manan-gupta-16 / ao486_mister

ao486 port for MiSTer

ao486 port for MiSTer by Sorgelig.

Core was greatly reworked with many new features and performance added.

Features:

• 486DX33 performance (no-FPU).
• 256MB RAM
• SVGA with up to 1280x1024@256, 1024x768@64K, 640x480@16M resolutions
• SoundBlaster 2.0 with OPL3
• High speed UART (3Mbps) internet connection
• MIDI port (dumb and fake-smart modes)
• Dual HDD with up to 8GB each
• Shared folder support

How to install

• Copy ao486.rbf to root of SD card
• Create /ao486 directory on SD card and copy boot0.rom, boot1.rom there.
• For floppy: copy desired floppy raw image with extension img to ao486 directory.
• For HDD: create an empty file of desired size with extension vhd in ao486 directory (or prepare .vhd file separately with any tool supporting .vhd or hard disk .img files and copy to /ao486 folder)
• Boot ao486 and in OSD choose desired floppy, hdd and boot order
• Save settings and press "Reset and apply HDD"

HDD image is a raw image with MBR. It can be opened in Windows/Linux by many applications, so it's possible to prepare a HDD in windows/linux (in most cases you need to work with .img files, then just rename it to .vhd extension)

SoundBlaster settings:

• address: 220h
• IRQ: 5
• DMA: 1
• type SoundBlaster 2.0

MIDI settings:

• address: 330h
• IRQ: 9

Drivers

Windows 9x drivers for video and modem are here

Note:

• Press WIN+F12 to access OSD on ao486 core. F12 alone acts as generic F12 PC key.

Known issues

• FDD doesn't work under Win9x. To fix it simply delete floppy device from device manager and reboot. Windows will still provide flopy access through BIOS in compatibility mode.

Original core repository