Engineering:HP 9845

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HP 9845
File:250px
DeveloperHewlett-Packard
TypeDesktop computer
Introductory priceUS$39,500 (today $150,700)[1]
Discontinued1984 (being outcompeted by the 200 series)[2]
CPUStandard option 1xx:

2 x 16-bit (LPU,[3] PPU) 3-chip hybrid processor with BPC, IOC and EMC

Enhanced option 2xx:
1 x bit-slice processor (LPU)
1 x 16-bit hybrid (PPU)

@ 5.7 MHz[1]
Memory64 - 1600 KB RAM
128 KB ROM[1]
Graphics560 x 455 pixels @ 3 bpp (8 color)[1]
PowerProcessor: 275 W (max), CRT display: 550 W (max)[1]
Mass48.1 kg (106 lb)[1]
HP 5061-3001 16-bit 4-chip hybrid processor used as the LPU & PPU processors in the HP 9845 series computers. Contains the BPC, IOC, EMC and AEC die.

The HP 9845C, introduced in 1980, was one of the first desktop computers to be equipped with a color display and light pen for design and illustration work. It was used to create the color war room graphics in the 1983 movie WarGames.[4][5]

Features

The attached HP 98770A color display enabled the color graphics with its own CPU and separate power supply, a vector generator based on the AMD2900 bit-slice architecture, graphics memory with three planes of 32 KB each, the connection interface to the processor consists of a direct data bus attachment, and a light-pen logic.[1] 4913 colors were available.[1]

The display showed 8 soft keys on the lower end of the screen, 39 alignment controllers behind a door enabled fine tuning of color convergence.[1]

A builtin tape cartridge device with a capacity of 217 kB and transfer speed of 1440 bytes/s enabled storage of data.[1] Average access time for the unit is 6s and a rewind end to end takes 20s. The directory is stored in r/w memory to enable quick access.[6]

Graphics display speed (vectors/sec, overlapped and not clipped)
Option 1xx Option 2xx
For/Next ~95 ~145
Matrix Plot ~200 ~240
Absolute Plot ~5 000 ~5 000
Circles/s not clipped ~2 ~5

Option 200

In 1982, higher-performance versions of the 9845B and 9845C, the Option 200 models, were introduced. They replaced the NMOS microprocessor with an AMD 2900-based processor.[7] The microcode of the 2900-based processor included time-critical versions of the BASIC interpreter, speeding up BASIC programs by up to seven times.[8]

Games

There are four commercial game compilations for the HP 9845 computers, all released from Hewlett-Packard:[9][10] 9845 Computer Games Collection, 9845B Computer Games Library, Computer Games Library Vol. 1 and Monte Carlo Simulation.

See also

References

  1. ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 "The 9845C". 2012-08-29. https://www.hp9845.net/9845/hardware/9845c/. Retrieved 2013-06-30. 
  2. ↑ "HP Computer Museum". https://www.hpmuseum.net/display_item.php?hw=149. Retrieved 2013-06-30. 
  3. ↑ "The HP 9845 Assembler Project". 2010-02-21. https://www.hp9845.net/9845/projects/assembler/. Retrieved 2013-07-02. 
  4. ↑ Swartz, Jeffrey. "Making 'Wargames' computers compute required innovative programming". Mini-Micro Systems (June 1984): 135–145. https://bitsavers.org/magazines/Mini-Micro_Systems/198406_Making_Wargames.pdf. 
  5. ↑ "Screen Art: War Games". hp9845.net. https://www.hp9845.net/9845/software/screenart/wargames/. 
  6. ↑ "9845B/C CE Handbook". 2009-08-17. http://bitsavers.informatik.uni-stuttgart.de/pdf/hp/98xx/09845-90039_CEhbk_Apr84.pdf. Retrieved 2013-06-30. 
  7. ↑ "Packages and Options". High Performance Models. https://www.hp9845.net/9845/hardware/packages/#high_performance. 
  8. ↑ "The Processors". The Bit-slice Processor. https://www.hp9845.net/9845/hardware/processors/#bit_slice. 
  9. ↑ Arcade-History
  10. ↑ 9845 Games

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