SF-7000 was designed to expand SEGA SC-3000 computer mainly with a Floppy Disk drives which can read Compact Floppy Disk of 3".

This kind of Floppy Diks Drive was supposed to substitute the old 5,25" floppy disk drives more popular in eighties.

Several 8bit systems, such as Amstrad and Sinclair, could have their 3" Floppy Disk Drive, but soon it was replaced by the 3.5", which still exists nowadays.

This 3" disk inherited the features of a 5.25" one: the index hole, the possibility to read/write on both sides, but it gave more space for data.

SF-7000 has an RS-232C built in standart serial interface, which let you plug your SEGA to modem, different devices and also other computers that use this interface. You can reach the speed from 300 to 9600 baud, which for that era was a great speed.

By default the speed is set to 300 baud on PCB with a jumper, but it's easy to change it .

It is possible also to connect SF-7000 to any computer with a serial port (as for exaple a PC) and exchange data from/to each other.

SEGA decided also to include a Centronics standard parallel port, still used in many computers nowadays, including PC. This port was fundamental to use many 80 column printers which were never released by SEGA.

Unfortunately in those years was more popular the 7+7 pin plug instead of the 18+18 pin, more popular nowadays on parallel port printers.

SF-7000 has 64KBytes built in memory bank, which is filled with data read fron the floppy disk. When you use the SEGA Disk Basic, usually 18K are free for BASIC programming, but it is possible to load cartridges dump data stored on disks.

This was a great feature for a computer because it was possible to create special version of cartridges to use with new peripherals like RS-232C or the Centronics Printer.