MIRAC Emulator

Program Ctr

Accumulator

Instruction

Argument Rg

ALU Operand

Address Bus

Data Bus In

DataBus Out

StackPointr

Gen.Purpose

Device Addr

Device Din

Device Dout

This is a JavaScript emulation of the
Minecraft Redstone Automatic Computer.

Documentation about the architecture, instruction set, assembly language and other topics:
Download (pdf, 42k).

Github Repository. Made by Roland Rytz.

MIDAS Assembly Input

starting at octal address

Memory

Oct Display

Docs

Dot Matrix

Docs

ASCII Display

Docs

Control

Cycle interval:

Set PC (octal):

Running at: (Paused)

Use animations:

Update values:

Flags

Carry	Zero	Overflow	Negative
0	0	0	0

Call Stack

Info: Octal Display

Octal Number Display

Address	Mode
020	Display single byte

Description

The octal display can display a single byte in base 8.
Use is simple: Write a single bite to device address 020.

Examples


							// write octal 123 to display
							

							PDAI
							020
							// set device address
							

							PDWI
							123
							// write immediate byte


							// write byte from memory address
							

							PDAI
							020
							// set device address
							

							PDWM
							100
							// write bite at memory location 100


							// write byte from accumulator
							

							// we're going to use the result of an addition
							

							LDAI
							20.
							// load decimal 20
							

							OPRA
							// write accumulator to operand register
							

							LDAI
							42.
							// load decimal 42
							

							ADDC
							// perform addition
							

							PDAI
							020
							// set device address
							

							PDWA
							// write addition result to display

Info: Dot Matrix

Dot Matrix Display

Address	Mode
030	Flip pixel at coordinates YYYY XXXX
031	Turn on pixel at coordinates YYYY XXXX
032	Turn off pixel at coordinates YYYY XXXX
033	Push byte to dot matrix, each byte controlling a pixel.
034	Fill matrix with pattern in pdout

Description

A 16x16 pixel monochrome dot matrix display.
There are various modes for controlling it, including manipulating single pixels, badge feeding entire bytes and filling the screen with a single-byte pattern.

Examples


							// Flip a pixel somewhere in the middle
							

							PDAI
							030
							

							PDWI
							#01011001
							// y = 5, x = 9


							// Turn on and then off the bottom left pixel
							

							pdai
							031
							

							pdwi
							#11110000
							// y = 15, x = 0
							

							pdai
							032
							

							pdwi
							#11110000


							// Fill in some pixels, starting from the top
							

							pdai
							033
							

							pdwi
							#10001000
							pdwi
							#10001000
							

							pdwi
							#11001100
							pdwi
							#11001100
							

							pdwi
							#10101010
							pdwi
							#10101010
							

							pdwi
							#11111111
							pdwi
							#11111111
							

							// Mode 033 is useful for displaying entire images


							// Blank screen
							

							pdai
							034
							

							pdwi
							#00000000

Info: ASCII Display

ASCII Text Display

Address	Mode
040	Set or replace character right of caret
041	Set or replace character at caret
042	Clear and reset

Description

A 10-character ASCII text display.
The display has an internal caret (cursor).
It increments if characters are written in mode 040. It wraps around when it reaches the last position.
Reset (Mode 042) resets the caret to position 0.

The character 127 (octal 177) acts as backspace.
It will clear the character at the caret, and decrement the caret position.

Examples


							// Write "Foo" at cursor
							

							pdai
							040
							

							pdwi
							'F'
							

							pdwi
							'o'
							

							pdwi
							'p'
							

							pdwi
							127.
							//127 is backspace
							

							pdwi
							'o'


							// Clear and reset
							

							pdai
							042
							

							pdwi
							000
							// Could be any value


							// Blinking cursor animation
							

							pdai
							041
							

							$loop:
							

							pdwi
							' '
							

							nope
							// for timing, because jmpi takes one tick
							

							pdwi
							'_'
							

							jmpi
							$loop

Program Ctr

Accumulator

Instruction

Argument Rg

ALU Operand

Address Bus

Data Bus In

DataBus Out

StackPointr

Gen.Purpose

Device Addr

Device Din

Device Dout

MIDAS Assembly Input Load example...

Memory

Oct Display

Dot Matrix

ASCII Display

Control

Flags

Call Stack

Info: Octal Display x

Octal Number Display

Description

Examples

Info: Dot Matrix x

Dot Matrix Display

Description

Examples

Info: ASCII Display x

ASCII Text Display

Description

Examples

Example Programs x

Bouncing Ball

Show Picture

Winking Owl

Visual Quine

String Loader

Stack demo

Error x

MIDAS Assembly Input

Info: Octal Display

Info: Dot Matrix

Info: ASCII Display

Example Programs

Error