Table of Contents
ROM-MJS
Introduction
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.
Implementations
The following implementations are available:
| Implementation | Current Version | Date |
|---|---|---|
| ROM-MJS for Multicomp | 1.5.1 | 2016/1/4 |
Resources
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
