I'll add a comment. I would make sure the modules support hardware handshaking fornlocal flow control.
These Bluetooth dongles don't at all actually emulate a wire. The flow of bytes is very different and you might find applications like tsdos suffer from timeouts and other problems arising from buffer overflows. Another good feature would be to have the dongle obey software flow control. Good luck. I've played around with Bluetooth in the past with mixed results. I wanted to have wireless connectivity to a nadsbox or online laddiealpha folder. Never got it to work well. Cheers Steve On Wednesday, October 1, 2025, Dave Everett <[email protected]> wrote: > Certainly more expensive, they used to be $11 each and they were rock > solid. I will need to order a set of the ones from Amazon and give them a > go. > > Dave > > On Wed, 1 Oct 2025 at 5:32 pm, Scott McDonnell <[email protected]> > wrote: > >> They look like expensive versions of the HC-12 modules. >> >> https://www.amazon.com/433Mhz-Wireless-Replace-Bluetooth- >> Antenna/dp/B0C7M99BQM >> >> >> On 9/30/2025 9:08 PM, Dave Everett wrote: >> >> Check out the description for these: >> >> https://ebay.us/m/drkr36 >> >> >> Dave >> >> On Wed, 1 Oct 2025 at 11:04, Scott McDonnell <[email protected]> >> wrote: >> >>> 1200 baud seems to be the most reliable. 9600 is possible, though. >>> On 9/30/2025 8:50 PM, Dave Everett wrote: >>> >>> 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. >>>> >>>>
