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. >>> >>>
