What was the max baud rate for the m100? I regularly use transceiver modules that do ttl rs-232. They run at 9600 but from memory that can be changed. I just don’t recall if it can go lower.
Dave On Wed, 1 Oct 2025 at 08:50, Scott McDonnell <[email protected]> wrote: > I plan to dedicate one of my Model 100s to use as a controller for my > 80s robots. > > These are my planned mods to implement this: > > 1. Internal retro wifi modem (oldnet.com) > > I plan to make hack onto the MC14412 chip. I have no plan to > retain the original modem functionality, but if I did, I am thinking I > could implement this via the modem enable signal. That would also allow > me to control power to the ESP8266 so that it did not drain the battery > when not in use. I could bring the enable line out to a switch to > reconnect the enable line to the MC14412. At the moment, I can't really > think of why I might ever want the original modem. > > I will use a Wemos D1 mini with an external antenna that I will attach > to the M100 body. > > 2. Complete my originally idea to port the TPDDuino project to the > sparkfun openlog hardware and make this internal > > Here, I am thinking the BCR TTL serial mod would be appropriate. > This frees up the serial port which I will need for the robot control. > Not sure if TSDOS already supports this, however. There could could be > some benefits to the faster speed possible with the BCR hack. > > 3. Wireless serial > > For this, I have not decided whether to use bluetooth or an HC-12 > module. This will be in an external modules so that I can use the serial > port for other purposes. I do plan to add a fused 5V output to pin 25 of > the serial port. This was a common pin to use back in the day for adding > a power output. It doesn't appear to be connected to ground in the M100 > per the schematics, but I will need to double-check. > > 4. Joystick mod mentioned previously > > If I will be using the BCR port for the TPPDuino, then I will end > up implementing the ideas discussed in that thread for using the > parallel port. But I also might just hack into the keyboard matrix > arrows since this will be dedicated for this purpose. Still weighing > this while I work on the other mods. > > ----------------------- > > Interested in internal battery hacks. I have been thinking of installing > a 7.2V nimh pack. I am not really sure it could fit anywhere inside, > though. > > While looking through old magazines, I had seen products that were > available at the time which were battery packs that also doubled as tilt > stands. I liked the look of those and might end up 3-D printing > something like that. There was a simpler project to use a PVC pipe with > D cell batteries and the author fashioned that to also act as a tilt stand. > > For my first M100, I had modified a book light to attach to the BCR port > to provide light for the LCD. I wasn't especially happy with it as the > clear plastic bezel is too glossy and reflected too much of the light. I > feel like if there were any possible enhancement here, it would need to > be some sort of front light mounted internally. This is probably outside > of how much effort I want to put into this. > > Interested in hearing about any experience and efforts into trying to > improve the readability of the LCD. > >
