Electronics, DIY, Makers, Hackers and Internet of Things (IoT)
1 month ago in Blogs
I made a first prototype with a STM32F411 that I had in stock, and it happened to work fairly well
The RTC chip was a Motorola MC146818. And the plastic was easy to cut, thus I simply removed the old
3 months ago in Blogs
My old Falcon 030 is back to live : I have updated its TOS to v4.04 (was 4.01), and added
9 months ago in Blogs
Not a lot of I/Os are left and available on my Z80/PSoC module, but with some tricks, I was able
Since March 13th, the website was down, due to some network configuration changes. I have restored it this morning. JJ
Took 10 minutes today to post a Youtube video of the board, running Grant Searle’s ROM, RC2014 ROMs, S100 CPM3
It is sometimes disturbing to have such a clock running during the night because of its noise… My solution :
2 years ago in Blogs
root@libre-computer:/home/libre# dmesg [ 0.000000] Booting Linux on physical CPU 0x0000000000 [0x410fd034] [ 0.000000] Linux version 4.19.56+ (dxue@build-server) (gcc version 7.3.1
The principle used for the previous z80/CPM board support was using the WAIT signal, in response to an IORQ request
‘Smart’ tray are not available… Ended by modifying the blank fillers… I have removed the back of the filler (the
I have soldered one board (two in fact, first one was faulty…). There is still one error on the PCB,
The v4 PCB is not tested/soldered yet, but I have added preliminary support for the MBC2 binaries from the SD
New PCB arrived (corrections+added LED), not tried to solder components yet (I don’t have spare parts…)
3 years ago in Blogs
Not finished and not error-free, but yet promising Now the z80, ram and Psoc are on the same board (~
A new iteration of the concept : Romless z80sbc with a PSoC5 module that is doing bootloader/glue logic/serial output &
4 years ago in Blogs
From http://jjmz.free.fr to http://blog.pommerie-michel.fr
Schematic: PSoC4 Design :
On just one breadboard now … I removed the 32-pin flash and replaced it by an SPI-SD card breakout board. So it’s only : Z80, Ram and the Cypress 4200 module, the sdcard. A few resistors,.. It runs the Monitor/Basic...
I have started working on a Z80 board that would use only 3 parts (Z80, RAM, Glue logic+SIO). The Glue is done via a PSoC4 from a Cypress CY8CKIT-049-42xx (<5 euros…) – Currently the Flash chip is not used, and...
5 years ago in Blogs
As almost everybody, I have ordered a few esp8266 modules. For me, the existing examples are not using enough ressources of the chip : it is a 80Mhz device, with lots of memory, so… why not trying to put some...
6 years ago in Blogs
It took me a while to figure out what was wrong with my ProMicro… When trying to program it from Linux/Ubuntu, avrdude was not working, with the following error : avrdude: ser_open(): can't open device "/dev/ttyACM0": Device or resource busy...
7 years ago in Blogs
No big news regarding the STC15L204 code. I have just updated the schematic, I have simplified cabling the resistors, capacitors and the ds18b20 directly on the stc board and have made some ‘live’ tests with 2 sensors at home (one...
zx81 on stm32 mini v3
Just an update for ChibiOS 2.6.1 of the code I have to run Libmad on the STM32F4 Discovery board. Code
Well, the STC15L204 data-sheet is not very clear on some aspects (the device is simple enough to compensate…). I almost totally forgot that this device had a 512 bytes E2PROM… And I also wanted to explore its memory to try...