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About brain

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  1. $eb3d in the 1541 ROM sets the drive address based on PB5/6, but it masks off additional bits. If someone had a mapping for devices > 11, it must be a custom ROM or a clone drive. But, a device can be anything from 8-30, as I recall. You set set the device number via SW using a program on the test/demo disk. Jim
  2. Impressive, and I think you should send David your comment "Yesterday, after watching the 8-Bit Guy's newest episode on "How Speech Synthesizers Work", which, unfortunately omitted any mention of the TI-99/4A or, frankly, anything about how speech synthesizers actually work, I was inspired to make my own speech on my TI-99/4A.", as I think that he should know that his episode missed the mark in such a large way. Jim
  3. I'm not the most knowledgeable TI guy, but Waterloo is not a big deal for me (It's two hours for me as well, but my son goes to college in Cedar Rapids, which is halfway, so I am certain my wife would enjoy being ferried up to see the son). If you all are looking for a local person to go up, and can arrange a way to be on Discord or Slack or something real-time so I can have a lifeline for the stuff that stumps me, I'm happy to drive up (yes, alterior motive, I need to grab some more TI stuff in order to design and sell products for the platform). Let me know (PM, or email) Jim Brain RETRO Innovations
  4. brain


    Is there a schematic available? Maybe someone could wire one up.
  5. Wow. Have we really moved that far into the future that centronics parallel is so unknown? :-) (Not trying to diss the OP, it's not a bad question, just surprised. JIm
  6. They had a good (if somewhat dubious as to usefulness) story on RAM until they looped in the cartridge. Jim
  7. OK... Sorry for the long delay. As noted, I am moving to a larger uC, so I had to rework things a bit. The good news is that I have the basic load/save working again and am working to implement more of the protocol. Still a ways off (I spent the last 2 weeks tracking down an interrupt issue), but I have not forgotten the project or the goal. Keep bugging me. I am still trying to deliver. Jim
  8. This allows one to hook a TI99/4a KB up to a PC. I think Matt's connects a USB KB to a TI.
  9. Well, as someone trying to emulate the cc-40 devices, I've been looking for units to attempt the finish the emulation for my HEX-TI-r project listed elsewhere on the forum. That said, you have quite a few prized possessions, so I suspect you can make quite a bit by selling to someone.
  10. Well, the Arduino version works, and anyone can wire it up. Code is on the site. I am moving to a larger uC so I can get the bootloader to fit... Mainly, though, work has interfered, but I do quite a bit of my stuff during the Winter, so hopefully I cna put some more into this in the next month or so. Jim
  11. Not sure where you're getting your information, but your could most definitely not get a coco for cheaper. The VIC-20 was $299.00 or so in 1980 https://laughingsquid.com/1980s-commodore-vic-20-computer-ads-featuring-william-shatner/ while the 4kB CoCo1 was $399.00: http://www.radioshackcatalogs.com/catalogs_extra/1981_rsc-04_small/ None of the other machines was cheaper. The Atari I think was closest in price.
  12. Arduino support is working. I had to move a few pins, as the real time clock on this shield uses a few of the pins. Instructions are in https://github.com/go4retro/HEXTIr/tree/master/doc/arduino The shield does not automatically connect Card Detect (CD), Write Protect (WP), and the LED (L1) to the Arduino pins, so one must do that. To build, you'll need make, the avr-gcc tools, avrdude, awk, and I think that's it. make CONFIG=config-arduino program fuses Replace in config-arduino the AVRDUDE_PORT with your Arduino COM port. Mine is COM32. Let me know if someone gets it running.
  13. Sorry about the delay. Work and Life happened, etc., blah, blah. I have pushed the first pieces of Arduino support into the repo: https://github.com/go4retro/HEXTIr/ I am still getting a return code of 01 on SD card mounting, so looking into that. Once I overcome that, I should be ready to test. For those with the Arduino Uno and a SD shield, feel free to pull down and get the dev environment up and running. I am not using the Arduino dev environment, as moving the code over to arduino C++ was a large undertaking, and Arduino is not the final platform. But, I am hopeful folks can get a dev env going quickly. Feel free to ask questions. Jim
  14. I think anything with an SD card connected to the MISO/MOSI/CLK/SS lines would be fine. Jim
  15. https://www.ebay.com/itm/Data-Logger-Module-Logging-Shield-Data-Recorder-Shield-for-Arduino-UNO-w-SD-Card/191883132426?hash=item2cad203e0a:g:VbMAAOSw6btXSRTw
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