https://github.com/humbertocsjr/br-ux-z80

*nix-like Operating System for Z80 (MSX1)
https://github.com/humbertocsjr/br-ux-z80

msx msx-computers osdev unix unix-like-os

Last synced: about 1 month ago
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*nix-like Operating System for Z80 (MSX1)

• Host: GitHub
• URL: https://github.com/humbertocsjr/br-ux-z80
• Owner: humbertocsjr
• License: other
• Created: 2024-12-15T23:25:43.000Z (about 1 month ago)
• Default Branch: main
• Last Pushed: 2024-12-15T23:49:12.000Z (about 1 month ago)
• Last Synced: 2024-12-16T00:23:59.016Z (about 1 month ago)
• Topics: msx, msx-computers, osdev, unix, unix-like-os
• Language: C
• Homepage:
• Size: 0 Bytes
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: readme.md
  • License: license

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README

        
# BR-UX - Brazillian Unique *nix-Like Operating System

**Disclaimer:** The colors and name of the project are solely linked to the country and not to political spectrum or ideology.

# Versioning

Inpired on HP-UX Versioning System:

[Version][Edition] v[Version].[Sub version] B[Sub version][Revision]

- Version: Number

- Edition: 

    - a: Alpha

    - b: Beta

    - z: Production

- Sub version: 1 Digit Number

- Revision: 2 Hex Digits Number

**Examples.:**

- 1a v1.1 R100

- 4b v4.5 R532

- 2z v2.1 R1f4

# BrFS - Brazilian File System

Simplified File System with partial POSIX Support.

Block ID is the block position in disk.

The first 6 blocks of the disk are not indexed, and are reserved for the Boot Loader, with Root positioned in block ID 6.

# Modes

Directory Mode    = 0x41ff

Regular File Mode = 0x81ff

Data Block Mode   = 0x0000

# Date Time Format

| Size | Description |

|------|-------------|

|    2 | Year        |

|    1 | Month       |

|    1 | Day         |

|    1 | Hour        |

|    1 | Minute      |

|    1 | Second      |

|    1 | Centisecond |

# Item Block Format

| Size | Description            |

|------|------------------------|

|   64 | Item Name              |

|    2 | Always Zero            |

|    2 | User ID                |

|    2 | Group ID               |

|    2 | Creation User ID       |

|    8 | Creation Date Time     |

|    8 | Modification Date Time |

|  412 | Reserved               |

|    2 | Block ID               |

|    2 | Mode                   |

|    2 | Next ID                |

|    2 | First Child ID         |

|    2 | Parent ID              |

|    2 | Data Size              |

# Root Block Format

| Size | Description            |

|------|------------------------|

|   64 | Item Name              |

|    2 | Always Zero            |

|    2 | User ID                |

|    2 | Group ID               |

|    2 | Creation User ID       |

|    8 | Creation Date Time     |

|    8 | Modification Date Time |

|  412 | Reserved               |

|    2 | Block ID               |

|    2 | Mode                   |

|    2 | Last Disk Block ID     |

|    2 | First Child ID         |

|    2 | Zero                   |

|    2 | Total Disk Blocks      |

# Data Block Format

| Size | Description       |

|------|-------------------|

|  500 | Raw Data          |

|    2 | Block ID          |

|    2 | Mode              |

|    2 | Next ID           |

|    2 | First Child ID    |

|    2 | Parent ID         |

|    2 | Data Size         |

# Target | MSX 1

This version aims to support the base model of the MSX 1.

## Minimum Requirements

- MSX 1 Machine or Compatible

- 16 KiB RAM

- 720 KiB Floppy Drive

- MegaRAM 256 KiB

## MegaRAM Layout

| Page | Description |

|------|-------------|

|    0 | Kernel Data |

|    1 | Kernel      |

## RAM Layout

| Segment | Description |

|---------|-------------|

| 0x0000  | BIOS        |

| 0x4000  | Application |

| 0x6000  | Data        |

| 0x8000  | Stack       |

| 0xa000  | Kernel Data |

| 0xc000  | Kernel      |