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3
votes
3answers
125 views

Why were some early computer displays circular?

I was looking at information on early computers and noticed some had what appear to be circular CRT displays, such as in the following images. Gerald J Sussman at PDP-6 and 340 Display from MIT ...
1
vote
1answer
29 views

What is meant by distributed architecture in the context of old fashioned 1960s mainframes?

Here it says the CDC 6600 had a distributed architecture. It had a distributed architecture (central scientific processor supported by ten very fast peripheral machines) Can anyone elaborate on ...
0
votes
0answers
30 views

When is a mainframe better than distributed servers, and when is it worse? [closed]

When is mainframe hardware better than distributed servers, and when is it worse? Some ideas that I have: Mainframe worse: Compute-intensive workloads Anything that parallelizes well and does not ...
0
votes
1answer
147 views

Write form on AS400 system

I need to write a form where I can get input from the user and save that data in DB2 present on my AS400 machine. RIght now, I am getting the default options provided by the mainframe like : 1. ...
0
votes
0answers
389 views

FTP file to Mainframe server copying only first record in the file

I was trying to ftp a file from a non mainframe server (windows machine) to mainfram server through ftp program. Input file is having 80 Record length with multiple rows. When I ftp the file using ...
0
votes
2answers
206 views

FTP DOS window closes always

I want to ftp a pds library(each members contents) drom mainframe to my pc. I wrote the following code: @ftp -i -s:"%~f0"&GOTO:EOF open myip myuser mypass pwd get 'hlq.2ndlq.3rdlq.4thlq(*)' ...
3
votes
0answers
173 views

What specific advantages does mainframe architecture have over pc architecture? [closed]

Large banks typically have very scalable front-office trading systems which can process hundreds or thousands of trades per second. Most of these are distributed systems running on large numbers of ...
2
votes
1answer
1k views

FTP ASCII file from Windows to Mainframe (iSeries) β€” special characters

I have a text file created on a Windows machine, the page coding used on the file is 1252 This file is then ftp'd to an iSeries machine for processing As far as I can see, it appears on the iSeries. ...
1
vote
2answers
499 views

Printing a legacy / mainframe report in Excel / VBA

I am trying to figure out a way to print a "mainframe" style report using VBA. I am attempting to open the file with Excel but it's being very problematic getting it to format and print properly and ...
4
votes
3answers
398 views

Building an improvised 'supercomputer' by connecting a number of used PCs in a LAN

I am in ongoing development of a simple but processor intensive computer program that I use for scientific research. It would be really helpful to have more processing speed. Right now I'm running Mac ...
206
votes
7answers
13k views

Purpose of a “mystery key” on an IBM PC 3270 keyboard

A colleague has just come into possession of a large number of IBM PC 3270 keyboards (don't ask!). These keyboards have a number of very interesting looking keys, but the one that most intrigued us ...
5
votes
6answers
2k views

What exactly is a mainframe and what exactly does a programmer do on that?

I have searched (googled) a lot but nothing answers me clearly. From what I get, "huge" computers with "many" CPUs running "legacy" software written in "legacy" languages are mainframes and the ...
0
votes
1answer
594 views

What are the advantages of zLinux/Linux s390 on Hercules? [closed]

I set up Debian Linux s390 port to run on Hercules on an i386 computer. I know that I can now develop apps or run apps that are ported to zLinux/s390 Linux, and perhaps also learn more about the ...