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The Monsputer is a Z80 computer developped with old chips (and some new) collected over the years. It has about 2M memory, clocks at 4.0MHz, has serial ports, 1 parallelport, 1 CAN bus, 2 SPI, 1 I2C, a RTC and other features. It supports interrupts mode 2 but not DMA.
DIY Arduino Boards for IO using port expanders and I2C
DIY Arduino Boards PCF8674 MCP23017 74HC595 CD4021
I2C
Parallel IO
Piezo buzzers
See the Files section for a wide range of sensors and sample code
Schematics
PCB Layout
Sample Code
Input/output (IO) C library exposing a common API for real mode and permission-restricted access to parallelport under Windows, Linux and MS-DOS operative systems. It also allows pin-by-pin port access.
Currently-under-development library of OS-independent objects to provide complex parallelport control, high-resolution timers and other similar facilities needed when using PC I/O ports to control external digital electronics.