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https://github.com/ikskuh/pandoros
Another attempt to create a small operating system. This time, more features, less fancy code.
https://github.com/ikskuh/pandoros
Last synced: about 1 month ago
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Another attempt to create a small operating system. This time, more features, less fancy code.
- Host: GitHub
- URL: https://github.com/ikskuh/pandoros
- Owner: ikskuh
- Created: 2016-10-01T21:48:11.000Z (about 8 years ago)
- Default Branch: master
- Last Pushed: 2023-05-20T10:54:46.000Z (over 1 year ago)
- Last Synced: 2024-05-17T11:43:07.267Z (6 months ago)
- Language: C
- Size: 4.89 MB
- Stars: 3
- Watchers: 3
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
# PandorOS
Another attempt to create a small operating system. This time, more features, less fancy code.
## Concept
The whole OS is created with the OS of the [TI-83 Plus](https://en.wikipedia.org/wiki/TI-83_series#TI-83_Plus) in mind.
The feature list is simple: - **PandorOS Basic** Command Shell - Flat File System - `.PRG` Program Files - `.TXT` Text Files - `.DAT` Data Files (similar to a binary file) - File Editor for `.PRG` and `.TXT` files. - Command Catalog with in-system-help - Character Map for printing every possible character
## File System
PandorOS uses an In-RAM file system that allows the user to create programs and data files.
See [filesystem.md](filesystem.md) for more details.
## PandorOS Basic
The basic dialect of PandorOS. Quite restricted, quite simple.
### Expressions
PandorOS Basic supports all basic expression types:
| Expression | Example |
| --------------- | ---------- |
| Number | `10` |
| String | `"Name"` |
| Variable Access | `A` |
| Negation | `-A` |
| Parenthesis | `(A)` |
| Addition | `A + B` |
| Subtraction | `A - B` |
| Multiplication | `A * B` |
| Division | `A / B` |
| Logic And | `A And B` |
| Logic Or | `A Or B` |
| Logic Not | `Not A` |
| Function Call | `Mod(A,B)` |
### Variables
Pandoros Basic only supports 26 distinct numeric variables and 10 string variables:
| Variable | Type |
| --------------- | ------ |
| `A` - `Z` | Number |
| `Str0` - `Str9` | String |
### Assignments
Each expression returns a result that can be stored in a variable. An
assignment is a postfix operation where an arrow (`->`) is followed by
the variable name:
10 -> A
20 - A -> B
"Hello World!" -> Str0
### Functions
A function is a command that takes a list of arguments and returns a value.
It may be part of an expression.
Product(10, B, 20)
### Orders
An order is a special type of function that must be the first component of a
statement. It does not return any value and is separated from its argument list
by a whitespace character instead of brackets.
Disp 10, 20
### Example
> Current status allows no multiline program execution, only single-line statements.
> Also, no control structures are implemented.
Input "Enter Variable 1: ", A
Input "Enter Variable 2: ", B
A - B -> D
A / B -> Q
Print "Sum = ", A + B
Print "Difference = ", D
Print "Product = ", Product(A, B, 1)
Print "Quotient = ", Q
## Building
Requirements:
- re2c (https://re2c.org/)
- lemon (https://github.com/sqlite/sqlite/blob/master/tool/lemon.c + https://github.com/sqlite/sqlite/blob/master/tool/lempar.c)
- lua5
- mono + mcs
- clang
- syslinux
```sh-session
[user@host pandoros]$ make -C kernel
[user@host pandoros]$ qemu-system-x86_64 -kernel kernel/kernel -hda kernel/root.pfs
```