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I analysed my project again according to additional information regarding specific timing (AN96040 - added to first post) and now I'm pretty sure that the interrupt signal may disturb data communication between PCF8584 and microcomputer subsystem. I'll cut /INT line from existing PCB (especially tha...

Hi, Generally it's look very good... (KiCAD)? Actually I see one issue... please clarify if I'm wrong. You are using the same CLK signal for 6502 and PCF? If yes, PCF will not be capable for so quick operations at all. Nice address decoder but in case you have many shadow registers :-). Did you conn...

Hi, I'm using MADS assembler as you guessed. The asterisk (*) with equ directive means that code started from i2cbuf should be placed in memory just here. It's dynamically allocation for i2cbuf. Another words, * is a pointer for memory address in the code stream. In case you have: ... 215 6115 00 le...

Hi, Today I'll show you how to prepare SONOFF S55FR Waterproof Wi-Fi Socket for Home Assistant under Tasmota environment. You may buy it on Banggood or Aliexpress, his price is abound 12$, so it's chip waterproof device in my opinion. socket0.jpeg Preparing to flash According to PCB variant which I ...

Hi, My prototype works fine with one condition.. touching I2C bus not so fast :-) So if you planning use full PCF8584 features consider to use external clock (e.g. 12MHz) for it. I'm used PHI2 clock - it was mistake. For more details see page: http://radio86rk.pbworks.com/w/page/134476563/rk86-2018-...

I need to equip my Home Assistant with storm detector so i found chip module GY-AS3935 made by CJMCU. It's very tiny but smart module with I2C and SPI interfaces. I Decide to use I2C with Wemos D1 mini under Tasmota. No more other staff was required... Prototype . storm_detector_prototype.jpg Actual...

TL866 II Plus is the good quality, cheeap and power IC programmer which I'm using very often as best tool for any kind of FLASH devices. Of course it will useless under Windows so I decided to find solution for my favourite Linux Mint. Well, uncle Google find Reversatronics blog: https://reversatro...

As said Wikidedia: PALASM is an early hardware description language, used to translate Boolean functions and state transition tables into a fuse map for use with Programmable Array Logic (PAL) devices introduced by Monolithic Memories, Inc. (MMI). The language was developed by John Birkner in the ea...

Done! The first project which is using VIAtari was made... I'm glad to present the first GLCD 162x64 connected to Atari: s1d15705blank.jpg s1d15705pcb.jpg In order to connect GLCD I used both parallel ports - PORTB is a data bus and PORTA is for control signals. Actually I used only 5 signals, so re...

Introduction Inspiration for this mode I found on Daryl's Computer Hobby Page . Daryl made Composite Video Text/Graphics Display based on ATMEGA8 and drive by VIA6522. This article will show how to build, assembly and connect VIA 6522 IC to Atari and use 2 additional 8-bit parallel ports and serial...