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SGI IRIS 2000 General Maintenance

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SGI IRIS 2400 power compartment with second power supply (68020 course workbook)
The 2400 power compartment: I/O panel board, power supply PS1, line filter FL1 and the second supply PS2 added for the Turbo upgrade, with a previous owner's notes at the top (SGI 68020 course workbook)

Care of the SGI IRIS 2000 series. The Turbo models (2300T, 2400T and 2500T) use the same IP2 processor, IM1 memory and graphics boards as the SGI IRIS 3000, so the card cage, IM1 and BP3 switch settings, panel removal, disk formatting and power supply settings on SGI IRIS 3000 General Maintenance apply to them.[1][2] The points particular to the 2000 series below come from SGI's 68020 field-service course and its technical aids, and from Jonathan Levine's 1993–94 IRIS FAQ.[3][1]

Power supplies

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The 2400 has an LM-54 power supply (PS1). A 2400 upgraded to a 2400 Turbo needs a second supply, an LM-11 (PS2), because the LM-54 does not have the current for all the options; the LM-11 can only be paralleled with an LM-54, and SGI's installation document for it is 003-0002.[3] The second supply has to be balanced against the first with the load board, following the upgrade procedure.[4] SGI's settings for the 68020 machines, measured at the supply terminal block, are +5.00 V, +12.10 V, −12.10 V and −5.24 V on channels 1 to 4.[4] Two SGI technical aids change these on 2000-series machines:

  • Some GF2 boards built with an early batch of GA chips failed at the normal +5 V setting, with no picture on the monitor as the symptom. SGI's fix (technical aid GEN-027, 1985, models 2000, 2200 and 2400) was to set V1 to +5.17 V, measured across +S1 and −S1, and tag the supply; such boards are marked Deviation Authorization #002.[5]
  • A fully configured 2400 Turbo with two 170 MB disks and a tape drive loads the +12 V output close to its limit. SGI's interim fix (GEN-036, 1988) was to raise +12 V to 12.14 V with the load board fitted, measured at the supply.[6]

SGI's spare part for the 20-slot chassis power supply on the 2400T is 9430002; the spares list also has a 15 A circuit breaker (9180002), an EMI filter (9300002), the chassis fan (9310002) and 5 A and 2 A fuses (7010001 and 7010002).[7]

Turbo upgrade

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SGI turned a 2400 into a 2400 Turbo by replacing the PM2 processor and PM2M1 memory with the IP2 and IM1 boards (and the Sky floating-point board with the FP1), reformatting and repartitioning the disk and installing the Turbo operating system.[1] Turbo and non-Turbo memory cannot be mixed, and object code built for one does not run on the other.[1]

Memory boards

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In September 1985 SGI began shipping an IP1 board, which carries 2 MB of memory, in place of the PM2 on GL2 machines. The older PM2M memory boards (revisions A to C) do not work with it, and SGI asked for them to be returned for updating to PM2M1 revision D. PM2M1 boards work with either processor, set by a compatibility header at U18K: part 5000-243-01 for the IP1 and 5000-243-02 for the PM2. The four-position switch on the edge of the IP1 sets the start of its memory at 0, 4, 8 or 12 MB, and no other memory board may overlap that range.[8]

Configuration switches

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On non-Turbo machines the rear-panel switch sets the serial line speed (switches 1 and 2), status reports during power-up testing (3), automatic or manual boot (4) and the boot device (5 to 8); switch 9 is reserved and left closed. When the boot device is set to the PROM monitor, switch 4 selects the primary or secondary video driver instead.[1] Turbo machines use the 3000-series switch layout described on SGI IRIS 3000 General Maintenance#Configuration switches.[1]

Disks

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  • Non-Turbo 2000 systems need a boot partition (g), taken from the swap partition, which the default partition tables in fex do not provide. Levine's FAQ lists working partition tables for the Toshiba MK56FB-1 and Vertex V170, and warns that these must not be used on a Turbo or 3000, which will then not boot. When restoring the operating system on a non-Turbo machine, copy tape file 2 to partition g and tape file 3 to partition a.[1]
  • A 2400 with GL2-W2.1 and newer boot PROMs boots from floppy with b mf0a: followed by an optional file name.[9]

The 2500 rack

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The 2500 and 2500T are in a 6 ft (1.8 m) 19-inch rack with space for two SMD drives at the bottom, each weighing about 150 lb (68 kg) according to Levine.[1] A 2500 with a second Winchester drive or other equipment uses an extra power cord with a twist-lock plug (NEMA L5-20) at the rack's power panel and a straight-blade plug (NEMA 5-20P) at the wall. SGI's technical aid GEN-035 says each power cord needs its own outlet on its own 20 A breaker.[10]

Keyboard, monitor and mouse

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Older 2000-series keyboards have a five-pin DIN plug that goes into a junction box, either free-standing or built into the monitor, which connects to the "Control Panel / Port 1" connector with a straight-through DB-25 cable; the mouse plugs into the junction box.[1] On the 2400 Turbo's monitor, the 75-ohm line termination is set by switches on the monitor's back panel and must be on only at the last monitor in a chain.[11] SGI's mouse-cleaning procedure is on SGI IRIS 3000 General Maintenance#Keyboard, mouse and media.[12]

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References

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  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 Jonathan Levine, "Silicon Graphics IRIS 2000/3000 FAQ", revisions of May 1993 to June 1994, sections 2.2, 4.1.1, 4.1.4.2 and 4.2.3, bitsavers.org/pdf/sgi/iris/IRIS_FAQ.txt.
  2. ↑ Silicon Graphics, IRIS Series 3000 Owner's Guide, version 3.0, 007-5220-030, 1987, section 1.2, p. 1-2 (File:SGI IRIS Series 3000 Owner's Guide (007-5220-030).pdf).
  3. ↑ 3.0 3.1 Silicon Graphics, IRIS Workstation Course, 68020 Based, Student Workbook part 2, lesson 5, "Power compartment component location", p. 6 (File:SGI IRIS Workstation Course 68020 Based Student Workbook Part 2.pdf).
  4. ↑ 4.0 4.1 SGI, Student Workbook part 2, lab 8.1, section 5 "Power Supply Adjustments", p. 31.
  5. ↑ SGI Field Engineering, Technical Aid GEN-027, "GF2 Boards", models 2000, 2200 and 2400, 6 March 1985, in Student Workbook part 2.
  6. ↑ SGI Field Engineering, Technical Aid GEN-036, "Tape and Disk errors after upgrade", models 2400 and 2400T, 9 May 1988, in Student Workbook part 2.
  7. ↑ SGI, Student Workbook part 2, lesson 5, "2400T Spare Parts Stocking Guidelines", pp. 15 and 16.
  8. ↑ SGI Field Engineering, Technical Aid GEN-032 R2, "New IP1 board and PM2M1", GL2, 16 September 1985, in Student Workbook part 2.
  9. ↑ SGI Field Engineering, Technical Aid GEN-026, "New procedure for booting from floppies", model 2400 GL2-W2.1, 7 February 1985, in Student Workbook part 2.
  10. ↑ SGI Field Engineering, Technical Aid GEN-035, "Power Receptacles", model 2500, 14 January 1986, in Student Workbook part 2.
  11. ↑ Silicon Graphics, IRIS 3000 Series Workstation Differences (field-service study guide), lesson COMP1, step 5, p. 5 (File:SGI IRIS Series 3000 Workstation Differences Course.pdf).
  12. ↑ SGI Field Engineering, Technical Aid GEN-003, "Mouse Cleaning Procedure", in Student Workbook part 2.


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