IBM 3270 PC/GX
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| 3270 PC/GX: 5371 system unit on a 5378 Display Attachment Unit, 5379 Display, keyboard and 5083 tablet (IBM photograph, 1984) | |
| Specifications | |
|---|---|
| Manufacturer | IBM |
| Type | High-resolution graphics work station and 3270 display station |
| Released | 1984 |
| Intro price | US$16,785 minimum configuration (1984)[1] |
| CPU | Intel 8088 at 4.77 MHz (PC XT-based 5371 system unit); Motorola 68000 graphics processor in the 5378 |
| Memory | 384 KB (Model 12) or 512 KB (Models 14 and 16) as described in 1984; up to 576 KB with the 5379[2] |
| Storage | One or two 360 KB 5.25-inch diskette drives; 10 MB fixed disk on Model 16 |
| Display | IBM 5379 Display, 19-inch, Model C01 (colour) or M01 (monochrome), driven by the IBM 5378 Display Attachment Unit; 1024 × 1024 graphics |
| Sound | PC speaker |
| OS / Firmware | 3270 PC Graphics Control Program with PC DOS 2.1 |
| Model no. | 5371 Models 12, 14 and 16 with 5378 and 5379 Model C01 or M01 |
The IBM 3270 PC/GX is the high-resolution graphics member of the IBM 3270 PC family, introduced by IBM in 1984 alongside the IBM 3270 PC/G. It uses the same 5371 system unit as the PC/G, based on the PC XT, with the 19-inch IBM 5379 Display and the IBM 5378 Display Attachment Unit, which contains a Motorola 68000 graphics processor.[3][2] IBM positioned the 5379 Color Display for precision graphics such as map drawing and electronic design, and the monochrome model for engineering drawings and page composition.[3]
History
[edit | edit source]IBM's introductory manual for the PC/G and PC/GX is dated May 1984.[2] BYTE listed the 5379 Color Display at US$3,600 and the 5379 Monochrome Display at US$2,750, the 5378 Display Attachment Unit at US$8,310 (colour) or US$7,810 (monochrome), and the minimum PC/GX configuration at US$16,785. The 5371 system unit cost US$4,130 to US$6,580 depending on model.[1] The AT-based 3270 PC AT/GX used the same 5378 and 5379 with a 5373 system unit.[3]
Models
[edit | edit source]The 5371 models are those of the PC/G. IBM's 1984 manual gives Model 12 384 KB, and Models 14 and 16 512 KB each; with the 5379, memory can be expanded to 576 KB, against 640 KB with the PC/G's 5279.[2] The Service Information Manual lists the PC/GX Model 16 with 576 KB.[3] The slot allocation, adapters and options are as described on the PC/G page. The PC/GX can also drive a 5151 Monochrome Display as a second screen through a Monochrome Display/Printer Adapter.[2]
IBM 5378 Display Attachment Unit
[edit | edit source]The 5378 contains a Motorola 68000 graphics processor for vector, character and image processing, and 128 KB of memory for vector lists, character sets, character buffers and system functions, shared by the 68000 and the system unit's processor.[3] It connects to the system unit by a 62-way bus extender cable, 1 m long, and to the 5379 by 2 m cables.[4][3] Its own power supply produces +5 V, −5.2 V, +12 V and −12 V, and its logic gate holds up to eight cards: display bus receiver, graphics processor, system control, update control, clock and video driver, and up to three bit-plane cards.[4]
The 5378 has its own 1.8 m power cable, and it powers the 5379: the On/Off switch on the front of the 5378 controls the mains to the display.[3][4] Model C01 drives the colour 5379 and Model M01 the monochrome one.[2] The unit measures 495 × 406 × 130 mm and weighs 14 kg (31 lb) in the Service Information Manual; the 1984 manual gives 120 mm high, 450 mm deep and 15 kg.[3][2] It can be stacked above or below the 5371, 5373 or 5161.[3]
IBM's hazard labels for these units are 25,000 V on the 5379 and 800 V on the 5378.[4]
IBM 5379 Display
[edit | edit source]| Item | Value |
|---|---|
| Screen | 19-inch; viewing area 280 × 280 mm |
| Text layer | 80 × 50 characters (4,000), 12 × 20 character box |
| Graphics layer | 1024 × 1024 pels, 93 pels per inch; 960 × 1000 in a 261 × 279 mm area under Graphics Control Program Version 1 |
| Refresh | 52 frames per second non-interlaced (SIM); 57 frames per second (AT/GX Maintenance Information) |
| Colour model C01 | Up to 16 colours in the graphics layer, 8 in the text layer; degauss control |
| Monochrome model M01 | Up to four intensities in the graphics layer, two in the text layer |
| Supply | 100 to 127 V, 50 or 60 Hz, from the 5378 |
| Size | 500 mm wide × 460 mm high; 488 mm deep (colour), 525 mm (monochrome) |
| Weight | 35 kg (77 lb) in the SIM; 32 kg (70.5 lb) in GA33-3141-0 |
| Tilt and swivel | −5 to +15°, ±120° |
IBM notes that the 1024 × 1024 resolution equals that of the 5080 Graphics System display, and that a 5379 and a second-screen 5151 can interfere with each other if placed too close together.[3]
Software
[edit | edit source]The PC/GX runs the Graphics Control Program, as on the PC/G. Host graphics come from GDDM Release 4, which adds 5379 functions including three-dimensional graphics, 16 colours, and moving vector conversion from the host to the work station.[3] The 5378's graphics processor handles vector to raster conversion, clipping, transformation and correlation.[2]
Known faults
[edit | edit source]The system unit follows the PC XT and the 3270 PC; see the IBM 3270 PC Troubleshooting Guide. IBM's notes for the 5378 and 5379:[3]
- 44xx errors point to the 5378 and 5379 as a pair, and on the XT-based PC/GX to the display adapter card in the system unit.
- If the 5378 power light stays off, check the voltage selector switch at the upper right of the rear of its power supply; it shows the voltage it is set for (115 for the USA and Canada).
- The 5378 logic boards can be inserted the wrong way round, which damages the cards. Follow IBM's orientation procedure when refitting them.
- Focus faults or unstable display on the 5379 can come from arcing between two capacitors on the CRT card.
- Deflection card P/N 4421622 does not fit the older green XY connector from the yoke; units from serial number 2585 have the brown connector. IBM's ECA037 and kit P/N 59X6942 correct it.
See the IBM 3270 PC/GX Troubleshooting Guide for the full list and IBM's power supply limits.
Documentation
[edit | edit source]- IBM 3270 PC AT/GX Maintenance Information (SY33-0125-1): IBM's AT/GX service manual, covering the 5378 and 5379 to card level.[4]
- Introducing the IBM 3270 Personal Computer/G and /GX Work Stations (GA33-3141-0, May 1984).[2]
- IBM Personal Computer Family Service Information Manual (SA38-0037-00), chapter 10.[3]
- IBM's own PC/GX maintenance manual was SY33-0111, IBM 3270 Personal Computer/GX: Maintenance Information for Work Stations that Use the IBM 5379 Display.[2]
Gallery
[edit | edit source]-
3270 PC/GX with 5083 tablet (IBM, 1984) -
3270 PC AT/GX work station with 5379 display, the AT-based equivalent
Related pages
[edit | edit source]- IBM 3270 PC/GX Maintenance Guide
- IBM 3270 PC/GX Troubleshooting Guide
- IBM 3270 PC/GX Capacitor Replacement Guide
- IBM 3270 PC
- IBM 3270 PC/G
- IBM PC XT (5160)
References
[edit | edit source]- ↑ 1.0 1.1 "IBM Personal Computers At a Glance", BYTE Guide to the IBM PC, Fall 1984, p. 24. 3270 PC/G and GX component prices.
- ↑ 2.00 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.09 2.10 IBM, Introducing the IBM 3270 Personal Computer/G and /GX Work Stations, GA33-3141-0, first edition, May 1984, hosted as File:Introducing the IBM 3270 PC G and GX Work Stations GA33-3141-0.pdf. Displays pp. 3-4 and 23-27; 5371 p. 28; dual screen p. 48; memory and configurations pp. 66-72; dimensions p. 81; compatibility limits p. 100.
- ↑ 3.00 3.01 3.02 3.03 3.04 3.05 3.06 3.07 3.08 3.09 3.10 3.11 3.12 3.13 IBM, IBM Personal Computer Family Service Information Manual, SA38-0037-00, 1989, hosted as IBM Personal Computer Family Service Information Manual. Chapter 10, pp. 10-5 to 10-13: PC/GX description, 5371 models and slot allocation, 5378 and 5379 specifications and power arrangement, 5378 card plugging chart, 3270 unique error codes, and diagnostic tips for the 5378 and 5379.
- ↑ 4.0 4.1 4.2 4.3 4.4 4.5 IBM, IBM 3270 Personal Computer AT/GX Maintenance Information, SY33-0125-1, June 1986, hosted as IBM 3270 PC AT/GX Maintenance Information. 5379 and 5378 descriptions pp. 1-11 to 1-13; hazard labels in the safety inspection guide; 5378 power supply charts pp. 3-4400-39 and 3-4400-40; parts catalogue pp. 7-6, 7-10 and 7-12.