Ruminations

IP Probe: A telnet-like IP probe utility for z/tpf

tpf
tcpip
Whilst the use of telnet as a terminal emulator for remote systems is, baring a small number of niche cases, all but obsolete, it remains useful on many platforms as a quick…
Aug 16, 2023
Ian S. Worthington

Integer Safety in C/C++ on IBM z/Architecture and z/TPF or z/OS

tpf
c/c++
zSeries
gcc
That C/C++ does not guarantee the expected results from an arithmetic integer operation, nor will even notify us that something is awry, is…
Apr 23, 2023
Ian S. Worthington

TCP/IP Volumetric Presentation Using Trelliscope

statistics
r
One of my responsibilities as a z/TPF mainframe communications SME is the post-mortem investigation of network failures. Due to careful design, and a high degree of…
Apr 21, 2023
Ian S. Worthington

Notes on MADness

statistics
r
Median Absolute Deviations give your author some surprises.
Apr 19, 2023
Ian S. Worthington

Local Timezones for z/OS Applications

tpf
tcpip
wireshark
Anyone running applications under z/OS that use IBM Language Environment services and who needs customised control of timezone decoding on a per-job basis.
Nov 14, 2022
Ian Worthington

z/TPF, IP trace, Wireshark, and R: Response Times

tpf
tcpip
wireshark
r
Following on the previous article, this one will examine the use of R to examine the distribution of response times for selected TCP/IP transactions.
Oct 25, 2022
Ian Worthington

z/TPF, IP trace, Wireshark, and R

tpf
tcpip
wireshark
r
Using R to detect and display TCP/IP connections with suspicious anomalies based on pcap data pre-processed by Wireshark.
Sep 6, 2022
Ian Worthington
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