| Manufacturer: |
Monroe Division of Litton Business Systems |
| Model Number: |
1655 |
| Serial Number: |
Two Units in Museum |
| #1: |
E 915193 |
| #2: |
E 916836 |
| Date of Manufacture: |
#1: Mid 1970 |
|
#2: Late 1970 |
| Manufactured In: |
USA |
| Original Price: |
$3,250 at introduction |
| Weight: |
12 1/2 Pounds |
| Size: |
12 1/2" Wide, 12 1/2" Deep, 6" High |
| Power Requirement: |
60 Watts, 115V AC, 60Hz |
| Display Technology: |
Nixie Tube, Burroghs |
|
10 Digits Mantissa, 2 Digits Exponent. |
|
Special +/- Nixie for mantissa & exponent sign |
|
Neon indicators for Overflow & Error condition |
| Logic Technology: |
Computer Design Corp. First-Generation "HTL" LSI Chipset |
|
Chipset Fabrication by AMI |
|
Logic contained two plug-in circuit boards |
|
MOS Mask-Programmed ROM for microcode |
| Digits of Capacity: |
Internal: 14 Digits Mantissa + 2 Digits Exponent |
|
Displayed: 10 Digits Mantissa + 2 Digits Exponent |
| Decimal Modes: |
Automatic Floating Decimal |
|
Switch selectable normal or exponential notation |
|
Automatic switching from normal to exponential mode |
| Arithmetic Logic: |
Algebraic |
| Math Functions: |
Comprehensive assortment of engineering math functions |
| Constant: |
None |
| Memories: |
10 accumulator registers |
|
Registers 7, 8, and 9 are working registers |
| Programmable: |
Yes, Learn Mode (LEMP) |
|
128 Step Base Capacity |
|
Additional 128 steps optional |
|
Both units have 256 step capacity |
|
Six Level Subroutine Nesting |
|
Extensive Test & Branch Capabilities |
|
Punched Card programming allows access to low-level microcode instructions/subroutines |
| Notes: |
The Monroe 1655 was marketed by Ricoh in Japan as the Ricoh-Monroe 1655 |