http://www.sol-1.org/index.php

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Hello and Welcome. This is a website dedicated to a project of mine,
Sol-1. Sol-1 is a homebrew CPU and Minicomputer built from 74HC
logic.

Features

Hardware

- User and Kernel privilege modes, with up to 256 processes running
in parallel. - Paged virtual memory, such that each process can have
a total of 64KB RAM for itself. - Two serial ports (16550), a real
time clock(M48T02), 2 parallel ports(8255), a programmable timer
(8253), an IDE hard-drive interface(2.5 Inch HDD), and a soundboard
(AY-3-8910). - 8 prioritized external interrupts - DMA channel - The
sequencer is microcoded, with 15 ROMS operating horizontally - 8/
16-Bit MUL and DIV instructions - Fast indexed string instructions in
the spirit of x86's REP MOVSB, CMPSB, LODSB, STOSB, etc

Register Table

General Purpose Registers

| 16bit | 8bit  | Description
| ----- | ----- | -----------
| A     | AH/AL | Accumulator
| B     | BH/BL | Base Register (Secondary Counter Register)
| C     | CH/CL | Counter Register (Primary Counter)
| D     | DH/DL | Data Register / Data Pointer
| G     | GH/GL | General Register (For scratch)

Special Purpose Registers

| 16bit  |   8bit    | Description
| ------ | --------- | -----------
| PC     |           | Program Counter
| SP     |           | Stack Pointer
| SSP    |           | Supervisor Stack Pointer
| BP     |           | Base Pointer (Used to manage stack frames)
| SI     |           | Source Index (Source address for string operations)
| DI     |           | Destination Index (Destination address for string operations)
| PTB    |           | Page Table Base
| Status |           | CPU Status
| Flags  |           | Arithmetic and Logic flags register
| TDR    | TDRH/TDRL | Temporary Data Register (Internal CPU scratch register)

Software

* Unix-like operating system * Assembler * Full C compiler *
SystemVerilog model * Emulator * I plan to port the original Colossal
Cave adventure, as well as many other text-adventure games in the
near future.

Here is a demonstration session on Sol-1: [Screenshot] [Screenshot]
[Screenshot] [Screenshot] [Screenshot] [Screenshot] [Screenshot]
[Screenshot] [Screenshot] [Screenshot] [Screenshot]

Copyleft 2023 - Paulo Constantino