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Cray Research EL-98

Cray Research EL-98

During the middle years of the Cray YMP family, the low end of the Cray customer base was being eroded by smaller air-cooled machines like the Convex c220. Around this time a small start-up company called SuperTek introduced the SuperTek S-1, an air-cooled CMOS implementation of the XMP CPU architecture linked to a proprietary VME I/O subsystem. SuperTek solicited the Cray customer base but failed to gain many customers. Eventually the company went bankrupt and was bought by Cray. The SuperTek S-1 was then sold and supported by Cray as the Cray XMS. The SuperTek S-2 was developed and became the Y-MP/EL, a CMOS implementation of the YMP architecture. The YMP-EL initially available in 1..4 CPUs used a very similar VME based IO sub-system to the XMS system. The YMP-EL was received with reasonable enthusiasm by the XMS customer base, which had been struggling with the difficult XMS product, and the baby Cray started to sell in reasonable numbers, for a Cray product anyway.

This 1995 Cray Research model EL-98 came to us through the generosity of Aerosoft, Inc. of Blacksburg, Va. The EL-98 (Entry Level) was a smaller version of the Y-MP introduced in 1988 and utilised more compact technology, materially reducing its size. It runs version 8.0.1 of Cray's UNICOS operating system.The system contains the following boards:
 
Processor Subrack:
Slot 1 is at the left. 
Slot Option Description Module #
1
MEM32 32MW RAM, S/N 298 90003440-A0
2
MEM32 32MW RAM, S/N 869 90003440-A0
3
CPU CPU, S/N 224 90191013-A1
4
CPU CPU, S/N 371 90191013-A1
5
CPU CPU, S/N 203 90191013-A1
6
CPU CPU, S/N 15 90191013-A1
7
MEM32 32MW RAM, S/N 873 90003440-A0
8
MEM32 32MW RAM, S/N 874 90003440-A0
 
VME Chassis:
Slot 1 is at the left.
Slot Option Description
1
IOP I/O Processor (68K)
2
IOBP-25 I/O Buffer Board
3
SI-3 SCSI Controller, HV Differential
4
SI-3 SCSI Controller, HV Differential
5
EI-1 Ethernet
6
7
8
9
 
The system contains two PE-5S disk boxes. Each with four Seagate ST43401ND Differential SCSI drives.

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