8088 Mother Board Project
The Mother Board
This project is focused on creating a completely modular system to allow the user to customize their system with the features they want.
The Mother Board features
8 MHz Clock
Configured in Minimum mode
Interrupt disable jumpers
8 pin headers to plug in the system memory and IO devices.
Full 1MB Used for prototyping on the 8088.
2 - 512K ram
The EEPROM is build around is a 5 volt byte alterable EEPROM. This means that you can write to it as if it was RAM sort of. So to protect your code and life of the chip I have included a write protect feature. You upload your code with the SPI adapter, then you can remove the adapter and run the mother board as a stand alone project.
This will only be needed if your wanting to run your project independent of an SPI device (Raspberry Pi, Arduino ). When and if I create a USB card and Video card you can burn your bios to a Rom and eliminate the need to always have the SPI Adapter and SPI master computer.
2 - 32K Sockets, You can mix and match. 32K ROM/32K RAM or 64 KROM
Write Protect Enable/Disable jumper.
Address 0xF0000 / 0XF8000
This is used to interface with the project from a SPI master. Currently can upload code from Arduino or Raspberry PI. The system is capable of booting DOS using a Raspberry PI. The RPI acts as the Video, Keyboard, Timer, and Drives.
Hold system bus
Resest the system
Read/Write the full 1MB of the 8088's Ram
Read/Write all 64K of the 8088's IO ports
Future uses ............. Writes to the 8088 Rom
Connecting the SPI Adapter to Raspberry PI
SCLK - GPIO 11 Pin 23 connects to SCK
CE0 - GPIO 8 Pin 24 connects to CS
MOSI - GPIO 10 Pin 19 connects to SI
MISO - GPIO 9 Pin 21 connects to SO
Any Ground Pin connects to GND
Pin 2 – 5+ if you are powering the 8088 PCB with the Raspberry PI
Connecting the SPI Adapter to Arduino
SS – digital 10 connects to CS
MOSI – digital 11 connects to SI
MISO – digital 12 connects to SO
SCK – digital 13 connects to SCK
GND's are connected
5+ if you are powering the 8088 PCB with the Arduino
Programmable Peripheral Interface 8255/71055
Address 0x0378 or Address 0x0278 (all 16 address are lines fully decoded)
3 - 8bit ports (24 IO pins)
Programming Interrupter Controller 8259/71059
8 IRQ pins
Address 0x0020 (all 16 address are lines fully decoded)