fitting over it. Ability to synchronize the video timings with an external device so that a video Genlock device can be used without having to make any modifications to computer's hardware Analogue joypad ports (2), with support for devices such as paddles and light pens in addition to joysticks/joypads. The Atari Jaguar joypads and Power Pad joypads (gray version of Jaguar joypads marketed for the STE and Falcon) can be used without an adapter. Two standard Atari-style digital joysticks could be plugged into each analogue port with an adapter. TOS 1.06 (also known as TOS 1.6) or TOS 1.62 (which fixed some major backwards-compatibility bugs in TOS 1.6) in two socketed 128 KB ROM chips. Socketed PLCC 68000 CPU Models The members of the ST family are listed below, in roughly chronological order: 520ST Original model with 512 KB RAM, external power supply, no floppy disk drive. The early models had only a bootstrap ROM and TOS had to be loaded from disk. 520ST+ early 520STs with 1 MB of RAM, but without floppy disk 260ST originally intended to be a 256 KB variant, but actually sold in small quantities in Europe with 512 KB. Used after the release of the 520ST+ to differentiate the cheaper 512 KB models from the 1 MB models. Because the early 520STs were sold with TOS on disk, which used up 192 KB of RAM, the machine only had around 256 KB left. 520STM a 520ST with a built-in modulator for TV output and 512 KB RAM. 520STFM a 520STM with a redesigned motherboard in a larger case with a built-in floppy disk drive (in some cases a single-sided drive only), and 512 KB RAM. 1040STF a 520STFM with 1 MB of RAM and a built-in double-sided floppy disk drive, but without RF modulator 1040STFM a 520STFM with 1 MB of RAM and a built-in double-sided floppy disk drive with RF modulator Mega ST (MEGA 1, MEGA 2, MEGA 4) redesigned motherboard with 1, 2 or 4 MB of RAM, respectively, in a much improved "pizza box" case with a detached keyboard. All MEGA mainboards have a PLCC socket for the BLiTTER chip and some early models did not include the BLiTTER chip. They also included a real-time clock and internal expansion connector. Some early MEGA 2 had a MEGA 4 mainboard with half of the memory chip places unpopulated and the MEGA 2