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Found 7 results

  1. Back in the day there were a ton of TI-99/4A consoles released into the wild, most of them went 'unexpanded', many ended up in the back of a closet never to see daylight for decades. Why? Because the system add-ons were very expensive, so by the time prices came down, TI had abandoned the home computer market and people had moved on to newer, faster and more powerful computers. An unexpanded TI was very nearly worthless, it still is, but now with this affordable and easy to use 32K device, almost anyone can enjoy the latest and greatest games for the computer at a very affordable price.
  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. 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?
  4. SIO2

    IMG 20150520 120641

    From the album: SIO2 Projects

    32k 7800 PCB rev c
  5. 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?
  6. SIO2

    IMG 20150520 120605

    From the album: SIO2 Projects

    32k 7800 PCB rev c
  7. 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
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