Editing Tandy 1000 (section)

====1000 SX====
The Tandy 1000 SX uses a 7.16&nbsp;MHz 8088-2 processor, has 384&nbsp;KB of memory (upgradeable to 640&nbsp;KB on the motherboard), comes with either one or two 5.25" internal floppy disk drives, and has the light pen port (not a serial port) like the original Tandy 1000.<ref>{{Cite news |last=Reynolds |first=Mark |date=August 1987 |title=The Tandy 1000 SX |pages=33 |work=80 Micro |url=https://archive.org/details/80-microcomputing-magazine-1987-08/page/n33/mode/2up}}</ref> An adjustable potentiometer inside the system controls the volume of the internal speaker. The Tandy AX is an SX rebadged for sale in [[Walmart]] stores. The 1000 SX comes with MS-DOS 3.2 and DeskMate II on 5.25" 360&nbsp;KB diskettes.

The SX is the first Tandy 1000 in which the built-in video circuitry can be disabled via the installation of an upgraded graphics card, typically an [[Enhanced Graphics Adapter|EGA]] or [[Video Graphics Array|VGA card]], in an expansion slot.