5. Costs
System costs for the PDP-7 with time-sharing are given in Table 1. Fabrication time is included as a dollar cost. Engineering and programming times shown are one half those charged against two identical systems.
Additional special-purpose experimental equipment commonly used with the system includes gain stabilizers, analog pulse derandomizers, amplifiers, pulse pileup rejection, low-noise preamplifiers, and Ge(Li) detectors.
| TABLE 1 System Costs—PDP-7 with Time-Sharing[A] | ||
| Items | Costs | Man-Months |
| CPU (8k, EAE) PDP-7, 1966 | $ 52,000 | |
| Dual microtape | 10,350 | |
| Calcomp plotter | 4,825 | |
| Calcomp interface | 200 | ½ |
| CRT controller | 2,300 | |
| Large screen CRT | 3,500 | |
| 3 small CRT's (5 in.) | 1,995 | ½ |
| Mag tape (556 BPI, 30 IPS) (with erase head) | 8,690 | |
| Mag tape interface | 200 | 4 |
| Memory protection | 2,000 | 3 |
| Direct memory multiplexer | 2,000 | 2 |
| 2 ADC's (4096-channel, 35 µsec per count) | 5,000 | - |
| ADC multiplex interface (automatic memory increment) | 2,000 | 3 |
| 8-parameter input to ADC (analog multiplexer) | 1,500 | 1 |
| 4 remote memory switch panels | 1,200 | 2 |
| Cabling to experiments | 1,500 | 1 |
| 8k external, 18-bit, 2-µsec memory | 12,000 | 3 |
| 20 | ||
| Programming | 18 | |
| $113,260 | 38 | |
| [A] The PDP-7 is no longer made. Its modern equivalent is the PDP-15. | ||
C. A SMALL SYSTEM BASED ON A PDP-8 COMPUTER
1. History and Hardware
This second example of a small computer system is also taken from experience at LRL. It was planned in February 1967 and first put into operation in the summer of 1967. Data were first taken with the aid of the system in the spring of 1968, and the system programming was completed in May 1969. The system is used extensively in experiments with the Bevatron.
