Guides:MAME - Software - MS-DOS 6.22

Installing DOS 6.22 in MESS

Introduction

This guide will walk you through the process of getting MS-DOS running within the MAME ct486 machine. We'll cover off some of the specific tweaks required when installing DOS

For general information on the MESS project and how to use it including external references see the dedicated MESS Page

Prerequisites

• A CHD
• A copy of the MS-DOS 6.22 floppies.

Process

Having created a CHD to use you will now boot the ct486 driver with the hdd attached.

The ct486 driver doesn't have an auto configure HDD in the bios so you'll need to know your Cylinders, Heads and Sectors (CHS) values in relation to the CHD you are going to use. If you don't have the CHS information you can query the CHD image directly for this information, refer to the chdman Guide on how to do this.

Boot the ct486 machine with the hdd attached

$ ./mame64 ct486 -hard1 <chdname.chd>

On first boot you can expect the CMOS checksum to fail, the machine BIOS setup values will need to be entered.

Hit the F1 key on your keyboard to resume and enter the BIOS setup screen.

Under STANDARD CMOS SETUP configure the HDD and the FDD if not already configured

HDD: (This is where you need you CHS values from earlier) Type: 47=USER TYPE Cyln: <Cylinders> Head: <Heads> Sect: <Sectors>

Do not modify WPcom or LZone

Press ESC to exit this screen and select WRITE TO CMOS AND EXIT from the main menu, answer Y when prompted

Once this is done the first time MAME will create a nvram file on the hosts hard drive under nvram/ct486 which will maintain the configured state between machine boots.

For reference the md5 of the disks we use in this guide are

sha1sums