Editing Timex Sinclair 2068 (section)

==Technical specifications==
The T/S 2068 was a more sophisticated device, compared to its UK ancestor, the ZX Spectrum. Arguably one of the first Sinclair clones to significantly improve on the original design, it added a number of new features:
* an [[General Instrument AY-3-8910|AY-3-8912]] sound chip, as later used by Sinclair in the ''ZX Spectrum+ 128K'' (but mapped to different I/O ports and thus incompatible)
* twin [[joystick]] ports
* a slightly better "[[chiclet keyboard]]" with plastic keycaps
* a [[ROM cartridge|cartridge]] port to the right of the keyboard for ROM-based software{{r|byte198312}}
* Timex SCLD chip<ref name=":0" /><ref>{{Cite web |title=SCLD Chip |url=https://www.timexsinclair.com/product/scld-chip/ |access-date=2023-01-27 |website=Timex/Sinclair - The Authoritative Website for Timex/Sinclair Computers |language=en-US}}</ref><ref>{{Cite web |title=Scld in spectrusty::chip::scld - Rust |url=https://docs.rs/spectrusty/0.4.0/spectrusty/chip/scld/struct.Scld.html |access-date=2023-01-27 |website=docs.rs}}</ref> instead of the Spectrum's [[Gate array|ULA]], offering additional Extended Color, Dual Screen and High Resolution [[ZX Spectrum graphic modes|screen modes]]:
** Text: 32×24 characters (8×8 pixels, rendered in graphics mode)
** Graphics: 256×192 pixels, 15 colours (two simultaneous colours - "attributes" - per 8×8 pixels, causing [[attribute clash]])
** Extended Color: 256×192 pixels, 15 colors with colour resolution of 32×192 (two simultaneous colours - "attributes" -  per 8×1 pixels)
** Dual Screen: (two 256×192 pixels screens can be placed in memory)
** High Resolution: 512×192 mode with 2 colours (Four palettes: Black & White, Blue & Yellow, Red & Cyan, Magenta & Green).
* improved T/S 2000 BASIC, that extends [[Sinclair BASIC]] with new keywords to address new hardware and [[bank switching|bank-switched]] memory, allowing ROM cartridges to be mapped in.

However, these changes made the machine incompatible with most Spectrum [[machine code|machine-code]] software, which is to say virtually all commercial titles; less than 10% would run successfully.  In an attempt to remedy this, many TS users built a cartridge with a Spectrum ROM for emulation.

===T/S 2000 BASIC===
T/S 2000 BASIC<ref name="auto"/> was an extended version of [[Sinclair BASIC]], adding the following six keywords to the ordinary Sinclair BASIC ones:
*<code>DELETE</code> deletes BASIC program line ranges. {{keypress|CAPS&nbsp;SHIFT|0}} with the <code>K</code> cursor produces the command <code>DELETE</code>.
* <code>FREE</code> is a function that gives the amount of free RAM. <code>PRINT FREE</code> will show how much RAM is free.
* <code>ON ERR</code> is an [[error-handling]] function mostly used as <code>ON ERR GO TO</code> or <code>ON ERR CONT</code>.
* <code>RESET</code> can be used to reset the behaviour of <code>ON ERR</code>. It was also intended to reset peripherals.
* <code>SOUND</code> controls the AY-3-8192 sound chip.
* <code>STICK</code> is a function that gives the position of the internal joystick (Timex Sinclair 2090).