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Macintosh Quadra 605
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Macintosh Quadra 605
The Macintosh Quadra 605 (also sold as the Macintosh LC 475 and Macintosh Performa 475) is a personal computer designed, manufactured, and sold by Apple Computer from October 1993 to July 1996. The model names reflect a decision made at Apple in 1993 to follow an emerging industry trend of naming product families for their target customers – Quadra for business, LC for education, and Performa for home. Accordingly, the Performa 475 and 476 were sold in department stores and electronics stores such as Circuit City, whereas the Quadra was purchased through an authorized Apple reseller.
When introduced, the Quadra 605 was the least expensive new computer in Apple's lineup. (The Performa 410, introduced at the same time, at the same price of about US$1,000, which included a monitor, was based on the much older Macintosh LC II with a 16 MHz 68030 processor.) The Quadra 605 reuses the Macintosh LC III's pizza box form factor with minor modifications.
The Quadra 605 was discontinued in October 1994, and the LC 475 variant continued to be sold to schools until July 1996. Apple offered no direct replacement for these machines, making it the final Macintosh to use the LC's lightweight slim-line form factor. Apple would not release another desktop computer under 10 pounds (4.5 kg) until the Mac Mini, nearly ten years later.
All models come standard with a Motorola 68LC040 CPU running at 25 MHz, 4 MB RAM on board, 512 KB of VRAM (expandable to 1 MB), 1 LC III-style Processor Direct Slot, 1 ADB and 2 serial ports, external SCSI port, and a manual-inject floppy drive.
Introduced October 18, 1993:
Introduced October 21, 1993:
Central processing unit: 25 MHz MC68LC040, 32-bit bus. 8 KB of on-chip L1 cache is divided into 4 KB of data and 4 KB of instruction cache. Third-party cache cards can be installed in the CPU socket to provide a L2 cache. The 68LC040 can be replaced with a 68040 which includes onboard Floating Point Unit. This will approximately triple the speed of floating point operations.
Random-access memory: 4 MB on the motherboard, one 72-pin SIMM socket for 80 ns or faster SIMMs. The official supported maximum RAM is 36 MB in one 32 MB 72-pin SIMM plus 4 MB on the motherboard, but larger SIMMs do work—up to 128 MB may be used, with some limits on RAM type. Physical limits might apply if the side of the SIMM facing the CPU has thicker chips, as the clips on the SIMM socket will not close around it automatically. It should be possible to manually push the clips enough to hold the SIMM in place. The DJMEMC memory controller used in the Quadra 605's predecessors (Quadra/Centris 610, Quadra/Centris 650 and Quadra 800) will only recognize SIMMs up to 32 MB, while the newer MEMCjr used in the Quadra 605 recognizes the larger sizes.
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Macintosh Quadra 605 AI simulator
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Macintosh Quadra 605
The Macintosh Quadra 605 (also sold as the Macintosh LC 475 and Macintosh Performa 475) is a personal computer designed, manufactured, and sold by Apple Computer from October 1993 to July 1996. The model names reflect a decision made at Apple in 1993 to follow an emerging industry trend of naming product families for their target customers – Quadra for business, LC for education, and Performa for home. Accordingly, the Performa 475 and 476 were sold in department stores and electronics stores such as Circuit City, whereas the Quadra was purchased through an authorized Apple reseller.
When introduced, the Quadra 605 was the least expensive new computer in Apple's lineup. (The Performa 410, introduced at the same time, at the same price of about US$1,000, which included a monitor, was based on the much older Macintosh LC II with a 16 MHz 68030 processor.) The Quadra 605 reuses the Macintosh LC III's pizza box form factor with minor modifications.
The Quadra 605 was discontinued in October 1994, and the LC 475 variant continued to be sold to schools until July 1996. Apple offered no direct replacement for these machines, making it the final Macintosh to use the LC's lightweight slim-line form factor. Apple would not release another desktop computer under 10 pounds (4.5 kg) until the Mac Mini, nearly ten years later.
All models come standard with a Motorola 68LC040 CPU running at 25 MHz, 4 MB RAM on board, 512 KB of VRAM (expandable to 1 MB), 1 LC III-style Processor Direct Slot, 1 ADB and 2 serial ports, external SCSI port, and a manual-inject floppy drive.
Introduced October 18, 1993:
Introduced October 21, 1993:
Central processing unit: 25 MHz MC68LC040, 32-bit bus. 8 KB of on-chip L1 cache is divided into 4 KB of data and 4 KB of instruction cache. Third-party cache cards can be installed in the CPU socket to provide a L2 cache. The 68LC040 can be replaced with a 68040 which includes onboard Floating Point Unit. This will approximately triple the speed of floating point operations.
Random-access memory: 4 MB on the motherboard, one 72-pin SIMM socket for 80 ns or faster SIMMs. The official supported maximum RAM is 36 MB in one 32 MB 72-pin SIMM plus 4 MB on the motherboard, but larger SIMMs do work—up to 128 MB may be used, with some limits on RAM type. Physical limits might apply if the side of the SIMM facing the CPU has thicker chips, as the clips on the SIMM socket will not close around it automatically. It should be possible to manually push the clips enough to hold the SIMM in place. The DJMEMC memory controller used in the Quadra 605's predecessors (Quadra/Centris 610, Quadra/Centris 650 and Quadra 800) will only recognize SIMMs up to 32 MB, while the newer MEMCjr used in the Quadra 605 recognizes the larger sizes.
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