![]() A jumper on the board allowed the user to change the microphone input to a line output. The SL line had the mic/earphone ports, volume rocker, and reset button on a small satellite board. Both machines were expandable to 640 KB, although the graphics controller reserved some of this memory, leaving only 608 KB available for the operating system, even on systems using ISA graphics cards. The SL came with 384 KB of RAM preinstalled, while the SL/2 offered 512 KB. It has a socket so can be upgraded with a NEC V30. The Tandy 1000 SL and SL/2 have an Intel 8086 processor running at 8 MHz. As with many PC clones of the time, MS-DOS 4 was problematic and generally avoided. The machines could also run 'normal' MS-DOS 3.x, 5.x and 6.x and Windows 2.x and 3.0 operating systems, although Windows was limited to real-mode operations. The SL and TL also shipped with MS-DOS 3.3 and DeskMate 3 in ROM, and had a serial EEPROM memory chip to store BIOS settings. The SL/TL lines allowed the built-in floppy controller, parallel port and serial ports to be disabled, which was not the case with previous models. Sound capabilities now include an 8-bit mono DAC/ADC, which was similar in function to parallel port audio devices (such as the Covox Speech Thing and Disney Sound Source), but expanded to support DMA transfer, microphone input and sampling rates up to 48 kHz.
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