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Sinclair QL
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=== Clones === {{Main articles|List of Sinclair QL clones}} After Amstrad abandoned the QL in 1986, several companies previously involved in the QL peripherals market stepped in to fill the void. These included [[Cambridge Systems Technology|CST]] and DanSoft, creators of the [[CST Thor|Thor]] line of compatible systems; [[Miracle Systems]], creator of the Gold Card and Super Gold Card processor/memory upgrade cards and the QXL PC-based hardware emulator; and Qubbesoft, with the Aurora, the first replacement QL mainboard, with enhanced graphics modes.<ref name="faq-hardware">{{ cite web | url = http://www.staff.uni-mainz.de/roklein/ql/Hardware | title = QL History FAQ: Hardware | first = Robert | last = Klein | access-date = 2008-04-21 | url-status = dead | archive-url = https://web.archive.org/web/20060504000555/http://www.staff.uni-mainz.de/roklein/ql/Hardware | archive-date = 2006-05-04 }}</ref> In the late 1990s, two partly QL-compatible [[motherboard]]s named Q40 and Q60 (collectively referred to as [[Qx0]]) were designed by Peter Graf and marketed by D&D Systems. The Q40 and Q60, based on the [[Motorola 68040]] and [[68060]] [[CPU]]s respectively, are much more powerful than the original QL and have the ability among other things (such as multimedia, high resolution graphics, [[Ethernet]] networking etc.) to run the [[Linux]] operating system.<ref>{{cite web | url = http://www.q40.de/ | title = Q40.de | access-date = 2008-04-21 }}</ref> In 2013 Peter Graf announced that he was working on the Q68, a FPGA based QL compatible single board computer. The Q68 was first presented to the public in April 2014 and became available in autumn 2017. It is produced and marketed by Derek Stewart (of former D&D Systems).<ref>{{ cite web | url = https://qlforum.co.uk/viewtopic.php?f=2&t=2203 | title = Q68 Order Process | first = Derek | last = Stewart | access-date = 2020-01-16 }}</ref> Hardware add-ons such as new developments like the QL-SD (designed by Peter Graf)<ref>{{ cite web | url = https://qlforum.co.uk/viewtopic.php?f=2&t=385 | title = QL-SD card project | first = Dilwyn | last = Jones | access-date = 2020-01-16 }}</ref> and reengineered or even expanded 1990s designs such as QubIDE interfaces (by José Leandro Novellón).<ref>{{ cite web | url = https://qlforum.co.uk/viewtopic.php?f=2&t=566 | title = QubIDE clone | author = José Leandro Novellón | access-date = 2020-01-16 }}</ref> Trump, Gold & Super Gold Cards (by Tetroid) are still being produced for the original QL.<ref>{{ cite web | url = https://qlforum.co.uk/viewtopic.php?f=2&t=1670 | title = Announcement - new QL Interface | author = RWAP | access-date = 2020-01-16 }}</ref> RWAP Software supplies various hardware and software upgrades and spare parts.
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