IBM 5120
 | |
| IBM 5120 Computing System | |
| Specifications | |
|---|---|
| Developer | IBM General Systems Division |
| Manufacturer | IBM |
| Type | Desktop business computer |
| Released | Announced 5 February 1980 |
| Intro price | US$9,340 to US$23,990 (1980) |
| CPU | IBM processor card, the same design as the IBM 5110's; known as PALM |
| Memory | 16, 32, 48 or 64 KB |
| Storage | Two built-in 8-inch diskette drives, up to 2.4 MB; one optional IBM 5114 Diskette Unit for up to 4.8 MB |
| Display | Built-in 9-inch CRT, 16 lines of 64 characters |
| Sound | Audible Alarm (standard) |
| Power | 0.52 kVA at 120 V 60 Hz |
| Dimensions | 580 × 537 × 385 mm (23.2 × 21.4 × 15.4 in), front × side × height |
| Weight | 48 kg (106 lb) |
| OS / Firmware | APL, BASIC or both, in ROS |
| Predecessor | IBM 5110 |
| Model no. | 5120; computer unit IBM 5110 Model 3 |
The IBM 5120 Computing System is a desktop computer that IBM's General Systems Division announced on 5 February 1980.[1] Its computer unit is the IBM 5110 Model 3, a repackaged IBM 5110 with two built-in 8-inch diskette drives and a 9-inch display. It runs the same programs as a similarly configured 5110.[1][2]
Datapro described the starting price of US$9,340 as the lowest ever placed on a disk-oriented IBM computer system. At announcement IBM moved the 5110 to "limited new" production status, and first deliveries were in February 1980 for the 32K BASIC model and March 1980 for the others.[1]
Configurations
[edit | edit source]The 5110 Model 3 came in 12 submodels, covering BASIC, APL or both, each with 16K, 32K, 48K or 64K bytes of main storage. System purchase prices ran from US$9,340 to US$23,990; a configuration with BASIC, 32K and a 120 cps printer cost under US$13,500.[3] A 5103 Printer and a 5114 Diskette Unit could be attached.[4]
IBM announced six accounting application packages with the 5120: Billing, Payroll, Accounts Payable, Accounts Receivable, Inventory Reporting and General Ledger, each licensed at US$60 a month, paid up after 24 months.[4][3]
Hardware
[edit | edit source]Processor and logic
[edit | edit source]Datapro reported that the 5110 Model 3 uses a single-card processor believed to be the same one as in the 5110, and that main storage cycles in 530 ns per two-byte access.[1] IBM's 5120 logic manual has sheets for base I/O, processor, executable and feature ROS, APL and common/language ROS, the display adapter, the internal diskette unit and the 5114.[5] The language interpreters are in read-only storage built from 72K- and 96K-bit chips.[4]
Display and storage
[edit | edit source]The 9-inch display shows up to 1,024 characters in 16 lines of 64.[6] The two internal diskette drives hold up to 2.4 MB; adding a 5114 raises this to 4.8 MB. No tape unit was offered for the 5120.[4]
Features
[edit | edit source]The Composite Video Adapter, which drives additional screens, and the Audible Alarm are standard. The options are the Diskette Sort Feature, a Serial I/O Adapter for one RS-232C device, an Asynchronous Communications Adapter that emulates an IBM 2741 terminal at 134.5 or 300 bit/s, and a Binary Synchronous Communications Adapter emulating the IBM 2770 or 3741 protocols at up to 4,800 bit/s.[4]
Physical and electrical
[edit | edit source]IBM gives the 5110 Model 3 as 580 mm across the front, 537 mm along the side and 385 mm high (23.2 × 21.4 × 15.4 in), weighing 48 kg (106 lb). It draws 0.52 kVA and gives off 1,774 BTU per hour at 120 V 60 Hz, and 0.57 kVA and 1,945 BTU per hour on 200–240 V 50 Hz.[2]
The power supply holds two PC boards. The larger is a transistor switching regulator producing +5, −5, +8.5, +12 and −12 V for the computer, with the same protection as the 5110's supply; after an automatic shutdown IBM says to leave the machine off for at least 60 seconds, not the five seconds given for the 5100 and 5110. The smaller board is a ferroresonant supply producing +5, −5 and +24 V for the internal diskette drives, with a fuse on each output.[7] The supply also holds transformer T1, resonant capacitor C4 and circuit breaker CB1.[8] See the IBM 5120 Capacitor Replacement Guide.
Documentation
[edit | edit source]- IBM 5120 Maintenance Information Manual, SY34-0192-0, December 1979. The scan has no text layer.
- IBM 5120 Computing System Logic Manual, SY34-0193-0, December 1979.
- Datapro's April 1980 report on the 5120 (PDF).[1]
The 5120 maintenance library also used the 5114, 5103 and communications manuals of the 5110 system.[9] See IBM 5110 for those.
Gallery
[edit | edit source]-
IBM 5120 Computing System -
IBM 5120, front -
IBM 5120 keyboard -
IBM 5120 system
Related pages
[edit | edit source]- IBM 5120 Maintenance Guide
- IBM 5120 Troubleshooting Guide
- IBM 5120 Capacitor Replacement Guide
- IBM 5110
- IBM 5100
- IBM 5114 Diskette Unit Maintenance Information
References
[edit | edit source]- ↑ 1.0 1.1 1.2 1.3 1.4 Datapro Research, IBM 5120 Computing System, report M11-491-201 to -208 (April 1980), p. 201. Hosted as File:Datapro M11-491-20 IBM 5120 Computing System (April 1980).pdf.
- ↑ 2.0 2.1 IBM, IBM 5120 Maintenance Information Manual, SY34-0192-0 (December 1979), p. A-3, "5110 Model 3 Specifications". Hosted as IBM 5120 Maintenance Information Manual.
- ↑ 3.0 3.1 Datapro, M11-491-203, pricing summary and application packages.
- ↑ 4.0 4.1 4.2 4.3 4.4 Datapro, M11-491-202, management summary and physical specifications.
- ↑ IBM, IBM 5120 Computing System Logic Manual, SY34-0193-0 (December 1979), contents. Hosted as IBM 5120 Computing System Logic Manual.
- ↑ IBM 5120 MIM, p. 3-59, display.
- ↑ IBM 5120 MIM, p. 3-66, "5110-3 Power Supply".
- ↑ IBM 5120 MIM, pp. 2-11 and 2-12, items 207 "AC Box" and 208 "Power Supply".
- ↑ IBM 5120 MIM, section 1, "IBM 5120 Computing System Publications".