Spectravideo's first real computers were the SV-318 and SV-328, released in 1983. Both were powered by a Z80 A at 3.6 MHz, but differed in the amount of RAM (SV-318 had 32KB and SV-328 had 80KB total, of which 16KB was reserved for video) and keyboard style. The main operating system, residing in ROM, was a version of Microsoft Extended BASIC, but if the computer was equipped with a floppy drive, the user had the option to boot with CP/M instead. These two computers were precedent to MSX and not fully compatible with the standard, though the changes made to their design to create MSX were minor. The system had a wide range of optional hardware, for example an adapter making it possible to run ColecoVision games on the SVI.