HP 9845B

 Home > Browse Our Collection > Computers > Hewlett Packard > HP 9845B

Although the label on the machine says HP9845B, this is in fact the expanded version HP9845T, with two cartridge drives, and a thermal printer, 192KBytes of LPU R/W memory and also graphics support.

This was the final version of the 9845 series, and appeared in HP's brochures from the end of 1979.

The 9845 series of machines were revolutionary for the time, with a monitor that attached by two upright connectors on top of the case, and bearing many similarities with the desktop micros that would appear later.

Unfortunately the monitor's screen on our one has delaminated and failed.

 The later 9845C had a colour screen, and light pen facilities for design work.

CPU Type: Opt. 100:
2 x 16-bit (LPU, PPU) 3-chip hybrid processor with BPC, IOC and EMC
Opt. 200:
1 x bit-slice processor (LPU)
1 x 16-bit hybrid (PPU)
CPU Clock Frequency: 11.4 MHz (5.7 MHz internal)
Read/Write Memory:

Opt. 001: 64 KBytes (56,080 bytes available)
Standard: 192 KBytes (188,904 bytes available)
Opt. 205: 320 KBytes (317,820 bytes available)
Opt. 206: 448 kBytes (448,700 bytes available)
Max. 1,600 kBytes (3 x 98407A)

Tape Cartridge Capacity: 217 KBytes
Tape Access: Directory, file by name
Tape Search Speed: 2,286 mm/sec (90 in./sec)
Tape Average Transfer Rate: 1,440 bytes/sec
Tape Cartridge Dimensions: 63.5 x 82.5 x 12.7 mm (2.5 x 3.25 x 0.5 in.)
Termal Line Printer Print Speed: up to 480 lines/min
Thermal Line Printer Plot Speed: Normal mode: 25.4 mm/sec (1 in./sec)
CRT transfer: 3.5 - 25 mm/sec (0.14 - 1 in./sec)
Thermal Printer Character Matrix: 5 x 7 dots (7 x 12 field)
Thermal Printer Line Width: 560 dots, 80 characters
Thermal Printer Paper Width: English: 216 mm (8.5 in.)
Metric: 210 mm (8.27 in.)
Thermal Printer Paper Type: Thermal, black or blue print, perforated or continuous roll
Thermal Printer Noise Level: 9 hr 100% duty cycle 68 dBA (max)
0.5 hr 100% duty cycle: 55 dBA (avg.)
Thermal Printer Paper Feed: Automatic load
Operating Temperature: 5°C to 40°C
Storage Temperature: -40°C to +65°C
Relative Humidity: 5% to 80% at 40°C
System Dimensions: Standard: HWD 478 x 478 x 671 mm (18.8 x 18.8 x 26.4 in.)
Opt. 2xx: HWD 546 x 482,5 x 762 mm (21.5 x 19 x 30 in.)

Manufacturer: Hewlett Packard
Date: 1980

Comment on This Page

Other Systems Related To HP 9845B:

Item Manufacturer Date
HP Visualize 8160L Hewlett Packard Unknown
HP 9830A Hewlett Packard 1972
HP 5036A Microprocessor Lab Hewlett Packard 1979
Hewlett Packard HP-85 Hewlett Packard 1980
HP 9826 Hewlett Packard March 1981
HP 9836 Hewlett Packard 1983
HP Portable Plus Hewlett Packard 1984
HP 64000 (64100A) Hewlett Packard 1984
HP 110 Hewlett Packard 1984
HP Vectra 05/20 Hewlett Packard December 1989
HP APOLLO 710 WORKSTATION - A1991A Hewlett Packard 1992
HP OmniBook 300 Hewlett Packard 1993
HP OmniBook 800CT Hewlett Packard 1996
HP OmniBook 5700 CT Hewlett Packard 1997
HP 620LX Palmtop PC Hewlett Packard 1998
HP 9000 800/ F20 Hewlett Packard 1998
HP OmniBook XE2 Hewlett Packard 1999
HP Jornada 548 Hewlett Packard 2000
HP Compaq TC1100 Hewlett Packard 2003

This exhibit has a reference ID of CH28030. Please quote this reference ID in any communication with the Centre for Computing History.


HP 9845B

Click on the Image(s) For Detail


Help support the museum by buying from the museum shop

View all items

Founding Sponsors
redgate Google ARM Real VNC Microsoft Research
Heritage Lottery Funded
Heritage Lottery Fund
Accredited Museum