts. The version previously shared, which I did obviously did not check thoroughly at the time, was the final 26 Oct 2013 version. I have now clarified the filenames and uploaded all 4 versions into a seperate folder within the Google Workplaces link from my original post. I guess the next step is to take all 4 versions and merge the clearest pages in Adobe Acrobat Pro, however I do not see myself doing this in the near future. Then again by doing so something may be inadvertently overlooked. Perhaps the 4 attempts, with involved varying settings between scans, is the safest option.

              Enjoy!
              My Wish List: Vintage Mac SCSI->ETHERNET DaynaPORT LINK T DP0801 Manual, Hallock Systems gear / disk images, Copy II PC 'Enhanced' Option Board, Earth Computers ISA Z80 cards & TurboDOS disk, TRS-80 Model IV TurboDOS, Pulsar Little Big Board gear, Model 16/6000 Tandy Videotext Information System (VIS) Operator's Manual, S100 Expansion Interface (Original version which utilised an S100 32K memory card) for EACA PMC/TMZ/Dick Smith System 80

              Comment


              • #8
                That is awesome, thank you. "Tandy 1000A Service Manual 6 Jan 2014 Scan.pdf" appears to be complete. Perhaps that is one that you already assembled together. I have replaced the version I uploaded to Archive.org with that.

                Comment


                • #9
                  "Tandy 1000A Service Manual 15 Oct 2013 Scan.pdf" appears to be complete also - just has one of the 1000A schematic sheets out of order. "Tandy 1000A Service Manual - 6 Jan 2014 Scan.pdf" does have the order fixed and has all the empty pages removed, so I think that is the best one. I will leave 6 Jan 2014 as the version on archive.org: https://archive.org/details/tandy-10...ual-supplement

                  Comment


                  • #10
                    Originally posted by JayesonLS View Post
                    "Tandy 1000A Service Manual 15 Oct 2013 Scan.pdf" appears to be complete also - just has one of the 1000A schematic sheets out of order. "Tandy 1000A Service Manual - 6 Jan 2014 Scan.pdf" does have the order fixed and has all the empty pages removed, so I think that is the best one. I will leave 6 Jan 2014 as the version on archive.org: https://archive.org/details/tandy-10...ual-supplement
                    The scans are very similar, however some schematics are clearer on the later scans.
                    My Wish List: Vintage Mac SCSI->ETHERNET DaynaPORT LINK T DP0801 Manual, Hallock Systems gear / disk images, Copy II PC 'Enhanced' Option Board, Earth Computers ISA Z80 cards & TurboDOS disk, TRS-80 Model IV TurboDOS, Pulsar Little Big Board gear, Model 16/6000 Tandy Videotext Information System (VIS) Operator's Manual, S100 Expansion Interface (Original version which utilised an S100 32K memory card) for EACA PMC/TMZ/Dick Smith System 80

                    Comment


                    • #11
                      Originally posted by JayesonLS View Post
                      Eudimorphodon, it has a similar chip to the SX's Little Blue also.
                      Yep. That's one nice thing about having the schematics, it might reveal whether there'd be any reasonable possibility of adapting some of the SX/EX/HX-era chips to the 1000A for repairs. The video chip is totally out, sure, but perhaps there'd be hope for some of the others. It does put the 1000A in a pretty awkward spot that it has so many unique ASICs in it.

                      An interesting, and apparently unique, tidbit in there is it says the 1000A's video chip added support for 256kx1 DRAMs, IE, It has a ninth, unused multiplexed address line output, "MA8". Looks like they considered the idea of being able to build a Tandy 1000 with 512K onboard with no need for a DMA chip!

                      (Interestingly "Big Blue" only has 8 address lines plus a "banksl" signal, which is only used on the EX and HX to switch between its two 128kX16 bit memory banks for 512k of RAM, but the block diagram for Big Blue in the EX tech manual still shows an "MA8" hanging off the multiplexing circuitry. Last minute tweak to take advantage of the 64kx4-bit wide 256kbit chips?)

                      It does kind of make me wonder if in theory at least it'd be possible to "mad science" together a 512k-onboard 1000A. Not that there'd be any point, but...
                      My Retro-computing YouTube Channel (updates... eventually?): Paleozoic PCs

                      Comment


                      • #12
                        Originally posted by Eudimorphodon View Post
                        it might reveal whether there'd be any reasonable possibility of adapting some of the SX/EX/HX-era chips to the 1000A for repairs.
                        It does kind of make me wonder if in theory at least it'd be possible to "mad science" together a 512k-onboard 1000A. Not that there'd be any point, but...
                        For the 10 or so pins I checked, the keyboard interface/PIO IC is identical to the one in the SX. I don't know why they have different part numbers - bugs maybe, or perhaps different manufacturer. Also possible I suppose that some of the internal logic is a little different.

                        The other two, I don't think so. The timing IC has different pinout and has some functions not present in the Little Blue. I had figured this much out before we got the manual and was not looking forward to the amount of effort needed to reverse engineer it. It was quite a treat for this manual to show up out of the blue.

                        My interest has been to develop a turbo upgrade with SX timings. So far, it looks like it may be easiest to recreate most of the timing IC with programmable logic. That would also be a OK approach to make a chip replacement. I have designed this on a smaller scale for the original 1000 where I recreated the functionality of the Intel 8284 clock generator in a 16V8 GAL. It tested OK standalone - waiting on boards to arrive so I can test in a 1000.

                        The PLCC IC - replacing that with something else seems like a much more work than I want to sign up for. On the plus side, Tandy 1000's seem to be very robust.

                        Comment

                        Working...
                        X