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Author Archives: Administrator
Sinclair QL – modifications for EPROM
I have Sinclair QL, “issue 5″ with 3 EPROM chips. One of the chips is riding on the other chip. And yes, it is the original solution from Sinclair engineers- they were pressed by Apple computers new product and they … Continue reading
Real easy Video fix for ZX Spectrum +2 (gray, “Toast Rack”)
I bought a ZX Spectrum +2 gray (toast rack) for my retrocomputer collection and it was the fail. The video output was bad and also there is a serious problem with RAM or ULA. But this article is about making … Continue reading
Printer from calculator, part 2
Continued from part 1. The printer from the calculator is a neat toy, but we want a real USB printer. So, using my new STM32F103 CubeMX USB printer class for communication with the host computer and some tricky INT based … Continue reading
Printer from calculator, part 1
In a pile of e-waste I found a printing calculator, Citizen CX-123II. It is a regular calculator (with some wicky calculations), but with a printer- all output from the screen are hard-copied to paper roll. It can print only numbers … Continue reading
ARM:0018 STM32CubeMX hack – printer class device
This article is about printer class device for STM32F103 and STM32CubeMX. Somehow there is NO printer device class example in whole internet. There ar CDC or HID examples copied from same STM32CubeMX example with minimal explanation, few of mass storage … Continue reading
Cutting PCB panels for new universal STM board
I’ve noticed, that Chinese made “Blue Pill” PCB has fake chips. Some chips are with smaller ROM and RAM size, some chips behaves a bit strange. Also, several mine projects are getting bigger and bigger. Recently, I acquired several bigger … Continue reading
Crazy ’80s – computer design with style
When I hear somebody talking that Apple is the pioneer in the computer design, I always want to show photo of Atari XL series: These ones are not the all, they are only ones from my personal collection. Remember, it … Continue reading
Capacitive soil moisture sensor – designed by retarded
There is a cheap, made in China product called “capacitive soil moisture sensor”. Some black PCB with few components and no coating: There are lots of “duino” projects for this sensor. But there are lots of comments about this sensor … Continue reading
ARM:0017 – go to sleep clock
This is a “gamers” clock. It sits near the monitor and shows the real time and time computer is on. This is achieved using USB as power supply. Also, the same USB port is used to set the clock. Battery … Continue reading
ARM:0016 STM32CubeMX – problems with RTC
This is a very short message about proper initialization of RTC (real time clock). There is one trick designed in HAL and in several internet resources it is wrongly described. Proper RTC init: Find “MX_RTC_Init(void)“, scroll to “USER CODE BEGIN … Continue reading