605 Hardware Info & Specs
25Mhz MC68LC040 on a 25Mhz, 32bit bus. LC model 040s contained no FPU.
8k of L1 Cache is divided into 4k of Data and 4k of Instruction cache.
There are no other caches standard. L2 cache is possible via a PDS card.
4Mb on the motherboard, with one 72 pin SIMM socket (80ns or faster
The Apple supported maximum is 36Mb, but larger SIMMs work. Lowend Mac
states that up
to 128Mb may be used, with some limits on RAM type - apparently
Q605s work with all single-banked SIMMs. Note that single-banked is
a logic-level simm trait, not a physical one. Single-banked SIMMs
may be either single or double sided.
Curiously, the DJMEMC
memory controller used in 605's predecessors, the 610 and 650 will only
recognise SIMMs up to 32mb, while the newer MEMCjr used in the 605 recognises
the larger sizes.
Two VRAM sockets can take either two 256k 80ns VRAM SIMMs, or two 512k
80ns VRAM SIMMs. One 512k and one 256k makes a mess of the display :).
Resolutions/Colours available with the two VRAM configurations are shown
in the table below.
One LCIII style 030-compatible PDS. This is not a
true Processor Direct Slot, but emulates the 68030's slot. Due to
the LC PDS being so succesful in earlier LCs, and with many expansion
options having already been manufactured Apple decided to keep
the same slot type in these 68040 machines. While the 605's PDS
is mostly 030-compatible, expansion cards made specifically for 030
processors will not work, such as 68881 or 68882 FPUs.
One 50 pin internal connector, and one 25-pin DB25 external connector
- both on the same SCSI Bus. SCSI is provided by a NCR 53C96 controller,
which can achieve up
to 5mb/sec with a fast enough drive.
One DIN-8 Printer port
One DIN-9 Modem port. Similar to the Printer port, but the extra pin
supplies +5v power from the ADB power supply. Apple recommends no
more than 100mA should be drawn from this supply.
1 port for keyboard/mouse. Power can be drawn from the ADB port, Apple
recommends no more than 200mA total is drawn.
1.4 MB SuperDrive, manual inject.
One Low profile 3.5" 50-pin SCSI Bay.
Out - stereo 8 bit, 11k/sec or 22k/sec
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 5v supply within the input jack. Other microphones
only give a mic-level input, and just plain don't work.
Recording is possible at 11k or 22k samples/second, with filters applied
at 3.5Khz and 7kHz respectively, while recording.
Gestalt IDs in these machines depend on two things. Jumper J18 (located
just behind the Hard Drive) ID's the computer as a Quadra 605 if it
is ON, and as a LC475/Performa 47x if it is OFF. Overclocking and Underclocking
the motherboard also changes the Gestalt ID. ID's I've found (with speed
as reported by Newer Technology's "Clockometer") are as follows
30 Watts standard, but many 2nd 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.
605s take a lithium half-AA cell 3.6v battery. If the battery is drained,
the video will NOT start up. To succesfully start up a 605 with a flat
or missing battery, turn it on for a few seconds, then turn off then
on quickly. This leaves enough charge somewhere in the system for video
to start up.
Weight: 8.8 lbs/4kgs standard
Dimensions: 2.9" High x 12.2" Wide x 15.3" Deep / 7.4cm
High x 31cm Wide x 38.8cm Deep
Can support up to
a 35lb/15.9kg monitor
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
Versions of System
Software below 7.5 require the use of System
Enabler 065. The System Enabler should be installed the System Folder.
Quadra 605s were
introduced in October 1993 and discontinued the following October in
have a cuda reset switch - which is used to manually reset the PRAM
- towards the back of the motherboard, just to the front of the audio
out port and labelled S1. Others don't have this switch installed,
instead just having 2 solder pads within a silkscreened square
Some earlier models
also contain a ROM SIMM socket, located just to the right of the VRAM
socket. No SIMMs containing ROMs were made for this slot, and many boards
only contain the solder pads indicating its position. The ROMs as used
are 2 surface mount chips located directly behind the CPU.
If a Q605 is running
System 7.1, overclocking it from the standard 25Mhz to 33Mhz will change
the gestalt ID, but won't cause problems with the OS. Underclocking
however, to 20Mhz will leave change the gestalt ID to one the system
doesn't recognise as compatible, and the system won't boot. System 7.5+
isn't affected by this.
The keyboard power-on
key, marked , will
not start up a Quadra 605. Only the power switch at the back will do
so. Pressing the power-on key while running is the same as selecting
shut down. Once a 605 has shut down, it will ask you to manually turn
Quadra 605s have
no reset button or programmer's button, but keyboard key combinations
can perform the same functions. To reset, hold down the Apple, Option
and Power keys. For a programmer's button press, hold down just the
Apple and Power keys.
Specs - Information from apple.com on specs of all released products.
macs in general
- Downloadable filemaker-pro database (standalone and data files available)
with info on -everything- apple.
- Excellent resource with technical information and articles on using
Quadra 605 Info
- Specs and info for every model macintosh and mac clone.
- Museum with information on all macintosh models.
- Frequently asked questions about getting older macintoshes up &