Today I removed the small buttons board from the explorad breadboard to a new breadboard with a Teensy 2.0:The yellow wire is the Serial1 Tx line (TTL, nothing fancy like RS232).The code currently just debounces the buttons and sends a short string over...
I sat around thinking about what I useful thing I could build in one square inch of PCB, I decided on something with blinky lights or a display. Further refining the idea, I settled on a minimalist display for a Raspberry Pi.Hmmm, this might just work....
I've been programming furiously. I have 16-bit functions going - Add, Subtract, and Divide. And I have 8-bit multiply going. I've changed from putting the operands on the stack to having a dedicated memory location for them. I...
Step by step...I'm quite advanced now with the soldering of the boards. However I'd like to test the multiplexing of them.First I start to think how mount everything on the screen back :It fits very sharp on the diagonal.I decided to switch to a smaller...
I felt like building an FPGA slice, so I did.Based somewhat upon Nick's Blog entry here.Sorry for the bad photo, my phone has issues. Essentially the bottom three ICs are 74hc595 (CMOS logic levels) for allowing an arduino to program...
The "big chip"... Possibly a custom chip just for this device. I've not found any details as yet. The "smaller chips"... Plenty more details on these: INTERSIL ICL7642ECPD - S8936 - Dual/Quad, Low Power CMOS Operational AmplifiersMAXIM MAX232CPE - RS-232...
One can add slow mode hardware to a ZX80, but I decided to buy a board with this designed in already. 2023-08-19 I bought these boards on eBay. The logic board has some nice features. The bus signals are available on a holes for a header, allowing...
The tests so far have proven that the theory can be realised and so it is time to make the circuit more permanent. First task, move the circuit from breadboard to proto/perf board.The layout is nothing too complex and can be constructed out on...
This was always a stretch goal, but it looks very doable now the design is complete... and it wouldn't be the first TTL Computer on the Internet. What is the scope of Internet-enabled? Connectivity is via the RS232 port. This provides an ancient but...
There are many tutorials on connecting GPS to a Raspberry Pi available online so I followed some of them to connect a GPS sensor I had laying around to the Pi Zero. The best resource I found for this was https://learn.adafruit.com/adafruit-ultimate-gps-on-the-raspberry-pi...
One of the first parts in technical papers is a survey of existing works. Z8000 board (the Trump Card) by Steve Ciarcia in Byte magazine Hardware: A full-length ISA board as a slave to the PC. Most of it is a massive array of sixty-four 4164 DRAM...
About five days of coding and debug of the tCam and tCam-Mini firmware has yielded the first attempt at a higher performance version of tCam with the Lepton VoSPI pipeline and json image encoding being performed by the ESP32 on a tCam-Mini and the rest...
The hardware is rather simplistic. It consists mainly of 4 LEDs and tactile switches surrounding the MCU. Lets have a look at the chip itself. The chip itself is part of chinese STCmicro line of 8051 derivative MCUs. It sports a 1T architecture compared...
One of the final things missing from the Yellow MSX series of kits for the RC2014, is the ability to access typical MSX storage devices (floppy and cassette). Without storage such as this, its hard to claim that we have achieved full MSX compatibility....
General view Once opened, the device looks like a small computer. There is plenty of room for "upgrades" in there. The power supply connector to the motherboard looks to be a v1.x type with 20 pins, and it has 2 SATA power connectors. AC input is in...