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Found 10 results

  1. This is a work in progress.. will be happy to add anything missing - Greg A few bits of information, rules and guidelines on posting. Short links to our sub-forums: TI-99/4A Computers http://ti99.atariage.com TI-99/4A Development http://dev99.atariage.com Please read the AtariAge site guidelines which apply to and are enforced in our subs. Our sub-forums are divided to help cater to the varied interests in our beloved platform. The parent sub-forum, TI-99/4A Computers, contains general information and conversation regarding the TI-99/4A and its siblings, such as the 99/2, 99/8, CC-40, and BASICALCS. The sub-forum TI-99/4A Development is for conversations, information, announcements, etc. pertaining to programming, tinkering, or the development of software or hardware for these computers. This division is not intended to be a separation of the community but rather a way for those who have little interest in development but moreso in general discussions to focus their time on the fun-zone, while those who take more interest in the deep-down nitty-gritty and not so much general shenanigans to focus their attention just the same. The rest of us can spend all the time we want and will peruse both subs with reckless abandon. Insofar as development is concerned, once hardware or software has been completed or is at least ready for general consumption, an announcement should be made in the general TI-99/4A Computers forum for all to partake. Further development and inquiries should still be continued within the TI-99/4A Development sub-forum. The forum leader will move threads to a more appropriate forum. This may also be done by request should a thread be started in the wrong forum by accident or the trajectory changes from general to development or vice-versa. The forum leader will also merge identical threads started in both forums into a single thread in the proper forum. Per AtariAge guidelines, please refrain from posting identical threads in both sub-forums as way to ensure the topic gets viewed. Many people already browse both subs, and if your topic pertains more to development rather than general, or vice-versa, the thread should exist in the appropriate forum. As well, multiple threads created on the same topic in the same forum will be merged. Regular members can edit a post for 60 minutes after submission. This allows you to fix any issues you may notice with the post right away. Subscribers can edit posts for 30 days. In the Marketplace and Programming forums you can edit your posts indefinitely, since the flexibility of allowing editing of posts outweighs the potential abuse of the edit functionality. If you make a duplicate post in a thread, which can happen by accident or some unforeseen technical glitch, report the post by clicking on the "report" link at the bottom of the post and indicate in the report that the post is a duplicate. If you are not a subscriber, please help support AtariAge by using the eBay BBCodes ebay, ebayseller, and ebaystore when posting links to eBay! Click here for more information. Anything you would like to share with your fellow 99ers but is seriously off-topic for the forum may be posted in the official off-topic thread, located here To find the most popular threads click on sort by and select most popular. All of us are ready and willing to provide answers to your TI-99 questions if we can, some will just chime in if they cannot, and others will just lurk. If you have any questions specifically pertaining to the operation of our forums, please feel free inquire of the forum leader via Private Message (PM,) or one of the global moderators. BEFORE POSTING QUESTIONS PLEASE READ THE UPDATED TI-99/4A FAQ HERE: https://www.arcadeshopper.com/wp/ti-99-4a-faq/
  2. 32k sideport memory card: This is a public domain project. Open to anyone to learn from, build, sell, get rich, buy a boat... It is open for you to do as you please. The design files are on my personal project page. You have my permission. Product started shipping October of 2016 Sold through Arcadeshopper.com https://www.arcadeshopper.com/wp/?page_id=11#!/Sidecar-Peripherals-Cases-&-Power-Supplies/c/22255086/offset=0&sort=nameAsc My personal project page has design files, gerbers, BOM, etc: http://ti994a.cwfk.net/32k.html Available from Arcadeshopper.com in assembled and tested form, or kit form. See my project page for a video detailing how to assemble (if you are thinking about the kit form) [email protected] ------- Original-ish 1st Post ---------- I feel we need a simple, public domain, 32k expansion that slaps onto the side of the 4a, or side of the speech synthesizer... So I've been trying to build one. There are a number of new cartridges that require the 32k memory expansion to function. And with the Flash ROM 99 EA5 conversion craze, a console with 32k on the side can suddenly play a much larger library of classic and new TI software titles. My intent is to build and offer finished product. I envision a vertical board about 3" high by 4" deep, chips to the right, edge connector to the left. And a jumper for external or internal power. -- I've started with the circuit on TI TECH PAGES, under http://www.unige.ch/medecine/nouspikel/ti99/mem32k.htm, scroll down to do-it-yourself-card. This circuit maps logically to what Tursi describes in http://www.harmlesslion.com/text/TI%2032k%20Mod.pdf from the best of my ability to tell. Of course, I'm not in a PE-Box with this, so I have no RDBENA to worry about. So I've reduced the circuit, using the remaining 3 single line buffers in the 74LS125 to buffer MENEN, WE, and DBIN, instead of the 3rd 74LS244. I believe I have all of the addressing correct, and can actually see the LED in the circuit activate when and only when I address memory in the expansion address ranges. However, I am having a real difficult time with the memory chip, and the data bus buffer 74LS245. Maybe some of you with more experience can spot what I'm doing wrong? It seems as though I'm stuck in high-impedance mode on the data bus buffer. It is not shown in this schematic, but I've got 0.1uf caps across Vcc and Vss on all of the chips. And I'm driving the board off of an external 5v regulated supply. I'm using a 62256 SRAM and not either the 55256 Theiry called for, or the CY7C199 from Tursi's circuit. They appear to be pinout compatible with the 55256. The address lines are numbered different in the CY7C199. Here is my first schematic: PDF if you want to look more closely: 32k-side-car-schematic.pdf And a picture of all my jumper wires in use for fun: I now believe paying $30 for the 4k of ram in my mini memory cartridge was worth it, since it came with Easy Bug [email protected] ---- This post has the final schematic I designed the boards off of: http://atariage.com/forums/topic/254502-32k-expansion-for-the-side-port-released/?view=findpost&p=3590849 [email protected]
  3. SIO2

    IMG 20150520 120641

    From the album: SIO2 Projects

    32k 7800 PCB rev c
  4. I recently bought a lot of 5 99 4A's on Ebay that all had issues.So far, i've gotten 3 running. Two are perfect as far as i can see- they see the FinalGROM and the 32k sidecar(shorty from Arcadeshopper) with no problem and I can run all the FG programs that don't require F18A. The Third unit boots up fine with no FG or 32k sidecart and with the FG but no 32k sidecar, but if I include the side car, it boots to a loud noise and a black screen. Any ideas on what I should look at?
  5. SIO2

    IMG 20150520 120605

    From the album: SIO2 Projects

    32k 7800 PCB rev c
  6. Does anyone have a schematic for this board? I recently acquired two of these boards and neither of them function as a 16k board in Slot#1 or as a 32k board in Slot#2 on an 800. So I'm hoping someone has a schematic of these already that I an use to repair these... Thanks, Jay
  7. I bought one of these on Ebay from a guy in Hungary, out of interest really. Paid 35 USD including shipping to Germany. I'm pretty impressed with the size, as it is very small. And now a word of warning, because here's the downer: I'm currently not able to test it as the connector does not fit my TI-99/4a console.... Don't feel like opening my console (it's the only one I have with F18A built-in). I do am able to plug it into my Speech Synthesizer, but it's not recognized there. Would probably have to do the +5VDC pass-through: http://atariage.com/forums/topic/259662-speech-synthesizer-modifications-audioin-and-5vdc-pass-through/ Applying force on the PCB makes it bend, as that was apparently foreseen by it's designer as both left and right edges have a vertical "line" in them to help it bend. Anyway I'm posting the pictures here, as I'd like the hardware guys to chime in. Do anyone of you know the design/components ? Does bring up another question, is it time for a group effort to design a console edge connector that really fits and can be used in many future hardware projects?
  8. So I just bought a peripheral expansion box for my ti 99 4a. It has three cards including the 32k expansion. When I power the unit up, it keeps trying to access the disk drive continually and I can see that the 32k expansion light keeps coming on. when I pull the 32k expansion out and start it again, the disk drive initializes and stops running like it should. I can actually run programs that require the 32k expansion, but it keeps trying to run the disk drive and will not stop. I've opened up the expansion card and cleaned it and examined it but I can't find any problems. Any ideas on what I can do?
  9. So I recently bought a Peripheral Expansion box with a 32k expansion card. I am a newbie at this. When I power the PEB up, the floppy drive initializes and then turns on and off repeatedly every few seconds. Super annoying. I pulled out the 32k card and then the problem stopped. With the card out, it works normally. I figured the 32k card had a problem so I bought another. The new card does the same thing! Any thoughts?? I have cleaned all contacts and inspected everything but nothing seems to help. Something in my floppy drive maybe?
  10. I got the 32k sidecar and on most of my carts it works fine. TI Invaders however, will not play unless I remove the sidecar. Is this typical?
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