IBM 3270 PC/G
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| 3270 PC/G with 5279 Color Display on its 5278 Display Attachment Unit, 5277 mouse and 5152 printer (IBM photograph, 1984) | |
| Specifications | |
|---|---|
| Manufacturer | IBM |
| Type | Graphics work station and 3270 display station |
| Released | 1984 |
| Intro price | US$9,535 minimum configuration (1984)[1] |
| CPU | Intel 8088 at 4.77 MHz (PC XT-based 5371 system unit) |
| Memory | 384 KB (Model 12) or 512 KB (Models 14 and 16) as described in 1984; up to 640 KB with the 5279[2] |
| Storage | One or two 360 KB 5.25-inch diskette drives; 10 MB fixed disk on Model 16 |
| Display | IBM 5279 Color Display (14-inch, 720 × 512, eight colours) driven by the IBM 5278 Display Attachment Unit |
| Sound | PC speaker |
| Dimensions | System unit 142 × 500 × 410 mm[3] |
| Weight | System unit 12.7 kg (Model 12) to 15 kg (Model 16)[3] |
| OS / Firmware | 3270 PC Graphics Control Program with PC DOS 2.1 |
| Model no. | 5371 Models 12, 14 and 16 with 5278 Model 1 and 5279 |
The IBM 3270 PC/G is the colour graphics member of the IBM 3270 PC family, introduced by IBM in 1984. It combines a 5371 system unit, based on the PC XT, with the IBM 5279 Color Display and the IBM 5278 Display Attachment Unit that drives it.[3][2] It runs the 3270 PC Graphics Control Program (GCP), which includes the functions of the 3270 PC Control Program and adds graphics for both host applications (through GDDM on the host) and local PC applications.[3] The IBM 3270 PC/GX uses the same 5371 system unit with a larger display and a faster display attachment unit.[3]
History
[edit | edit source]IBM's introductory manual for the PC/G and PC/GX is dated May 1984.[2] BYTE listed the 5371 system unit at US$4,130 (Model 12), US$4,755 (Model 14) and US$6,580 (Model 16), with the 5279 Color Display at US$1,600, the 5278 Display Attachment Unit at US$3,060, the keyboard at US$295 and the 5277 mouse at US$340. It gave the minimum PC/G configuration as US$9,535.[1] An AT-based equivalent, the 3270 PC AT/G, used the 5373 system unit with the 5278 Model 2.[3]
Models
[edit | edit source]| Model | Memory (GA33-3141-0, 1984) | Storage | Standard adapters |
|---|---|---|---|
| 12 | 384 KB | One 360 KB diskette drive | Display Unit Adapter, 3270 System Adapter, Keyboard/Tablet/Mouse Adapter, Diskette Adapter, Printer Adapter |
| 14 | 512 KB | Two 360 KB diskette drives | As Model 12 |
| 16 | 512 KB | One 360 KB diskette drive and a 10 MB fixed disk | As Model 12, plus fixed disk adapter |
IBM's 1989 Service Information Manual describes Model 16 differently in different places: 640 KB in its PC/G section, and 576 KB in its PC/GX section and slot table. BYTE also gave 576 KB.[3][1] Memory can be expanded to 640 KB with the 5279, but only to 576 KB with the 5379 of the PC/GX.[2][3]
The 5371 has six full-feature slots (1 to 6) and two special-feature slots (7 and 8). IBM's standard slot allocation:[2][3]
| Slot | Card |
|---|---|
| 1 | Display Unit Adapter |
| 2 | 3270 System Adapter (DFCA) |
| 3 | Memory (64/256 KB expansion option) |
| 4 | Keyboard/Tablet/Mouse Adapter |
| 5 | Fixed disk adapter (Model 16) |
| 6 | Diskette adapter |
| 7 | Printer Adapter or Printer/Memory Adapter |
| 8 | Free |
Options included the 5277 Mouse, the 5083 Tablet Model 2 with a four-button cursor or stylus, the 5152 Graphics Printer, the 3852 Color Ink Jet Printer, an IEEE-488 adapter for IBM 7371 to 7375 plotters, an RS-232C adapter, the APL keyboard and the PC bus extension adapter for a 5161 Expansion Unit (Models 12 and 14 only).[3][2]
Hardware
[edit | edit source]IBM describes the 5371 as "based on a 5160 System Unit for the IBM Personal Computer XT". The Display Unit Adapter, Keyboard/Tablet/Mouse Adapter and Printer/Memory Adapter, and the 5278, 5279 and 5277, are unique to the PC/G and PC/GX.[3] The 5271's display adapter, All Points Addressable and Programmed Symbols cards are not used.
IBM 5278 Display Attachment Unit
[edit | edit source]The 5278 is a flat unit on which the 5279 can stand. It provides the alphanumeric and graphics processing and the buffer storage for the 5279, has hardware for drawing lines and filling areas, and emulates the PC Color/Graphics Monitor Adapter. Model 1 (P/N 1887693) attaches to the 5371; Model 2 (P/N 1887745) is for the AT-based 5373. IBM warns that a Model 1 attached to a 5373 can cause interference on part of the screen.[3]
The 5278 connects to the system unit by a 1 m signal cable (P/N 1887792) and to the 5279 by a 680 mm cable (P/N 1887778). It has no mains lead of its own: it takes its power from the 5279, which has a 1.8 m power cord.[3] It measures 411 × 380 × 37 mm and weighs 8.2 kg (18 lb).[3]
IBM 5279 Color Display
[edit | edit source]| Item | Value |
|---|---|
| Screen | 14-inch, viewing area 240 × 181 mm |
| Resolution | 720 × 512 pels, 76 pels per inch |
| Refresh | 42 times per second, non-interlaced |
| Text | 80 × 32 (2,560 characters) or 80 × 49 (3,920 characters), set when the GCP is customised |
| Characters | 9 × 10 pels (8 × 10 in a DOS session) in a 9 × 16 box |
| Colours | Up to eight |
| Supply | 100 to 127 V, 50 or 60 Hz |
| Size | 411 × 400 × 315 mm without stand |
| Weight | 18.2 kg (40 lb), or 25 kg (55 lb) with the lift/tilt/swivel stand |
| Tilt and swivel | −5 to +20°, ±40° |
IBM's part numbers for the 5279 group are 1887678 (colour display element), 5699346 (power cable), 1887778 (monitor to DAU cable), 1887676 (tilt/swivel assembly) and 1887675 (lift/tilt/swivel assembly).[3]
The CGA emulation does not support a light pen, border colour, TV monitors, background intensity, 40 × 25 text, a block cursor on the 5279, or storage for multiple display formats. A standard PC keyboard and a Color/Graphics Monitor Adapter are not permitted in the work station.[2]
Keyboard, mouse and tablet
[edit | edit source]The keyboard is the 122-key 3270 PC keyboard with 24 program function keys; an APL version has APL symbols marked in orange.[2] IBM's parts catalogue refers the 5371 keyboard to the 5271 keyboard part numbers.[3] One 5277 Mouse or one 5083 Tablet can be attached at a time, through the Keyboard/Tablet/Mouse Adapter. The 5277 has three keys and reads its position optically from a printed pad; it measures 66 × 99 × 25 mm and weighs 168 g.[3]
Software
[edit | edit source]The Graphics Control Program runs on the work station and includes the 3270 PC Control Program functions.[3] With either display attachment unit it provides vector to raster conversion, picture moving, scaling and scrolling, two-dimensional transforms, clipping, correlation, lines, areas and fills, arcs and fillets, and vector and image characters.[2] On the host, the Graphical Data Display Manager (GDDM) provides the graphics for host applications.[3] The work station attaches to an IBM 3274 control unit with configuration support T or D.[2]
Known faults
[edit | edit source]The system board, power supply and drives follow the PC XT, so the faults on the IBM 3270 PC Capacitor Replacement Guide and IBM PC XT Troubleshooting Guide apply.[3] Points specific to the PC/G:[3]
- 44xx errors point to the display attachment unit and display together; on the XT-based PC/G and PC/GX the Display Unit Adapter is also in the list.
- A 5278 with no picture can be a 5279 supply fault, since the 5279 powers it.
- If a long DFCA has been replaced with the short card, the Keyboard/Tablet/Mouse Adapter must be updated (ECA040), or POST gives a false 2801.
- Some early 5371 keyboard/tablet adapters give random characters from the keyboard after power-on, intermittently. They are about 1.5 inches shorter than a full-length card and have no yellow wires on the solder side; IBM advises replacing them only if they fail.
See the IBM 3270 PC/G Troubleshooting Guide.
Documentation
[edit | edit source]- 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 maintenance manual for the PC/G was SY33-0112, IBM 3270 Personal Computer/G: Maintenance Information for Work Stations that Use the IBM 5279 Color Display.[2] The hosted IBM 3270 PC AT/GX Maintenance Information covers the 5378 and 5379 of the AT/GX, not the 5278 and 5279.
Related pages
[edit | edit source]- IBM 3270 PC/G Maintenance Guide
- IBM 3270 PC/G Troubleshooting Guide
- IBM 3270 PC/G Capacitor Replacement Guide
- IBM 3270 PC
- IBM 3270 PC/GX
- IBM PC XT (5160)
References
[edit | edit source]- ↑ 1.0 1.1 1.2 "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 2.11 2.12 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 and system units pp. 3-4; components pp. 22-31; display attachment unit functions p. 27; memory and configurations pp. 66-72 (Figures 31 and 32); 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 3.14 3.15 3.16 3.17 3.18 3.19 3.20 3.21 3.22 IBM, IBM Personal Computer Family Service Information Manual, SA38-0037-00, 1989, hosted as IBM Personal Computer Family Service Information Manual. Chapter 10, pp. 10-4 to 10-12: PC/G description, 5371 models and unit specifications, slot allocation, 5278 and 5279 specifications, 5277 mouse and 5083 tablet, 3270 unique error codes and PC/G diagnostic tips. Chapter 18, pp. 18-33 and 18-34: 5371, 5278 and 5279 FRU numbers.