Editing List of ZX Spectrum clones (section)

==== Felix HC series ====
'''Felix HC''' are a series of ZX Spectrum clones manufactured in Romania from 1985 to 1994 by ICE Felix.<ref>{{Cite web|url=http://zx.interface1.net/clones/hc85.html|title=Sinclair Nostalgia Products - Sinclair Clones - Felix HC 85, HC 90, HC 91|website=zx.interface1.net}}</ref> The '''HC''' designation stands for '''Home Computer''', and for the first four models in the series, the number indicates the year of first manufacture. Models in the series were: '''HC 85''', '''HC 88''', '''HC 90''', '''HC 91''', '''HC91+''' ('''HC128'''), [[:ro:HC#HC 2000|'''HC 2000''']]<ref>{{Cite web|url=https://www.sinclaircollection.site/?page_id=508|title=ICE Felix HC 2000 – Sinclair Collection Site}}</ref> and '''HC386'''.

The earliest version ('''HC 85''') closely resembled the Spectrum, with a built-in [[BASIC]] interpreter, Z80A processor, 48&nbsp;KB RAM, tape, and TV interfaces.<ref>[http://www.csit-sun.pub.ro/research/history/HC%2085.pdf Microcalculatorul personal HC-85.], Authors: A. Petrescu, F. Iacob, T. Domocos, T. Mihu, E. Dobrovie</ref> It was used in schools/universities, and as a personal computer.

An optional Interface 1 expansion was available for the HC 85, HC 90, and HC 91. It was functionally similar to the [[ZX Interface 1]], but instead of Microdrives it supported single-density or double-density floppy disks.

The '''HC 90''' had a redesigned circuit board supporting fewer, larger memory chips; it was functionally equivalent to the HC 85.

The '''HC 91''' had a modified keyboard with 50 keys instead of 40. It had 64&nbsp;KB RAM, and extra circuitry which provided [[CP/M]] support if the Interface 1 expansion was also present.

The '''HC 2000''' (manufactured from 1992 to 1994) had a built-in 3.5-inch 720&nbsp;KB floppy disk drive, and 64&nbsp;KB RAM. It could be used both as a Spectrum clone with added disk functionality (only 48&nbsp;KB RAM available) or in CP/M mode, giving access to the full 64&nbsp;KB memory. Essentially, it consolidated the HC 91, Interface 1, and floppy disk drive into a single case.

The last model to be made in the Z80 line was the '''HC91+'''. It was a ZX Spectrum 128K clone in a HC91 case and keyboard, and had some compatibility problems. For the first time, the AY-8910 sound chip was offered as an add-on service, and was soldered on the board by factory technicians. [[Demoscene]] demos had problems running multi-colour effects, and displaying sound VU meter-like effects, through lack of data in the AY chip.
<gallery>
File:HC 85 - 01.JPG|HC 85
File:HC85 extended.jpg|HC85+
</gallery>