Editing Tandy 1000 (section)

=== I/O and ports ===
Tandy 1000, SX, and TX use a proprietary 8-pin round DIN connector for the keyboard port that is compatible with the older TRS computers but not compatible with the [[IBM Personal Computer/AT|IBM PC/AT]] or PS/2 standard. Some scan codes differ between the Tandy 1000 and IBM PC/XT and AT, resulting in software compatibility issues. The SL/TL and later use a more directly PC/XT-compatible keyboard protocol, and the 1000 RSX uses a PC/AT and PS/2-compatible protocol.

Tandy 1000 uses a proprietary 6-pin female round connector for the joystick port that on the SX/TX is adjacent to the keyboard port in the front of the computer. It is compatible with Color Computer joysticks, but not compatible with the IBM standard 15-pin male game port. Some DOS games do not work with these joystick ports, but those that support Tandy 1000 graphics and sound work.

Early Tandy 1000 models use the TRS-80 card-edge parallel printer port rather than industry standard DB-25 printer port, requiring a compatible printer cable to connect to a standard printer parallel port. This was later changed to a standard DB-25 connector on the 1000 RL.

Tandy 1000TX and beyond use a proprietary floppy drive cable port, that also powers the floppy drive. It requires a Tandy 1000-compatible floppy drive, though it may be possible to modify a floppy drive cable to make a standard floppy drive work.