HP 71B
 | |
| Other names | HP 44A (during development) |
|---|---|
| Type | Pocket computer, scientific calculator |
| Introduced | 1983 |
| Discontinued | 1989 |
| Predecessor | HP 75 |
| Successor | HP 94, HP 95LX |
| Cost | 550 USD |
| Calculator | |
| Entry mode | Algebraic |
| Display type | Dot-matrix LCD |
| CPU | |
| Processor | HP Saturn 1LF2 or HP Saturn 1LK7 |
| Frequency | 640kHz |
| Programming | |
| Interfaces | |
| Ports | 4x ROM/RAM slots, 1x card reader/ROM/RAM header, 1x HP-IL/ barcode reader module slots |
| Other | |
| Power supply | 4x AAA battery or 8VAC power supply |
The HP 71B is a pocket computer and scientific calculator produced by Hewlett Packard.
Features[edit | edit source]
Internal design[edit | edit source]
Internally, the HP 71B is divided up into two separate boards, earlier models use a ribbon cable to connect the boards, while later models use a zebra strip. The upper board contains the Saturn microprocessor, keyboard, and display. The lower board contains the power supply hardware, ROM, RAM, and expansion slots.
Upper board (1983)
Lower board (1983)
Upper board (1987)
Lower board (1987)
Programming[edit | edit source]
By default, the 71B only supports programming in the BASIC language. Additional keywords can be added to BASIC through the use of an expansion ROM module.
Support for Forth can be added through the use of the Forth/Assembler expansion ROM module.
Sample BASIC program[edit | edit source]
This is a sample program which will play a tone on the buzzer for 0.5 seconds, then increase the frequency non linearly and repeat, while displaying the frequency being played.
10 X=10
20 Y=20
30 PRINT X
40 BEEP X
50 X=X+Y
60 Y=Y+5
70 GOTO 30
Accessories[edit | edit source]
Front expansion slots[edit | edit source]
- HP 4K RAM module (HP 82420A)
- CMT RAM modules
- CMT EPROM module
- Various ROM modules by HP and others
Rear expansion slot[edit | edit source]
- HP-IL interface (HP 82401A)
- Dual HP-IL interface (HP 82402A)
- Zenwand-71 barcode reader
Card reader slot[edit | edit source]
- Magnetic card reader (HP 82400A)
- FRAM71
- HHP 71RAM/EPROM modules
- CMT RAM/EPROM modules
Gallery[edit | edit source]
External resources[edit | edit source]
- HP 71B Compendium (PDF) - A thorough listing of accessories and software available for the HP 71B