|
Manufacturer: |
Wang Laboratories, Inc. |
|
Model Number: |
720C |
|
Serial Number: |
Three Units in Museum |
|
|
#1: 875842C (Upgraded from 720B) |
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#2: 875055-0 (Non-Operational, ROM Problem) |
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#3: 675842C (Upgraded from 700B) |
| Date of Manufacture: |
#1: Mid-1972 |
|
#2: September, 1971 |
|
#3: June, 1971 |
| Manufactured In: |
USA, Tewksbury, Massachusetts |
| Original Price: |
Base Price $7,000 [From Oct. '71 Price List] |
| Weight: |
39 Pounds |
| Size: |
20" Wide, 20 1/2" Deep, 9" High |
| Power Requirement: |
90 Watts, 115VAC, 60Hz |
| Display Technology: |
Nixie Tube, 32 tubes arranged in two rows of 16 |
| Logic Technology: |
DTL & TTL Small and Medium-Scale Integrated Circuits |
|
|
16K-bits of Magnetic Core Memory |
|
Ferrite Transformer-Based Microcode ROM |
|
| Digits of Capacity: |
12 significant digits plus sign |
|
2 digits plus sign for exponent |
|
Left-Justified, Left Entry, No trailing zero suppression |
| Decimal Modes: |
Full floating or modified scientific notation |
| Arithmetic Logic: |
Arithmetic for Addition & Subtraction |
|
(Up-Arrow) key for entering 1st operand of multiply/divide |
| Math Functions: |
Four Function, |
|
Integerize, Absolute Value, Pi Recall, |
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Square Root, Square, Reciprocal, |
|
ex, 10x, Base e and Base 10 Logarithms |
| Constant: |
Automatic on all four functions |
| Memories: |
248 Registers [As Equipped] |
|
Direct and Indirect Memory Access |
|
Four function math available on all memory registers |
| Programmable: |
Yes, Learn Mode w/conditionals, labeled branches, subroutines |
|
1,984 Steps of Program Storage |
| Peripherals: |
Built-in Cassette Tape Drive for Program/Data Storage |
|
Extensive Add-On Peripheral Options: (Prices from Oct., '71 Price List) |
|
- Model 701 Output Writer [2 Pages] [PDF] ($1,800) |
|
- Model 702 Plotting Output Writer [97K] ($3,500) |
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- Model 702P Portable Plotting Output Writer [61K] |
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- Model 703 Paper Tape Editor [PDF] ($1,350) |
|
- Model 704 Punched Card Reader [PDF] ($600) |
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- Model 705 Micro Interface [PDF] ($300) |
|
- Model 706/707 Teletype Terminal Interface [PDF] ($2,800) |
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- Model 708-1 Expansion Memory Controller ($1,500) |
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- Model 708-2 4K External Memory Expansion Module ($1,500) |
|
- Model 709 Dual Cassette Tape Drive ($2,500) |
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- Model 710-1 Fixed/Removable Disc Drive [2 Pages] [PDF] ($6,000) |
|
- Model 711 I/O Typewriter (Modified IBM Selectric I/O) [PDF] ($2,500) |
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- Model 712 Analog Flat-Bed Plotter [PDF] ($2,500) |
|
- Model 714 Mark Sense Card Reader ($450) |
|
- Model 718 Extended Program Memory (1, 2, 3 or 4K-bit capacity) |
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- Model 721 High Speed Line Printer [19K] |
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- Model 722 Alphanumeric Input Keyboard |
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- Model 723 I/O Buffer |
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- Model 727 Communications Interface |
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- Model 729 Dual Cassette Drive |
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- Model 730 Fixed/Removable Hard Disk Subsystem |
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- Model 732 Digital Flat Bed Plotter |
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- Model 733 Paper Tape Reader |
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- Model 740 Dual Flexible (8") Disk Drives |
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- Model 741 Thermal Printer |
| Performance: |
Add/Subtract: 1.7ms |
|
Multiply, Square: 12.0ms |
|
Divide, 1/x: 17.6ms |
|
Square Root: 99.0ms |
|
ex: 61.8ms |
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Loge(x): 47.2ms |
|
Core Memory Cycle Time: 5.0us |
| Other Features: |
Large library of software applications |
| Notes: |
These calculators were marketed heavily to auto dealerships for use in prparing consumer loan paperwork. Custom programs were written for use with the Model 701 Output Writer. The loan officer would enter
the principal, down payment/trade-in, interest rate, and term into the calculator, and a loan application form would be fed into the Output Writer (a Wang-modified IBM Selectric). The calculator then would figure the amortization and payment information which would be formatted and printed on the Output Writer. |
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The Soviet Union produced a 'clone' of the Wang 700-series calculator, known as the Elektronika D3-28. This machine
used similar small-scale IC technology and a Soviet-made copy of Wang's
ferrite transformer ROM. |