
The SGI Indigo was a line of computer workstations manufactured by SGI beginning in 1990. The initial Indigo (codename Hollywood) was based on the IP12 processor board, which contained a 32-bit MIPS R3000A RISC processor soldered on the board and proprietary memory slots. The later version (codename Blackjack) was based on the IP20 processor board, which had a removable processor module (PM1 or PM2) containing a 64-bit MIPS R4000 or R4400 processor. The IP20 used standard 72-pin DIMMs with parity.