The TX had a 3.5" internal floppy disk drive mounted in a 5.25" bay with room for an optional second internal 3.5" or 5.25" floppy disk drive. The rear panel had the same ports as the 1000 SX, except that an RS-232C serial port replaced the light-pen port. The memory size was 640 KB, with sockets for an additional 128 KB devoted to the onboard video logic. This extra 128 KB could only be used for and by the on-board video controller, so it was impractical to expand the on-board memory beyond 640 KB if a VGA graphics card was installed. The computer came bundled with Personal DeskMate 2.