Image of a 1973 multi-mini computer database server

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SUMMARY

The discussion centers around the historical significance of the 1973 multi-mini computer database server, specifically utilizing multiple HP 2100 mini-computers, including the HP 2116 model. This system supported 160 users and featured a 10 MB hard drive for message queuing, alongside ten 80 MB disk pack drives. The conversation also highlights the use of the Wang 700 and Wang 720C systems, showcasing early programming techniques such as cassette tape loaders and memory optimization strategies.

PREREQUISITES
  • Understanding of HP 2100 mini-computers and their architecture
  • Familiarity with early programming techniques, including memory management
  • Knowledge of data storage technologies, such as disk pack drives
  • Basic comprehension of multiplexing and communication systems
NEXT STEPS
  • Research the architecture and capabilities of HP 2100 mini-computers
  • Explore programming techniques for memory optimization in early computing
  • Learn about the evolution of data storage technologies, focusing on disk pack drives
  • Investigate the history and functionality of multiplexing in communication systems
USEFUL FOR

Historians of computing, computer engineers, and enthusiasts interested in the evolution of mini-computers and early programming practices.

rcgldr
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This was an advanced system at the time (1973), my first programming job. Multiple HP 2100 mini-computers (1 is HP 2116), each computer mult-tasking, a database server for 160 users at the time I left the company. Underneath each mini-computers is a 10 MB hard drive used to queue messages between computers, and ten 80 MB disk pack type disk drives. On top is a multiplexor for dedicated telephone lines and a paper tape photo reader (600 characters per second). I couldn't find the image for the other side of the room that had more stuff.

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I remember using the Wang 700 with nixie tube display for Lab work as undergrad. Almost turned me into a Computer Geek. Happily (for me) the physics force was stronger
 
I used a Wang 720C in 1972 that had a type ball printer that could be used as a plotter since the paper feed drum could move up or down. Wrote a cassette tape loader that would load a program via a number entered by the user. To minimize memory, it used a call to the routine that would do a load and execute that would repeat until a matching number was found, then return to a load and execute, so only using 2 instruction spaces for the call and the load and execute. In high school, we had a Monrobot (drum memory) in 1967, then an IBM 1130 (conventional mini-computer) in 1968 to 1970, plus Saturday sessions at an IBM data center in Los Angeles using low end IBM 360 mainframes. I also spent some time in 1969 and 1970 at a CDC data center, mostly 3150, and got to see a 6600 in action (it had a cool vector graphics monitor), got to run a couple of programs on the 6600 when there was an open time slot.
 
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It's come to this. A bunch of old guys talking about how they used their Wangs in the old days. <sigh>
 
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