Editing Tandy 1000 (section)

===Tandy 1000 SL and TL series===
The Tandy SL and TL series of computers are updates of the SX and TX, respectively. In addition to offering redesigned cases, the machines offer a more integrated motherboard with improved graphics and sound capabilities while dropping composite video output. The graphics controller supports {{nowrap|640 × 200 × 16}} resolution as well as a [[Hercules Graphics Card]]-compatible, {{nowrap|720 × 350}} mode for monochrome monitors. Sound capabilities now include an 8-bit monaural DAC/ADC similar in function to [[parallel port]] sound devices (such as the [[Covox Speech Thing]] and [[Disney Sound Source]]) but extended to support DMA transfers, microphone input capability, and sampling rates up to 48&nbsp;kHz. The SL/TL allow the on-board floppy controller, parallel port and serial ports to be disabled, which the earlier models do not.

The SL and TL were shipped with MS-DOS 3.3 and [[DeskMate]] 3 in ROM, and feature a serial [[EEPROM]] memory chip to store BIOS settings. The machines can also run generic MS-DOS 3.x, 5.x, and 6.x and Windows 2.x and 3.0 operating systems, although Windows is limited to real-mode operations. In common with many PC clones of the era, MS-DOS 4 is problematic and generally avoided.

====1000 SL and SL/2====
[[File:SL Sound Satellite.JPG|thumb|right|The SL's sound/reset satellite board]]
The Tandy 1000 SL and SL/2 feature an [[Intel 8086]] processor running at 8&nbsp;MHz. This is socketed, and thus upgradeable with an [[NEC V30]].<ref name="Great Hierophant">{{cite web |title=Benefits and Drawbacks of the Late Model Tandy 1000s, CPU Upgradability |url=http://nerdlypleasures.blogspot.com/search?q=tandy+sl%2F2 |website=Nerdly Pleasures |publisher=Great Hierophant |access-date=May 13, 2019}}</ref> The SL comes with {{nowrap|384 KB}} of RAM preinstalled, whereas the SL/2 offers {{nowrap|512 KB}}. Both machines can be expanded to {{nowrap|640 KB}}, although the graphics controller reserves a portion of this memory, yielding only {{nowrap|608 KB}} to the operating system, even on systems using add-in ISA graphic cards. The SL line has the mic/earphone ports, volume knob, and reset button on a small satellite board. A jumper on the board allows the user to change the microphone input to a line-level output.<ref name="radioshacksupport">{{cite book | url=http://support.radioshack.com/support_computer/doc1/1262.htm | title=Tandy faxback document #1262 | access-date=September 6, 2014 | date=1995-04-26 }}</ref> The SL series offers five 8-bit XT-compatible ISA slots, and does not come with pre-installed [[real-time clock]] chips, making them optional upgrades in the form of the plug-in Dallas DS1216E SmartWatch.

The SL is the only machine in the line that offers an upper 5.25" bay, and therefore the only model to offer two 5.25" bays, where the other models, including the SL/2 and the entire TL range, feature two upper 3.5" bays and one lower 5.25" bay. As a result, fitting a hard drive to an SL that already has the upper and lower 5.25" bays populated may require either the removal of one of the devices in those bays, or the installation of a hard disk card-style bracket which seats in one of the ISA slots.

====1000 TL, TL/2 and TL/3====
The Tandy 1000 TL and TL/2 uses 8&nbsp;MHz Intel 80286 processors, whereas the TL/3 uses a 10&nbsp;MHz 80286. The TLs has 640&nbsp;KB of memory preinstalled, with an option for an extra 128&nbsp;KB for video frame buffering just as in the 1000 TX. Unlike the SL series machines, the TL series comes with the SmartWatch real-time clock logic built-in, which is powered by a removable 3-volt CR2032 button-cell battery on the motherboard.

The TL offers five 8-bit XT-compatible ISA slots, while the TL/2 and TL/3 offer four slots and an on-board 8-bit, XT IDE-compatible hard disk interface, which is not compatible with standard AT IDE hard drives. The TL series offers two upper 3.5" bays and one lower 5.25" bay, and the TL/3 has a high-density floppy drive controller for 1.44 MB drives, though it comes with a double-density 3.5" 720 KB drive.

As the processors on the TL-series are socketed, it is possible to install 386SX or Cyrix 486SLC-based processor upgrades, though the benefit of installing more advanced processors is limited beyond merely providing a speed increase due to the computers' XT-based architecture, and their resulting inability to access [[extended memory]] above 1 MB.<ref name="Great Hierophant"/>