Macintosh Quadra 605

Macintosh Quadra 605

October 21 1993|MSRP=970, 1000, 1300|CPU=Motorola 68LC040
CPUspeed=25 MHz|OS=Mac OS 7.1-7.5.1, 7.5.3, 7.5.5-8.1 or with PowerPC upgrade, Mac OS 9.1|RAM=4 MB, expandable to 36 MB (official) or 132 MB (later)|RAMtype=80 ns 72-pin SIMM
Discontinued=October 17 1994

The Quadra 605 is an entry level 68040 microprocessor-based Apple Macintosh personal computer code-named "Aladdin" or "Primus" which was released on October 21 1993 as part of the Quadra series and discontinued on October 16 1994. It was the lowest-model Quadra and one of few Macintoshes to not share a case with another machine, although the internal layout is shared with the Performa/LC 475 family.


* 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. There are no other caches, although an L2 cache is possible via an LC PDS card. The 68LC040 can be replaced with a 68040 which includes onboard Floating Point Unit. This will provide approximately three times the speed in floating point operations [ Mac Benchmarks - Quadra 605 a.k.a. LC 475, Performa 475 or 476] ] .
* 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 72 pin SIMM, but larger SIMMs do work - up to 128 MB may be used, with some limits on RAM type [ Quadra 605] . Quadra 605s work with single-banked SIMMs (Note that single-banked is a logic-level trait, not a physical one; single-banked SIMMs may be single or double sided)] . 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 605s 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.

* Video: Video out is provided by one DA15F connector, and is compatible with VGA Monitors through the use of an adaptor [ VGA Monitors - Which Macintosh Models Are Compatible] ] . Two internal Video RAM slots can take either two 256 kB 80 ns 68-pin VRAM SIMMs, or two 512 kB SIMMs. Installing one 512 kB and one 256 kB VRAM SIMM garbles the display. Resolutions and colors available with the two VRAM configurations are shown in the table below [ Macintosh Quadra 605 Technical Specifications.] ] .

* Audio
** Out - stereo 8-bit, 11 kHz or 22 kHz
** In - Line-level. The input socket is a stereo socket, and can input two channels of a stereo signal - however these are mixed and only accessible to the hardware as a combined mono 8-bit signal. An Apple PlainTalk Microphone provides line-level input by using a longer 4-contact plug which receives power from a 5 V supply within the input jack. Other microphones only give a mic-level input, and do not work with the Quadra 605.Recording is possible at 11 or 22 k samples/second, with filters applied at 3.5 kHz and 7 kHz respectively while recording [ Developer Note - Macintosh LC 475 and Macintosh Quadra 605] ] .

* Floppy Drive: 1.4 MB SuperDrive, manual inject.
* Hard Drive: 80 MB or 160 MB.
* Battery: Quadra 605s take a lithium half-AA cell 3.6 V battery. If the battery is drained, the video will NOT start up. [ Macintosh Computers - Low Battery Can Cause No Video] ] . To start up a Quadra 605 with a flat or missing battery it can be turned on for a few seconds, then turn off for a second then on again. This leaves enough charge somewhere in the system for video to start up.
* Power supply: 30 watts standard, but many second hand machines come with replacement PSUs, either third party, Apple replacement or stripped from earlier LC models. Some of these go up to 45 watts. The Quadra 605 is a registered Energy Star Compliant product [ Energy Star - Registered Apple Products] ] .
*Weight: 8.8 lb / 4 kg standard. A Quadra 605 can support a monitor up to 35 lb / 15.9 kg. [ Desktop Macintosh Computers: How Much Mass (Weight) Can They Support?] ]
* Dimensions: 2.9" high x 12.2" wide x 15.3" deep / 7.4 cm high x 31 cm wide x 38.8 cm deep.


The Quadra 605 contains one LC III style 68030-compatible LC Processor Direct Slot. While this is mechanically compatible with previous models' LC PDS (it will take 96-pin or 114-pin LC PDS slot cards) it is not a true LC PDS [ LC 475, Performa 475 & 476, Quadra 605 - Expansion Slot] ] , but emulates the previous machine's 68030 slot. Due to the success of the LC PDS in earlier Macs and with many expansion options already manufactured Apple kept the same slot type in these 68040 machines [ Macintosh LC 475 & Quadra 605 - LC-PDS Q&A] ] . While the Quadra 605's LC PDS is mostly 68030 compatible, expansion cards made specifically for 030 processors such as 68881 or 68882 FPUs will not work. In addition it could utilize the Apple IIe Card, which allowed the 605 to emulate an Apple IIe.

The Quadra 605 has one SCSI bus, with a 50 pin internal connector (with space for one low profile 3.5" SCSI device) and one 25-pin DB25F external connector. SCSI is provided by an NCR 53C96 controller, which can achieve 6 MB/s internally with a fast enough drive, or 4 MB/s externally. [ Macintosh - SCSI Data Transfer Rates] ]

Two serial ports are provided on a Quadra 605; one 8 pin Mini DIN Printer port and one 9 pin Mini-DIN Modem port similar to the Printer port, but with an extra pin to supply +5 V power from the ADB power supply. Apple recommends no more than 100 mA should be drawn from this pin. [ LC 475, Quadra 605, Performa 475 476 - Serial Ports] ]

The Quadra 605, like most other Macintoshes manufactured before 1999, includes an Apple Desktop Bus port for use with a keyboard/mouse or other low-speed low-power peripherals. Devices may be powered from the ADB port; Apple recommend a maximum combined current draw of 200 mA over a maximum of three ADB devices. [ Macintosh Quadra 605 Specifications.] ]

Some earlier models also contain a ROM SIMM socket, located just to the left of the VRAM. No SIMMs were made for this slot, and most boards only contain the solder pads indicating its position. The ROMs as used in production machines are two surface mount chips located directly behind the CPU. Quadra 605s use a 1024 kB ROM [ Macintosh - ROM Size for Various Models] ] , version 7C. [ Macintosh Computers - ROM Version Numbers] ]

PowerPC Upgrade

The Quadra 605 was compatible with Apple's Macintosh Processor Upgrade Card which provided a 50 MHz PowerPC 601 CPU. DayStar Digital and Sonnet manufactured 100 MHz versions of this card which could also be used in the Quadra 605.

Installation of these cards was inconvenient at best, as LC PDS expansion cards had to be removed in order to fit the processor upgrade.


Some Quadra 605s have a Cuda reset switch which is used to manually reset the PRAM, located towards the rear of the motherboard just to the front of the audio out port and labeled "S1". Others do not include this switch, instead having two solder pads within a silkscreened square.

The keyboard power-on key will not start up a Quadra 605 as there is no soft power-on. Only the rocker switch at the back will turn a Quadra 605 on or off. Pressing the power-on key while running is the same as selecting shut down in the Finder, and once a Quadra 605 has completed its shutdown process it will prompt the operator to manually turn it off.

Quadra 605s have no reset button or programmer's button, but key combinations can perform the same functions. To reset, users can hold down the Command, Control and Power keys. For a programmer's button click, users can hold down the Command and Power keys [ Desktop Macintosh - Power, Reset, and Interrupt Buttons] ] .

A modified Quadra 605 motherboard was used as the basis of early Apple Interactive Television Box prototypes. Later prototypes used their own board design, but still retained a resemblance to the 605.

Gestalt IDs

The standard Gestalt ID for a 25 MHz Quadra 605 is 94 [ Macintosh Computers - Gestalt ID Codes] ] . The ID of the logic board that the Quadra 605 shares with other LC/Performa models depends on two things. Jumper J18 (located just behind the hard drive) will identify the computer as a Quadra 605 (ID 94 @ 25 MHz) if it is ON, and as an LC475/Performa 47x (ID 89 @ 25 MHz) if it is OFF. Over-clocking and under-clocking the motherboard also changes the Gestalt ID. A list of Gestalt IDs returned with various logic board modifications (speed as reported by Newer Technology's "Clockometer") are as follows

ystem software

The Quadra 605 is capable of running Mac OS versions 7.1, 7.1.1 (Pro), 7.5, 7.5.1, 7.5.3, 7.5.5, 7.6, 7.6.1, 8.0, 8.1, 8.5*, 8.5.1*, 8.6*, 9.0*, 9.0.1*, 9.0.2*, 9.0.3*, 9.0.4* and 9.1*. Versions of System Software below 7.5 require the use of System Enabler 065 [ System Enablers - Current Versions & Change History] ] . If a Quadra 605 is running a version of System 7.1, over-clocking it from the standard 25 MHz to 33 MHz will change the gestalt ID, but the enabler will recognise the new ID. Under-clocking to 20 MHz however will change the gestalt ID to one the enabler doesn't recognise as compatible, and the system won't boot. System 7.5+ is not affected by this issue.

*System Software Runs only if you have a PowerPC upgrade installed.

ee also

* Macintosh Quadra
* List of Macintosh models grouped by CPU type
* List of products discontinued by Apple Computer



* Owen Linzmayer, "Apple Confidential 2.0", pg.51, ISBN 978-1-59327-010-0 (2004)

External links

* [ Technical Specifications for Macintosh Centris and Quadra]
* [ Developer Note - Macintosh LC 475 and Macintosh Quadra 605]
* [ Macintosh Quadra 605: Specifications]
* [ Quadra 605: Description]
* [ Applespec Database]
* [ Quadra 605 profile] at
* [ Quadra 605 at]
* [ Quadra 605 at]
* [ the pickle's Low-End Mac FAQ]
* [ Quadra 605 Obsessions]

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