website/content/museum/hewlett-packard-hp-87.md

title, categories, types, origins, years, cpus, params

title	categories	types	origins	years	cpus	params
Hewlett Packard HP-87	Computers	Professional Computer	U.S.A.	1982	'Capricorn' custom HP 8-bit CPU	name image company company_name specs tabs forum_thread photos emulators links related oc_id source HP-87 /media/museum/photos/hp_87_system_1.jpg /companies/hewlett-packard Hewlett Packard label value NAME HP-87 label value MANUFACTURER Hewlett Packard label value TYPE Professional Computer label value ORIGIN U.S.A. label value YEAR September 1982 label value END OF PRODUCTION 1984 label value BUILT IN LANGUAGE HP Basic interpreter label value KEYBOARD Full stroke 93 keys with numeric keypad and user definable keys label value CPU 'Capricorn' custom HP 8-bit CPU label value SPEED 0.625 MHz label value CO-PROCESSOR Custom HP I/O circuits label value RAM 32 KB up to 534 KB max. label value VRAM 16 KB label value ROM 48 KB label value TEXT MODES 80 chars x 16 or 24 lines (software switch) label value GRAPHIC MODES 544 x 240 dots label value COLORS Monochrome label value SOUND Tone Generator label value SIZE / WEIGHT Unknown label value I/O PORTS Four I/O Ports, HP-IB label value BUILT IN MEDIA None label value OS Built-in BASIC language. Optional CP/M O.S. Needed external FD/HD unit label value POWER SUPPLY Built-in power supply unit - 110V / 240V switchable label value PERIPHERALS Speech Synthesis module, modem\ Various extension cards: GP-IB, Serial, FDD/HDD controller, I/O routines, Parallel, BASIC extensions label value PRICE $2495, (HP-87), $2995 (HP-87XM) photos emulators links 903 title subtitle text image KEYBOARD CLOSE-UP /media/museum/photos/hp_87_keyboard_1.jpg title subtitle text image HP-IB INTERFACE This interface allowed to connect in chain up to 14 peripherals - mass storage, printers, plotters - using HP-IB or IEEE-488 protocol. /media/museum/photos/hp_87_hpib_1.jpg title subtitle text image EXPANSION CONNECTORS Mainly used for RAM/ROM expansions. /media/museum/photos/hp_87_expslots_1.jpg title subtitle text image RUNNING CP/M /media/museum/photos/hp_87_screenshot_s1.jpg title url platform text Emulator for the HP85B & HP86B/87 http://olivier.2.smet.googlepages.com/HPSERIES80 Windows Open source GNU licence title url platform text HP 86 / 87(+) emulator http://www2.akso.de/files/series_80/Emulator/ Windows title url text HP Series 80 Web Site http://www.series80.org/ Nice website dedicated to HP Series 80 computers (manuals, programs, ROMs, articles, accessories, etc.). title url text The Museum of HP Calculators http://www.hpmuseum.org/hp85.htm Some useful infos here title url text Web Wiz CAPTCHA http://www.webwizcaptcha.com Lots of further info and links on the Series 80 /museum/hewlett-packard-hp-85 /museum/hewlett-packard-hp-86 926 url date https://web.archive.org/web/20230417024943/http://www.old-computers.com/museum/computer.asp?c=926 2023-04-17

The HP-87 was the follow-on model to the HP-85 in the 'Series 80'. It was a logical development, keeping the same processor and clock speed, but with the following changes:

• Basic language extended ie long variable names added, support for larger graphical display, total 48K in ROM.
• Allows programs to address memory above 64K, through use of an extended memory controller.
• HP-87 has 32K RAM built in, and allows up to 4 extra RAM modules of either 32K, 64K or 128K ie 534K max.
• Built in HP-IB interface, together with software support for basic I/O, mass-storage and printing without additional ROMs.
• Bigger screen allowing 80 column text, with either 16 or 25 lines.
• No built in tape or printer.
• Support for multiple (up to 5) binary programs in RAM.

The HP-87 was followed by the HP-86 and HP-87XM. The HP-86 lost the internal monitor in favour of an external monitor, and lost the built in HP-IB connector in favour of a Centronics parallel printer port and two connectors for HP floppy disks.

The HP-86 also had 64K RAM while the HP-87XM included 128K RAM. The final machine in the series 80 family was the HP-86B, which went back to having a built-in HP-IB port and featured 128K of RAM.

Thanks to John Shadbolt and his site for this information