Jan 24, 2015 - Install the ThinkPad Hardware Maintenance Diskette Version 1.73 or later, and restart the computer. From the main. 12 176 FRU FRU no.

HP-86B with 9121 dual diskette drive The first model of the Series 80 was the HP-85, introduced in January 1980. Wrote 'we were impressed with the performance. The graphics alone make this an attractive, albeit not inexpensive, alternate to existing small systems on the market. It is our guess that many personal computer experimenters and hackers will want this machine'. In a typewriter-style desktop case, the $3250 HP-85 contains the CPU and keyboard, with a ROM-based operating system (like the 9800 series), 16, a 5-inch screen (16 lines of 32 characters, or 256×192 ), a tape drive for cartridges (210 capacity, 650 /s transfer), and a thermal printer. Both the screen and printer display graphics in addition to text, and the printer can copy anything shown on the screen.

The chassis includes four module slots in the back for expansion which can hold memory modules, ROM extensions, or interfaces such as. All components were designed at the Hewlett-Packard Personal Computer Division in, including the processor and core chipset. Later models offered variations such as different or external displays, built-in interfaces or a rack-mountable enclosure (see table below for details). The machines were built around an HP-proprietary code-named “” running at 625 kHz (0.6 MHz, sic) and had a BASIC interpreter in ROM (32 kB). Programs could be stored on DC-100 cartridge tapes or on external disk/tape units.

Despite the comparatively low processor clock frequency, the machines were quite advanced compared to other desktop computers of the time, in particular regarding software features relevant to technical and scientific use. The standard number representation was a format with a 12-digit (decimal) and up to ±499. The interpreter supported a full set of scientific functions (, etc.) at this accuracy. The language supported two-dimensional arrays, and a ROM extension made high-level functions such as and available. For the larger HP-86 and HP-87 series, HP also offered a plug-in processor card with a separate processor.

Historical context [ ] The late 1970s saw the development of inexpensive home computers such as the Apple and TRS-80. Had developed the Apple computer with the idea of a computer that worked in BASIC when it was turned on, and offered HP rights to the Apple computer. He was turned down and was given a legal release. In an interview he did note that soon after that, the calculator division was starting an 8-bit computer project called Capricorn, and he wasn't allowed to work on that project. Ultimately, the market for desktop computing would go to personal computers with a floppy disk drive based operating system, and an industry standard Intel 8088 processor (the was announced shortly after the 80 series). 82936A drawer with three ROM modules Note: The HP-86/87 series used different ROMs (yellow labelling) from the 85/83 models (white labelling). 83/85 86/87 Function Description ID 3 3 I/O Access, serial and parallel (GPIO) interfaces 192 1 built-in Mass Storage Access ' compatible diskette/disk drives on GPIB.

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