Original URL : https://retrobrewcomputers.org/doku.php?id=software:firmwareos:rom-mjs:start
 Snapshot date: 2025-04-28
 Generator    : wayback-archiver

ROM-MJS

Introduction

Implementations

Resources

ROM-MJS is a suite of programs designed for Z80 based systems to assist in debugging hardware and installing CP/M software.

Included in the package are the following applications:

Basic debug monitor. Designed for small ROM environments. Includes some basic diagnostic testing of hardware and code to load a boot file from disk.

Extended debug monitor. Designed for hardware debugging and software installation. Supports booting an operating system image stored on a disk partition.

BIOS and XIOS for CP/M (2.2 and 3) as well as MP/M.

Utility programs for managing CP/M disk partitions, copying files from a FAT volume and installing boot code to a partition.

Depending on the available ROM in the system, the Basic or Extended Monitor is loaded into ROM and executed at reset/power-on.

The basic monitor is capable of loading the Extended Monitor from disk if required.

ROM-MJS supports PC style partitions (MBR) allowing the use of up to 4 PRIMARY partitions. Disks can be partitioned using any disk partitioning software providing that the partitions created are PRIMARY partitions and of type 0x52 (CP/M). CP/M partitions can be 8MB or larger. However, currently the BIOS and XIOS only support 8MB disks.

The extended monitor supports READ-Only access to a FAT16 or FAT32 partition and can load files into RAM, copy disk images directly to disk (sector copy) and run utility applications without booting CP/M.

The various hardware drivers are combined into a Hardware Access Layer which provides a standard API for the monitor as well as the CP/M 2 BIOS to access. This allows a system disk to be moved between multiple systems and booted without needing a different BIOS for differing hardware. Some CP/M utilities talk directly to the Hardware Access Layer to manipulate the environment underneath the operating system.

The following implementations are available:

Documentation:

Filename

Filesize

Last modified

cpm2-install_guide.pdf

54.0 KiB

2015/12/16 16:09

disk_preparation_guide.pdf

1.1 MiB

2015/12/16 05:04

rom-mjs_utility_guide.pdf

125.0 KiB

2016/07/19 07:53

setting_up_auto_boot.pdf

444.7 KiB

2015/12/28 18:59

Cross Platform Software Images:

Filename

Filesize

Last modified

cpm2-img.bin

168.2 KiB

2016/01/04 01:38

Note: The CP/M 2.2 image is a universal image and will boot on any ROM-MJS implementation