Short answers, pulled from the story.
The first model known as the Amiga 1000 was announced in 1985 with machines offered for sale starting in August. Quantity production began in mid-November causing the product to miss the Christmas buying rush entirely.
Jay Miner led development of the Television Interface Adaptor and his team created sophisticated chips like CTIA, ANTIC, and POKEY that formed the basis of the Atari 8-bit computers before founding Hi-Toro. The Amiga custom chipset consisted of several coprocessors handling audio video and direct memory access independently from the central processing unit.
Total reported sales through 1986 reached 120,000 machines after bad marketing and stability issues limited early 1986 monthly sales to between 10,000 and 15,000 units. By year-end sales had reached 35,000 units before severe cashflow problems forced withdrawal from the January 1986 Consumer Electronics Show.
Commodore shut down the Amiga division on the 26th of April 1994 and filed for bankruptcy three days later. Assets were purchased by Escom German PC manufacturer who created subsidiary company Amiga Technologies.
AmigaOS became one of first commercially available consumer operating systems implementing preemptive multitasking introduced in 1985 with the Amiga 1000. Multi-tasking kernel named Exec acted as scheduler providing prioritized round-robin scheduling enabling true pre-emptive multitasking within 256 KB free memory.