Miracle Systems Ltd. were a manufacturer of personal computer

Personal computer

A personal computer is any general-purpose computer whose size, capabilities, and original sales price make it useful for individuals, and which is intended to be operated directly by an end-user with no intervening computer operator...

 peripherals and upgrades, specializing in the Sinclair QL

Sinclair QL

The Sinclair QL , was a personal computer launched by Sinclair Research in 1984, as the successor to the Sinclair ZX Spectrum...

, in the 1980s and early 1990s.

The company was incorporated in February 1983. Initially, they produced simple peripherals such as an RS-232

RS-232

In telecommunications, RS-232 is the traditional name for a series of standards for serial binary single-ended data and control signals connecting between a DTE and a DCE . It is commonly used in computer serial ports...

 to Centronics

Centronics

Centronics Data Computer Corporation was a pioneering American manufacturer of computer printers, now remembered primarily for the parallel interface that bears its name.-The beginning:Centronics began as a division of Wang Laboratories...

 parallel printer interface adapter. Later, they designed the Expanderam series of RAM

Ram

-Animals:*Ram, an uncastrated male sheep*Ram cichlid, a species of freshwater fish endemic to Colombia and Venezuela-Military:*Battering ram*Ramming, a military tactic in which one vehicle runs into another...

 expansion cards for the QL, which lead to the Trump Card combined RAM expansion and floppy disk

Floppy disk

A floppy disk is a disk storage medium composed of a disk of thin and flexible magnetic storage medium, sealed in a rectangular plastic carrier lined with fabric that removes dust particles...

 interface. This was notable in that it mapped RAM into memory space reserved for external peripheral devices, thus allowing the QL's RAM to be expanded to 768 kB rather than the official limit of 512 kB.

The Trump Card was later superseded by the Gold Card processor upgrade card. This replaced the QL's 68008

Motorola 68008

The Motorola 68008 is an 8/16/32-bit microprocessor made by Motorola. It is a version of the Motorola 68000 with an 8-bit external data bus, as well as a smaller address bus.The original 68000 had a 24-bit address bus and a 16-bit data bus...

 CPU with a 16 MHz 68000

Motorola 68000

The Motorola 68000 is a 16/32-bit CISC microprocessor core designed and marketed by Freescale Semiconductor...

 and included 2 MB of RAM, a floppy disk interface (supporting DD, HD, and ED density 3.5 in drives) and a non-volatile real-time clock. Gold Card plugged into the QL expansion slot and required no internal modifications to the host QL.

The follow-up Super Gold Card had a 24 MHz 68020

Motorola 68020

The Motorola 68020 is a 32-bit microprocessor from Motorola, released in 1984. It is the successor to the Motorola 68010 and is succeeded by the Motorola 68030...

 CPU, 4MB of RAM, and added a Centronics parallel printer interface.

In 1993, Miracle launched the QXL QL emulator card for PC

IBM PC compatible

IBM PC compatible computers are those generally similar to the original IBM PC, XT, and AT. Such computers used to be referred to as PC clones, or IBM clones since they almost exactly duplicated all the significant features of the PC architecture, facilitated by various manufacturers' ability to...

s. This comprised a 20 MHz (later 25 MHz) 68EC040 processor, up to 8 MB of RAM and an FPGA on an ISA

Industry Standard Architecture

Industry Standard Architecture is a computer bus standard for IBM PC compatible computers introduced with the IBM Personal Computer to support its Intel 8088 microprocessor's 8-bit external data bus and extended to 16 bits for the IBM Personal Computer/AT's Intel 80286 processor...

 card. The QXL ran the SMSQ

SMSQ/E

SMSQ/E is a computer operating system originally developed in France by Tony Tebby, the designer of the original QDOS operating system for the Sinclair QL personal computer. It began life as SMSQ, a QDOS-compatible version of SMS2 intended for the Miracle Systems QXL emulator card for PCs. This was...

 Qdos

Sinclair QDOS

QDOS is the multitasking operating system found on the Sinclair QL personal computer and its clones...

-compatible operating system

Operating system

An operating system is a set of programs that manage computer hardware resources and provide common services for application software. The operating system is the most important type of system software in a computer system...

 and used the host PC's disks, screen, keyboard, serial and parallel ports via an MS-DOS

MS-DOS

MS-DOS is an operating system for x86-based personal computers. It was the most commonly used member of the DOS family of operating systems, and was the main operating system for IBM PC compatible personal computers during the 1980s to the mid 1990s, until it was gradually superseded by operating...

"server". Two QLAN-compatible network ports were also provided on the QXL card.

The company was finally wound up in August 2004.