- IRIS 3000 workstations & Terminals -
" IM1 Memory Board "
IM1 Assy: 5000-532
IRIS 3000 systems need an IM1 memory board.
It connected to the private bus connection initiated by the IP2 CPU board.
Thus bus is separate from the Multibus backplane.
Using IM1 boards the memory can be upgraded
from 2 to 16 MB on IRIS 3000 workstations
and from 2 to 12 MB on IRIS 3000 terminals.
The IM1 board is available in 2 MB and 4 MB versions.
As the single RAM chips are hardwired to the IM1 board
a memory upgrade requires replacement or addition of IM1 boards.
Note that the last one in a chain of memory boards
needs to be terminated using an IM1 terminator.
The IM1 memory board is also used
with the IRIS 2000 Turbo models.
It is not compatible with IRIS 2000 non-Turbo models.
IRIS 2000 and 3000 series
SGI rapidly developed its machines into workstations with its second product line
— the IRIS 2000 series, first released in August, 1985.
SGI began using the UNIX System V operating system.
There were five models in two product ranges,
the 2000/2200/2300/2400/2500 range
which used 68010 CPUs (the PM2 CPU module),
and the later "Turbo" systems, the 2300T, 2400T and 2500T,
which had 68020s (the IP2 CPU module).
All used the Excelan EXOS/201 Ethernet card,
the same graphics hardware (GF2 Frame Buffer,
UC4 Update Controller,
DC4 Display Controller, BP3 Bitplane).
Their main differences were the CPU, RAM,
and Weitek Floating Point Accelerator boards, disk controllers
and disk drives (both ST-506 and SMD were available).
These could be upgraded, for example from a 2400 to a 2400T.
The 2500 and 2500T had a larger chassis,
a standard 6' 19" EIA rack with space at the bottom
for two SMD disk drives weighing approximately 68 kg each.
The non-Turbo models used the Multibus for the CPU
to communicate with the floating point accelerator,
while the Turbos added a ribbon cable dedicated for this.
60 Hz monitors were used for the 2000 series.
The height of the machines using Motorola CPUs
was reached with the IRIS 3000 series
(models 3010/3020/3030 and 3110/3115/3120/3130,
the 30s both being full-size rack machines).
They used the same graphics subsystem
and Ethernet as the 2000s,
but could also use up to 12 "geometry engines",
the first widespread use of hardware graphics accelerators.
The standard monitor was a 19" 60 Hz non-interlaced unit
with a tilt/swivel base; 19" 30 Hz interlaced and a 15" 60 Hz non-interlaced
(with tilt/swivel base) were also available.
The IRIS 3130 and its smaller siblings were impressive for the time,
being complete UNIX workstations.
The 3130 was powerful enough to support a complete 3D animation
and rendering package without mainframe support.
With large capacity hard drives by standards of the day
(two 300 MB drives), streaming tape and Ethernet,
it could be the centerpiece of an animation operation.
Rare: The line was formally discontinued in November 1989,
with about 3500 systems shipped of all 2000 and 3000 models combined.
Estimated cost: 300 € is only 20 € / CPU !!!!
Other IRIS 3000 séries Cards available in my Shop:
Disponibles dans ma boutique :
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