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          o Arduino
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          o ISA Card LCD Screen
          o 8088 Mother Board Project
          o 8088 PC Compatible
          o V40 Motherboard Project

www.homebrew8088.com

  * Home
      + 28C256 EEPROM Writer
      + Raspberry PI Second Project
      + 
        Archived Pages
          o Arduino
          o Raspberry Pi
          o Programming
          o ISA Card LCD Screen
          o 8088 Mother Board Project
          o 8088 PC Compatible
          o V40 Motherboard Project
  * More
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          o 28C256 EEPROM Writer
          o Raspberry PI Second Project
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            Archived Pages
              # Arduino
              # Raspberry Pi
              # Programming
              # ISA Card LCD Screen
              # 8088 Mother Board Project
              # 8088 PC Compatible
              # V40 Motherboard Project

Raspberry PI PCB

Home

28C256 32k EEPROM Writer

Raspberry PI PCB

email: info@homebrew8088.com

The code is fairly simple and easy to modify. Basically the Raspberry
PI toggles the Clock then reads the Control Bus and then provides the
8088 what it is requesting. It will read the ALE pin and save the
address then provide the proper Memory or IO Read/Write.

Disadvantages:

  * The speed, the processor is only running at about 0.3 MHz the
    best I could calculate. But on the flip side the drive read
    writes are very fast because the memory is virtual on raspberry
    pi.

  * Not all 8088/8086 Processors will work. The power is connected to
    the 3.3v pin on the PI. Most NEC V20/V30's will operate 3V - 7V
    so this is not problem.


I have written a c library that helps with interfacing the 8088 PCB.
I have also begun to develop a GUI window that emulates CGA/VGA
graphics

GitHub

https://github.com/homebrew8088/pi86

-I tested this with a fresh install of Raspberry PI os and it ran
just fine.

-To compile I had to install the SDL library.

sudo apt-get update

sudo apt-get upgrade

sudo apt-get install gcc build-essential libsdl2-dev

-To compile the bios file install nasm

sudo apt-get install nasm

*** This is experimental use at your own risk.

This current build runs very stable. I have left it running for
seveal hours and came back and it was still running just fine. I
encourage you to download the source code to the projects and give
them a try and make modification.

 
My Bios currently supports the follow interrupts

INT10: Video, Limited Functions

AH = 0X00 Set Video Mode 0-4

AH = 0X02 Set Cursor Position

AH = 0X05 Select Active Display Page

AH = 0X09 Write Character and Attribute at Cursor Position, Not in
mode 4

AH = 0X0B Set Palette CGA

AH = 0x0E Teletype

AH = 0X0F Get Current Mode

INT 0x11 Equipment Check

INT 0x12 Memory

INT 0x13 Drives, Limited Functions

AH = 0X00 Reset Disk System

AH = 0X01 Get Status of Last Operation

AH = 0X02 Read Disk

AH = 0X03 Write Disk

AH = 0X08 Disk Parameters

AH = 0X15 Get Disk Type

INT 0x15 Cassette Returns Not Present

INT 0x16 Keyboard

AH = 0X00 Wait For Key

AH = 0X01 Check For Key 

AH = 0X02 Get Shift Flags, Limited

INT 0x19 Jump to Bootstrap

INT 0x1A Time


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