Atari 130ST 16 bit computer
The Atari 130ST was never released, it was built purely as a prototype to show off the competition at the Las Vegas Consumer Electronics Show, and was never productionalized.The machine came with 256KByte of memory, but due to the large need of the OS (192KByte) and the memory need of the enhanced graphics, only 64KByte of free RAM was left.
The Graphical User Interface and the new TOS operating system were not fully functional at the time of the show, but there was enough to impress the press and the competition. This machine was the ticket for Atari to enter into the fray of 16-bit computers, and the ST line became a popular line of computers among consumers.
Atari ST - Brief History
At the Winter Las Vegas Consumer Electronics Show of 1985, the Atari 130ST was introduced. ST stands for Sixteen bit data-bus and Thirty-two address-bus. Atari, after it was bought by Jack Tramiel, originally had contracted the Amiga Corporation to manufacture a 16-bit computer, but the contract was dissolved due to legal issues. Atari then rushed to get a machine out to compete with the release of the Comodore Amiga.
The Atari ST line came with many new features over previous Atari computers:
- 16 bit processor, 68000 CPU
- Midi Interface
- Graphical User Interface OS
- High graphics resulution in color
The new ST systems came with several dedicated coprocessors that enabled enhanced sound, graphics and memory management:
- MFP 68901 - Interrupt handler
- Yamaha YM 2149 - Programable Sound Generator (AY-3-8910 compatible)
- Shifter - Custom video processor
- GLUE - Custom Memory Manager (MMU)
The Atari130 was a demonstration only prototype, and never released. Due to it's small memory size, the OS did not function properly and the machine was quickly replaced with the Atari 260ST. This computer came with 512KByte of memory, but due to the large need of the OS (192KByte) and the memory need of the enhanced graphics, only 64KByte of free RAM was left.
The new operating system was called TOS, the Tramiel Operating System. The OS was basically a port of CP/M for the 68000 processor. Also interesting is that the high level TOS calls, called GemDOS, were all compatible with the DOS calls for the PC (DOS INT21h calls).
The GUI was called GEM, which stands for Graphical Environment Mamnager. The OS was provided on disk for the early ST models, which limited the free RAM left, and later it was baked into 6 32KByte ROM chips when the OS was fully finished.