Pico System Software

TUI Operating System for IBM PC or Compatible.

Pico System Font

0x00-0x1f: Application use
0x20-0xff: Common Font

Minimum Reqs

PC or Compatible
Floppy Drive
192 KiB RAM
EGA Video Card or Compatible

Features

Cooperative Multitask
Microkernel

Version History

Pico System v0.1
- Add Cothreads
- Add System Font
- Add Boot Loader Stage1/Stage2
- Add Minimal B++ Standard Library

Pico System ABI Specs

ABI Registers:

AX: Command ID
BX: Argument 0
CX: Argument 1
DX: Argument 2
SI: Argument 3

Interrupts

Format: COMMAND(ARGUMENTS,...)

INT 0x80: Task Yield
INT 0x81: Kernel
- 0x00(result_value): exit cothread,
- 0x01(code_seg, code_off, data_seg, stack_top): start new cothread